Technical Submittal · Rev 3.7 · 2026-10-21

Glycol & Heat Transfer Fluids

Specifications, safety data sheets and qualification packets for every glycol and heat-transfer fluid we blend, on one page, for mechanical engineers, commissioning agents and procurement teams.

Download the full submittal (PDF)

40Products
12OAT Coolants
COAPer Lot
01

How to read this page

Four rules that keep the numbers below honest.

Specification vs. typical

Values marked specification are guaranteed limits tested on every lot and reported on the lot Certificate of Analysis. Values marked typical are representative results, not guarantees.

Concentration basis

Every blend concentration carries the basis its technical data sheet states: percent by weight (w/w) or by volume (v/v). They are not interchangeable, so compare blends by freeze point. Figures of 95% and above on neat glycols are purity assays.

Freeze point vs. burst protection

Freeze point is where ice crystals first form. Burst protection is the lower temperature down to which a closed system will not rupture: slush forms, but it does not expand enough to break pipe. Design to the freeze point.

Whose call it is

Final fluid selection, materials compatibility and loop chemistry limits are the responsibility of the system OEM and the engineer of record. Nothing on this page is an OEM approval.

02

Which fluid

The four decisions that pick a product, in the order engineers usually make them.

Ethylene glycol or propylene glycol

EG carries heat better at the same concentration and stays thinner at low temperature. PG is chosen where lower toxicity matters: food and beverage plants, facilities that require it, and many data-center technology loops. Both are supplied inhibited or uninhibited.

Concentration

Pick the lowest concentration that covers the coldest fluid temperature the loop will see, plus margin. Lower concentration means better heat transfer and lower pumping power. 25 to 35% is typical for indoor technology loops; 40 to 50% for outdoor dry coolers and freeze-exposed piping.

Inhibited or uninhibited

Closed loops with mixed metals (copper, aluminum, brass, steel) need an inhibited fluid. Uninhibited glycols are for customers who add their own inhibitor program or run once-through service.

Grade

Technical for HVAC and industrial loops. USP where the fluid may contact food or pharmaceutical process. ACS reagent and semiconductor grades where trace metals and ions are controlled.

03

Product lineup

One row per product. Every value is taken from the product’s technical data sheet; documents link to the current controlled copy.

40 PRODUCTS

Rows whose freeze point is at or below your temperature are highlighted; the rest are dimmed. Design to the freeze point, not burst protection.

A · Inhibited OAT coolants for data-center and technology loops

Pre-blended with deionized water and an organic-acid-technology (OAT) corrosion inhibitor package. Used in direct-to-chip secondary loops, rear-door heat exchangers, in-row cooler and dry-cooler circuits, and chiller loops.

Product Documents Concentration Freeze point Burst protection Inhibitor Grade Packaging
Inhibited Ethylene Glycol 20/80 with OAT-908 DTC / CDU TDS · SDS · Packet
Product page 		19.5-20.5% w/w -8 °C — OAT-908 hybrid Industrial 1 qt – 330 gal tote
Inhibited Ethylene Glycol 30/70 with OAT-908 DTC / CDU TDS · SDS · Packet
Product page 		29.0 - 31.0 % w/w approx. -14 °C (7 °F) typical; -13 °C (8 °F) max — OAT-908 hybrid Industrial 1 qt – 330 gal tote
Inhibited Ethylene Glycol 35/65 with OAT-908 DTC / CDU TDS · SDS · Packet
Product page 		34.0 - 36.0 % w/w approx. -18 °C (0 °F) typical; -17 °C (1 °F) max — OAT-908 hybrid Industrial 1 qt – 330 gal tote
Inhibited Ethylene Glycol 40/60 with OAT-908 DTC / CDU TDS · SDS · Packet
Product page 		39.0 - 41.0 % w/w approx. -22 °C (-8 °F) typical; -21 °C (-6 °F) max — OAT-908 hybrid Industrial 1 qt – 330 gal tote
Inhibited Ethylene Glycol 50/50 with OAT-908 DTC / CDU TDS · SDS · Packet
Product page 		49.0 - 51.0 % w/w approx. -34 °C (-29 °F) typical; -32.5 °C (-27 °F) max — OAT-908 hybrid Industrial 1 qt – 330 gal tote
Inhibited Ethylene Glycol 40/60, Nitrite-Free DTC / CDU TDS · SDS · Packet
Product page 		41 - 44 % w/w approx. -25 °C (-13 °F) typical; -23 °C (-10 °F) max, at 41-44 wt% ethylene glycol (ASTM D1177) — inhibited Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 20/80 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		19.5-20.5% w/w approx. -7 °C (19 °F) — OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 25/75 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		24.5 - 25.5 % w/w approx. -10 °C (15 °F) — OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 30/70 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		29.5 - 30.5 % w/w approx. -13 °C (9 °F) — OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 35/65 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		34.5 - 35.5 % w/w approx. -16 °C (2 °F) — OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 40/60 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		39.5 - 40.5 % w/w approx. -21 °C (-6 °F) — OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 50/50 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		49.5 - 50.5 % w/w approx. -33 °C (-28 °F) — OAT Industrial 1 qt – 330 gal tote

B · Inhibited concentrates and premixes

Concentrates for site blending with deionized water, and inhibited premixes for HVAC, hydronic and process loops.

Product Documents Concentration Freeze point Burst protection Inhibitor Grade Packaging
100% Ethylene Glycol Inhibited TDS · SDS · Packet
Product page 		97.8 % by volume About 9 °F (-13 °C) for the concentrate (ethylene glycol, NTP 1992); freeze point of a 50 vol % solution in water: -34 °F (-36.7 °C) max (ASTM D1177) — inhibited Industrial 1 qt – 330 gal tote
100% Propylene Glycol Inhibited TDS · SDS · Packet
Product page 		95.6 - 96.4 % w/w -76 °F (-60 °C) (propylene glycol component, NTP 1992); supercools rather than crystallizing — inhibited Industrial 1 qt – 330 gal tote
Propylene Glycol 20% Inhibited TDS · SDS · Packet
Product page 		20.0 - 21.0 % w/w approx. -7 °C (19 °F) — inhibited Industrial 1 qt – 330 gal tote
30% Propylene Glycol Inhibited TDS · SDS · Packet
Product page 		29.5 - 30.5 % w/w approx. -13 °C (9 °F) — inhibited Industrial 1 qt – 330 gal tote
40% Propylene Glycol Inhibited TDS · SDS · Packet
Product page 		39.5 - 40.5 % w/w approx. -21 °C (-6 °F) — inhibited Industrial 1 qt – 330 gal tote
50% Propylene Glycol Inhibited TDS · SDS · Packet
Product page 		49.5 - 50.5 % w/w approx. -33 °C (-28 °F) — inhibited Industrial 1 qt – 330 gal tote
Propylene Glycol 60% Inhibited TDS · SDS · Packet
Product page 		59.5 - 60.5 % w/w approx. -51 °C (-60 °F) — inhibited Industrial 1 qt – 330 gal tote
Ethylene Glycol Inhibited ACS Grade TDS · SDS · Packet
Product page 		Min. 99.9% 9 °F — inhibited ACS reagent 1 qt – 330 gal tote
Propylene Glycol Inhibited ACS Grade TDS · SDS · Packet
Product page 		>= 99.5 % -76 °F — inhibited ACS reagent 1 qt – 330 gal tote

C · Uninhibited glycols

For customers who inhibit on site or run once-through service. Technical, USP, ACS reagent and semiconductor grades.

Product Documents Concentration Freeze point Burst protection Inhibitor Grade Packaging
Ethylene Glycol 30/70 Technical Grade TDS · SDS · Packet
Product page 		30.0 - 31.0 %, by volume -16 °C — none Technical 1 qt – 330 gal tote
Ethylene Glycol 40/60 TDS · SDS · Packet
Product page 		40.0 - 41.0 %, by volume -24 °C — none Industrial 1 qt – 330 gal tote
Ethylene Glycol 50/50 Technical Grade TDS · SDS · Packet
Product page 		50.0 - 51.0 %, by volume approx. -37 °C (-35 °F) typical; -36.7 °C (-34 °F) max — none Technical 1 qt – 330 gal tote
Ethylene Glycol 60/40 TDS · SDS · Packet
Product page 		60.0 - 61.0 %, by volume approx. -50 °C (-58 °F) typical; -48 °C (-55 °F) guaranteed — none Industrial 1 qt – 330 gal tote
Ethylene Glycol ACS Grade TDS · SDS · Packet
Product page 		Min. 99.9% 9 °F — none ACS reagent 1 qt – 330 gal tote
Ethylene Glycol Semiconductor Grade TDS · SDS · Packet
Product page 		99.5 %wt, minimum 9 °F — none Semiconductor 1 qt – 330 gal tote
Propylene Glycol Technical Grade TDS · SDS · Packet
Product page 		99.50 weight % (minimum) -76 °F — none Technical 1 qt – 330 gal tote
Propylene Glycol USP Grade TDS · SDS · Packet
Product page 		not less than 99.5 percent -76 °F — none USP 1 qt – 330 gal tote
Propylene Glycol 20% Technical Grade TDS · SDS · Packet
Product page 		19.0 - 21.0 % v/v -7 °C — none Technical 1 qt – 330 gal tote
Propylene Glycol 20% USP GRADE TDS · SDS · Packet
Product page 		19.0 - 21.0 % v/v -7 °C — none USP 1 qt – 330 gal tote
30% Propylene Glycol Technical Grade TDS · SDS · Packet
Product page 		29.0 - 31.0 % v/v -13 °C — none Technical 1 qt – 330 gal tote
30% Propylene Glycol USP Grade TDS · SDS · Packet
Product page 		29.0 - 31.0 % v/v -13 °C — none USP 1 qt – 330 gal tote
Propylene Glycol 40% – Technical Grade TDS · SDS · Packet
Product page 		39.0 - 41.0 % v/v -21 °C — none Technical 1 qt – 330 gal tote
Propylene Glycol 40% – USP Grade (C3H8O2) TDS · SDS · Packet
Product page 		39.0 - 41.0 % v/v -21 °C — none USP 1 qt – 330 gal tote
50% Propylene Glycol Technical Grade TDS · SDS · Packet
Product page 		49.0 - 51.0 % v/v -33 °C — none Technical 1 qt – 330 gal tote
Propylene Glycol 50% – USP Grade (C3H8O2) TDS · SDS · Packet
Product page 		49.0 - 51.0 % v/v -33 °C — none USP 1 qt – 330 gal tote
Propylene Glycol 60% Technical Grade TDS · SDS · Packet
Product page 		59.0 - 61.0 % v/v -51 °C — none Technical 1 qt – 330 gal tote
Propylene Glycol 60% USP Grade TDS · SDS · Packet
Product page 		59.0 - 61.0 % v/v -51 °C — none USP 1 qt – 330 gal tote

D · Blend and make-up water

The deionized water we blend with, and the water specification for customer top-up.

Product Documents Concentration Freeze point Burst protection Inhibitor Grade Packaging
Deionized Water ACS Reagent Grade TDS · SDS · Packet
Product page 		— 0 °C (32 °F) — none ACS reagent 1 qt – 330 gal tote

E · Cross-reference: popular brands

Matched on freeze point, equal or colder, never on the number in the product name: many brands state glycol percent by volume, our premixes by weight. Their values are published typical figures from each maker’s data sheet; we do not test competitor fluids. Inhibitor chemistries differ: drain and flush before switching an existing loop. Trademarks belong to their owners; we are not affiliated with them.

Brand Product Glycol Strength (their basis) Their freeze point Our match Our freeze point Comparison
DOWTHERM SR-1 DOWTHERM SR-1 25% premix EG 25% v/v (about 27.1% w/w) (vol% glycol) 10 °F Inhibited EG 30/70 OAT-908 (29-31% w/w) 6.7 °F Side by side
DOWTHERM SR-1 DOWTHERM SR-1 30% premix EG 30% v/v (about 32.3% w/w) (vol% glycol) 4 °F Inhibited EG 35/65 OAT-908 (34-36% w/w) 0 °F Side by side
DOWTHERM SR-1 DOWTHERM SR-1 35% premix EG 35% v/v (about 37.5% w/w) (vol% glycol) -0.5 °F Inhibited EG 40/60 OAT-908 (39-41% w/w) -8.1 °F Side by side
DOWTHERM SR-1 DOWTHERM SR-1 40% premix EG 40% v/v (about 42.6% w/w) (vol% glycol) -12 °F Inhibited EG 40/60 Nitrite-Free (41-44% w/w) -13 °F Side by side
DOWTHERM SR-1 DOWTHERM SR-1 45% premix EG 45% v/v (about 47.7% w/w) (vol% glycol) -23 °F Inhibited EG 50/50 OAT-908 (49-51% w/w) -28.9 °F Side by side
DOWTHERM SR-1 DOWTHERM SR-1 50% premix EG 50% v/v (about 52.7% w/w) (vol% glycol) -34 °F custom blend from concentrate (100% Ethylene Glycol Inhibited) blended to order Side by side
DOWTHERM SR-1 DOWTHERM SR-1 60% premix EG 60% v/v (about 62.5% w/w) (vol% glycol) -60 °F custom blend from concentrate (100% Ethylene Glycol Inhibited) blended to order Side by side
DOWFROST DOWFROST 25 (ready-to-use) PG 25% PG (PG range per SDS) (% PG (SDS range by weight)) 14.2 °F Inhibited PG 30/70 OAT / 30% PG Inhibited (30% w/w) 9 °F Side by side
DOWFROST DOWFROST 30 (ready-to-use) PG 30% PG (% PG (SDS range by weight)) 8.4 °F Inhibited PG 35/65 OAT (34.5-35.5% w/w) 2 °F Side by side
DOWFROST DOWFROST 35 (ready-to-use) PG 35% PG (% PG (SDS range by weight)) 2.5 °F Inhibited PG 35/65 OAT (34.5-35.5% w/w) 2 °F Side by side
DOWFROST DOWFROST 40 (ready-to-use) PG 40% PG (PG 37-43%) (% PG (SDS range by weight)) -6.7 °F Inhibited PG 50/50 OAT / 50% PG Inhibited (50% w/w) -28 °F Side by side
DOWFROST DOWFROST 50 (ready-to-use) PG 50% PG (PG 48-54%) (% PG (SDS range by weight)) -28.8 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
DOWFROST HD DOWFROST HD 40% premix PG 40% v/v product (vol% of DOWFROST HD) -2.7 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
DOWFROST LC DOWFROST LC 25 (PG25, data-center TCS / direct-to-chip) PG 25% (nominal % PG (basis not stated)) 14 °F Inhibited PG 30/70 OAT / 30% PG Inhibited (30% w/w) 9 °F Side by side
DOWFROST LC DOWFROST LC 55 PG 55% (nominal % PG (basis not stated)) -40 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
Thermal Charge EG Thermal Charge EG 50/50 EG 50% v/v (vol% of concentrate) -30 °F custom blend from concentrate (100% Ethylene Glycol Inhibited) blended to order Side by side
Thermal Charge PG Thermal Charge PG 50/50 (NSF HT1) PG 50% v/v (vol% of concentrate) -30 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
PROTOCOL PROTOCOL LT-30 EG 30 (vol% glycol (LT-100 = concentrate)) 3 °F Inhibited EG 35/65 with OAT-908 0 °F Side by side
PROTOCOL PROTOCOL LT-40 EG 40 (vol% glycol (LT-100 = concentrate)) -13 °F Inhibited EG 40/60 Nitrite-Free -13 °F Side by side
PROTOCOL PROTOCOL LT-50 EG 50 (vol% glycol (LT-100 = concentrate)) -36 °F custom blend from 100% Ethylene Glycol Inhibited blended to order Side by side
Cryo-Tek Cryo-Tek -100 diluted 75% product / 25% water PG 75% of the premix (% of Cryo-Tek -100 by volume) -21 °F Inhibited PG 50/50 OAT / 50% PG Inhibited (50% w/w) -28 °F Side by side
Cryo-Tek Cryo-Tek -100 diluted 60% product / 40% water PG 60% of the premix (% of Cryo-Tek -100 by volume) 0 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
Cryo-Tek Cryo-Tek -100 diluted 50% product / 50% water PG 50% of the premix (% of Cryo-Tek -100 by volume) 10 °F Inhibited PG 30/70 OAT / 30% PG Inhibited (30% w/w) 9 °F Side by side
NOBURST NOBURST -100 (ready to use) PG premix (concentration not stated) (number = BURST protection F) -60 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
NOBURST NOBURST -100 diluted 75% PG 75% of the premix (% of product) -30 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
NOBURST NOBURST -100 diluted 50% PG 50% of the premix (% of product) 0 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
NOBURST NOBURST RTU30 PG 30% PG (% PG (basis not stated)) 11 °F Inhibited PG 30/70 OAT / 30% PG Inhibited (30% w/w) 9 °F Side by side
NOBURST NOBURST RTU35 PG 35% PG (% PG (basis not stated)) 0 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
NOBURST NOBURST RTU40 PG 40% PG (% PG (basis not stated)) -6 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
SUPER NOBURST SUPER NOBURST at 75% PG 75% (% of concentrate) -60 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
SUPER NOBURST SUPER NOBURST at 50% PG 50% (% of concentrate) -20 °F Inhibited PG 50/50 OAT / 50% PG Inhibited (50% w/w) -28 °F Side by side
SUPER NOBURST SUPER NOBURST at 40% PG 40% (% of concentrate) 0 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
NOBURST HD NOBURST HD at 50% (to 325F) PG 50% (% of concentrate) -16 °F Inhibited PG 50/50 OAT / 50% PG Inhibited (50% w/w) -28 °F Side by side
NOBURST HD NOBURST HD at 40% (to 325F) PG 40% (% of concentrate) 0 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
NOBURST AL NOBURST AL (aluminum-safe, ready to use) PG premix (none) -60 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
RhoGard RhoGard 'concentrate' (aluminum-safe) PG 61-64 wt% PG per SDS (none) -60 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
Freez-Kontr'l Freez-Kontr'l 50 (ready to use, 5 gal 4188-17) PG 50% PG (% PG) -25 °F Inhibited PG 50/50 OAT / 50% PG Inhibited (50% w/w) -28 °F Side by side
Freez-Kontr'l Freez-Kontr'l 35 (ready to use, 4188-16 / 4188-35) PG 35% PG (% PG) 2 °F Inhibited PG 35/65 OAT (34.5-35.5% w/w) 2 °F Side by side
INTERCOOL INTERCOOL P-300 30% PG 30% (% concentration (basis not stated)) 9 °F Inhibited PG 30/70 OAT / 30% PG Inhibited (30% w/w) 9 °F Side by side
INTERCOOL INTERCOOL P-300 40% PG 40% (% concentration (basis not stated)) -6 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
INTERCOOL INTERCOOL P-300 50% PG 50% (% concentration (basis not stated)) -27 °F Inhibited PG 50/50 OAT / 50% PG Inhibited (50% w/w) -28 °F Side by side
INTERCOOL INTERCOOL P-300 55% PG 55% (% concentration (basis not stated)) -37 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
RECOFREEZE PG RECOFREEZE PG 50/50 PG 50% v/v (vol%) -30 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
RECOFREEZE AL RECOFREEZE AL 50/50 (aluminum boilers) PG 50/50 (vol%) -23.8 °F Inhibited PG 50/50 OAT / 50% PG Inhibited (50% w/w) -28 °F Side by side
Antifrogen N Antifrogen N 30% EG 30% v/v (vol%) 3.2 °F Inhibited EG 35/65 OAT-908 (34-36% w/w) 0 °F Side by side
Antifrogen N Antifrogen N 40% EG 40% v/v (vol%) -13.0 °F Inhibited EG 40/60 Nitrite-Free (41-44% w/w) -13 °F Side by side
Dynalene PG-D Dynalene PG-D15 (direct-to-chip) PG 15% (nominal % USP PG) 23 °F Inhibited PG 20/80 OAT / PG 20% Inhibited (20% w/w) 19 °F Side by side
Dynalene PG-D Dynalene PG-D25 (direct-to-chip, PG25) PG 25% (nominal % USP PG) 14 °F Inhibited PG 30/70 OAT / 30% PG Inhibited (30% w/w) 9 °F Side by side
Dynalene PG-A1 Dynalene PG-A1 25% (aluminum-safe) PG 25% v/v (25.9% w/w) (vol% of PG-A1) 14 °F Inhibited PG 30/70 OAT / 30% PG Inhibited (30% w/w) 9 °F Side by side
Dynalene PG-A1 Dynalene PG-A1 30% (aluminum-safe) PG 30% v/v (31.1% w/w) (vol% of PG-A1) 8 °F Inhibited PG 35/65 OAT (34.5-35.5% w/w) 2 °F Side by side
Dynalene PG-A1 Dynalene PG-A1 35% (aluminum-safe) PG 35% v/v (36.1% w/w) (vol% of PG-A1) 1 °F Inhibited PG 40/60 OAT / 40% PG Inhibited (40% w/w) -6 °F Side by side
Dynalene PG-A1 Dynalene PG-A1 40% (aluminum-safe) PG 40% v/v (41.2% w/w) (vol% of PG-A1) -8 °F Inhibited PG 50/50 OAT / 50% PG Inhibited (50% w/w) -28 °F Side by side
Dynalene PG-A1 Dynalene PG-A1 50% (aluminum-safe) PG 50% v/v (51.2% w/w) (vol% of PG-A1) -31 °F Propylene Glycol 60% Inhibited (60% w/w) -60 °F Side by side
Dynalene EG-A1 Dynalene EG-A1 25% (aluminum-safe) EG 25% v/v (27.3% w/w) (vol% of EG-A1) 14 °F Inhibited EG 30/70 OAT-908 (29-31% w/w) 6.7 °F Side by side
Dynalene EG-A1 Dynalene EG-A1 30% (aluminum-safe) EG 30% v/v (32.6% w/w) (vol% of EG-A1) 8 °F Inhibited EG 30/70 OAT-908 (29-31% w/w) 6.7 °F Side by side
Dynalene EG-A1 Dynalene EG-A1 40% (aluminum-safe) EG 40% v/v (42.9% w/w) (vol% of EG-A1) -8 °F Inhibited EG 40/60 OAT-908 (39-41% w/w) -8.1 °F Side by side
Dynalene EG-A1 Dynalene EG-A1 50% (aluminum-safe) EG 50% v/v (53.0% w/w) (vol% of EG-A1) -31 °F custom blend from concentrate (100% Ethylene Glycol Inhibited) blended to order Side by side
04

Specification detail

The specification table from each OAT coolant’s technical data sheet. Temperature-dependent specific heat, thermal conductivity and viscosity tables are available on request.

12 COOLANTS
Inhibited Ethylene Glycol 20/80 with OAT-908

Glycol concentration 19.5-20.5% w/w (SDS Section 3). The data sheet for this blend lists properties only; no separate specification table is published.

Appearance Clear, colorless to pale liquid · pH Typically 7.0-9.0 (ASTM D1287); measured value reported on the lot Certificate of Analysis · Specific Gravity 1.026 (20 °C) · Density 1.026 g/mL at 20 °C · Boiling Point ~102 °C · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Ethylene Glycol 30/70 with OAT-908
Test Specification Typical Method
Assay (ethylene glycol) 29.0 - 31.0 % w/w 30.0 % w/w —
ASTM D1384 corrosion weight loss copper 10 max; solder 30 max; brass 10 max; steel 10 max; cast iron 10 max; aluminum 30 max mg/specimen Passes test ASTM D1384
Freeze point 8.0 °F (-13.3 °C) max 6.7 °F (-14.1 °C) ASTM D1177
Reserve alkalinity 0.9 ml min. 4.8 —
Nitrite 720 ppm min. 810 ppm —
Electrical conductivity @ 25 °C 3000 µS/cm maximum 2400 ASTM D1125
Foaming tendency (volume / break time) 150 mL max / 5 s max Passes test ASTM D1881
Sulfate (SO4) 2.2 ppm max 0.15 ppm Turbidimetric, ACS procedure
Heavy metals (as Pb) 0.31 ppm max 0.03 ppm ICP-OES / ACS heavy metals procedure
Identity (IR) passes test Passes test —
Acidity as Acetic Acid 0.0015% max 0.00009 % —
Chloride (Cl) 0.43 ppm max 0.03 ppm —
Diethylene Glycol 0.015% max 0.006 % —
Iron (Fe) 0.037 ppm max 0.006 ppm —
Residue after evaporation 0.0016% max 0.0003 % —
Composition 30 % ethylene glycol in deionized water with the OAT-908 inhibitor package, by weight Conforms By formulation; batch weights (scale ticket)

Appearance Clear, colorless to pale liquid · pH Typically 7.0-9.0 (ASTM D1287); measured value reported on the lot Certificate of Analysis · Specific Gravity 1.035 - 1.045 · Density 1.04 g/mL at 20 °C · Boiling Point ~104 °C · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Ethylene Glycol 35/65 with OAT-908
Test Specification Typical Method
Assay (ethylene glycol) 34.0 - 36.0 % w/w 35.0 % w/w —
Reserve alkalinity 1.05 ml min. 5.6 —
ASTM D1384 corrosion weight loss copper 10 max; solder 30 max; brass 10 max; steel 10 max; cast iron 10 max; aluminum 30 max mg/specimen Passes test ASTM D1384
Nitrite 840 ppm min. 945 ppm —
Electrical conductivity @ 25 °C 3200 µS/cm maximum 2600 ASTM D1125
Chloride (as Cl) 25 ppm maximum 0.35 ppm ASTM D3634
Foaming tendency (volume / break time) 150 mL max / 5 s max Passes test ASTM D1881
Acidity as Acetic Acid 0.0018% max 0.0001 % —
Diethylene Glycol 0.018% max 0.007 % —
Iron (Fe) 0.041 ppm max 0.007 ppm —
Residue after evaporation 0.0019% max 0.00035 % —
Sulfate (SO4) 2.4 ppm max 0.17 ppm Turbidimetric, ACS procedure
Heavy metals (as Pb) 0.36 ppm max 0.035 ppm ICP-OES / ACS heavy metals procedure

Appearance Clear, colorless to pale liquid · pH Typically 7.0-9.0 (ASTM D1287); measured value reported on the lot Certificate of Analysis · Specific Gravity 1.047 (20 °C) · Density 8.72 · Boiling Point ~105 °C · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Ethylene Glycol 40/60 with OAT-908
Test Specification Typical Method
Assay (ethylene glycol) 39.0 - 41.0 % w/w 40.0 % w/w —
ASTM D1384 corrosion weight loss copper 10 max; solder 30 max; brass 10 max; steel 10 max; cast iron 10 max; aluminum 30 max mg/specimen Passes test ASTM D1384
Freeze point -6.4 °F (-21.3 °C) max -8.1 °F (-22.3 °C) ASTM D1177
Reserve alkalinity 1.2 ml min. 6.4 —
Nitrite 960 ppm min. 960 ppm —
Electrical conductivity @ 25 °C 3500 µS/cm maximum 2800 ASTM D1125
Foaming tendency (volume / break time) 150 mL max / 5 s max Passes test ASTM D1881
Sulfate (SO4) 2.6 ppm max 0.2 ppm Turbidimetric, ACS procedure
Heavy metals (as Pb) 0.41 ppm max 0.04 ppm ICP-OES / ACS heavy metals procedure
Identity (IR) passes test Passes test —
Acidity as Acetic Acid 0.002% max 0.00012 % —
Chloride (Cl) 0.44 ppm max 0.04 ppm —
Diethylene Glycol 0.02% max 0.008 % —
Iron (Fe) 0.046 ppm max 0.008 ppm —
Residue after evaporation 0.0021% max 0.0004 % —
Composition 40 % ethylene glycol in deionized water with the OAT-908 inhibitor package, by weight Conforms By formulation; batch weights (scale ticket)

Appearance Clear, colorless to pale liquid · pH Typically 7.0-9.0 (ASTM D1287); measured value reported on the lot Certificate of Analysis · Specific Gravity 1.048 - 1.058 · Density 1.053 g/mL at 20 °C · Boiling Point ~106 °C · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Ethylene Glycol 50/50 with OAT-908
Test Specification Typical Method
Assay (ethylene glycol) 49.0 - 51.0 % w/w 50.0 % w/w —
ASTM D1384 corrosion weight loss copper 10 max; solder 30 max; brass 10 max; steel 10 max; cast iron 10 max; aluminum 30 max mg/specimen Passes test ASTM D1384
Freeze point -26.5 °F (-32.5 °C) max -28.9 °F (-33.8 °C) ASTM D1177
Reserve alkalinity 1.5 ml min. 8.0 —
Nitrite 1200 ppm min. 1350 ppm —
Electrical conductivity @ 25 °C 4000 µS/cm maximum 3200 ASTM D1125
Foaming tendency (volume / break time) 150 mL max / 5 s max Passes test ASTM D1881
Sulfate (SO4) 3 ppm max 0.25 ppm Turbidimetric, ACS procedure
Heavy metals (as Pb) 0.51 ppm max 0.05 ppm ICP-OES / ACS heavy metals procedure
Identity (IR) passes test Passes test —
Acidity as Acetic Acid 0.0025% max 0.00015 % —
Chloride (Cl) 0.45 ppm max 0.05 ppm —
Diethylene Glycol 0.025% max 0.01 % —
Iron (Fe) 0.055 ppm max 0.01 ppm —
Residue after evaporation 0.0026% max 0.0005 % —
Composition 50 % ethylene glycol in deionized water with the OAT-908 inhibitor package, by weight Conforms By formulation; batch weights (scale ticket)

Appearance Clear, colorless to pale liquid · pH Typically 7.0-9.0 (ASTM D1287); measured value reported on the lot Certificate of Analysis · Specific Gravity 1.060 - 1.070 · Density 1.065 g/mL at 20 °C · Boiling Point ~107 °C · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Ethylene Glycol 40/60, Nitrite-Free

Glycol concentration 41 - 44 % w/w (SDS Section 3). The data sheet for this blend lists properties only; no separate specification table is published.

Appearance Clear, colorless liquid · pH 8.0-9.5 · Specific Gravity 1.052-1.056 (20 °C) · Density ~1.050 g/mL at 25 °C · Boiling Point >= 104 °C (219 °F) · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 20/80 with OAT Inhibitor

Glycol concentration 19.5-20.5% w/w (SDS Section 3). The data sheet for this blend lists properties only; no separate specification table is published.

Appearance Clear, colorless to pale yellow liquid (not dyed) · pH Typically 7.0-9.0 (ASTM D1287); measured value reported on the lot Certificate of Analysis · Specific Gravity 1.017-1.025 (20 °C), calculated from formulation · Density approx. 1.02 g/mL (8.5 lb/gal) at 20 °C · Boiling Point approx. 101 °C (214 °F) at 760 mmHg · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 25/75 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol content 24.5 - 25.5 % w/w 25.0 % w/w Formulation; verified by refractive index (ASTM D3321) / freeze point (ASTM D1177)
Nitrite (as NO2) 600 ppm min. (calculated 1,300–2,700 ppm at the 2.0% dose) Conforms Formulation minimum (calculated from inhibitor dose)
Freeze point 16 °F (-8.9 °C) max approx. 15 °F (-10 °C) ASTM D1177
Reserve alkalinity Reported on lot COA Reported on lot COA ASTM D1121
Corrosion inhibitor package 1.8 - 2.2 % w/w (nitrite-containing hybrid organic-acid) 2.0 % w/w Formulation

Appearance Clear, colorless to pale yellow liquid, free of sediment and suspended matter · pH Reported on lot COA (typically 7.0 - 9.0) · Specific Gravity 1.022-1.030 (20 °C), calculated from formulation · Density approx. 1.02 g/mL (8.5 lb/gal) at 20 °C · Boiling Point approx. 101 °C (214 °F) at 760 mmHg · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 30/70 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol content 29.5 - 30.5 % w/w 30.0 % w/w Formulation; verified by refractive index (ASTM D3321) / freeze point (ASTM D1177)
Nitrite (as NO2) 720 ppm min. (calculated 1,300–2,700 ppm at the 2.0% dose) Conforms Formulation minimum (calculated from inhibitor dose)
Freeze point 10 °F (-12.2 °C) max approx. 9 °F (-13 °C) ASTM D1177
Reserve alkalinity Reported on lot COA Reported on lot COA ASTM D1121
Corrosion inhibitor package 1.8 - 2.2 % w/w (nitrite-containing hybrid organic-acid) 2.0 % w/w Formulation

Appearance Clear, colorless to pale yellow liquid, free of sediment and suspended matter · pH Reported on lot COA (typically 7.0 - 9.0) · Specific Gravity 1.027-1.035 (20 °C), calculated from formulation · Density approx. 1.03 g/mL (8.6 lb/gal) at 20 °C · Boiling Point approx. 102 °C (216 °F) at 760 mmHg · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 35/65 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol content 34.5 - 35.5 % w/w 35.0 % w/w Formulation; verified by refractive index (ASTM D3321) / freeze point (ASTM D1177)
Nitrite (as NO2) 840 ppm min. (calculated 1,300–2,700 ppm at the 2.0% dose) Conforms Formulation minimum (calculated from inhibitor dose)
Freeze point 4 °F (-15.6 °C) max approx. 2 °F (-16 °C) ASTM D1177
Reserve alkalinity Reported on lot COA Reported on lot COA ASTM D1121
Corrosion inhibitor package 1.8 - 2.2 % w/w (nitrite-containing hybrid organic-acid) 2.0 % w/w Formulation

Appearance Clear, colorless to pale yellow liquid, free of sediment and suspended matter · pH Reported on lot COA (typically 7.0 - 9.0) · Specific Gravity 1.031-1.039 (20 °C), calculated from formulation · Density approx. 1.03 g/mL (8.6 lb/gal) at 20 °C · Boiling Point approx. 103 °C (217 °F) at 760 mmHg · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 40/60 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol content 39.5 - 40.5 % w/w 40.0 % w/w Formulation; verified by refractive index (ASTM D3321) / freeze point (ASTM D1177)
Nitrite (as NO2) 960 ppm min. (calculated 1,300–2,700 ppm at the 2.0% dose) Conforms Formulation minimum (calculated from inhibitor dose)
Freeze point -5 °F (-20.6 °C) max approx. -6 °F (-21 °C) ASTM D1177
Reserve alkalinity Reported on lot COA Reported on lot COA ASTM D1121
Corrosion inhibitor package 1.8 - 2.2 % w/w (nitrite-containing hybrid organic-acid) 2.0 % w/w Formulation

Appearance Clear, colorless to pale yellow liquid, free of sediment and suspended matter · pH Reported on lot COA (typically 7.0 - 9.0) · Specific Gravity 1.035-1.043 (20 °C), calculated from formulation · Density approx. 1.04 g/mL (8.7 lb/gal) at 20 °C · Boiling Point approx. 104 °C (219 °F) at 760 mmHg · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 50/50 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol content 49.5 - 50.5 % w/w 50.0 % w/w Formulation; verified by refractive index (ASTM D3321) / freeze point (ASTM D1177)
Nitrite (as NO2) 1,200 ppm min. (calculated 1,300–2,700 ppm at the 2.0% dose) Conforms Formulation minimum (calculated from inhibitor dose)
Freeze point -27 °F (-32.8 °C) max approx. -28 °F (-33 °C) ASTM D1177
Reserve alkalinity Reported on lot COA Reported on lot COA ASTM D1121
Corrosion inhibitor package 1.8 - 2.2 % w/w (nitrite-containing hybrid organic-acid) 2.0 % w/w Formulation

Appearance Clear, colorless to pale yellow liquid, free of sediment and suspended matter · pH Reported on lot COA (typically 7.0 - 9.0) · Specific Gravity 1.042-1.050 (20 °C), calculated from formulation · Density approx. 1.04 g/mL (8.7 lb/gal) at 20 °C · Boiling Point approx. 106 °C (222 °F) at 760 mmHg · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

05

Corrosion protection evidence

What the inhibited products are tested against, and what the standard does and does not mean.

Inhibited products are tested against ASTM D1384 (six-metal glassware coupon test: copper, solder, brass, steel, cast iron, aluminum) and, for aluminum heat-rejecting surfaces, ASTM D4340. Results are reported against the weight-loss limits of ASTM D3306.

About ASTM D3306

ASTM D3306 is an automotive coolant standard. It is used here as the reference set of limits, not as a claim of qualification for any specific data-center system.

The coupon test report (formulation tested, concentration, laboratory, date, numeric weight loss per metal) is available on request. Where a product's exact concentration was not the one tested, we say so, and coupon testing at your concentration can be arranged.

06

Materials compatibility

What inhibited glycol coolants run with, and what to keep out of the loop.

MetalsCopper, brass, stainless 304 and 316, aluminum 3003 and 6061, mild steel, cast iron
PlasticsHDPE, polypropylene, PVC, CPVC, PVDF, PTFE
ElastomersEPDM, FKM and HNBR are the common choices in liquid-cooling equipment; confirm against the OEM's approved-materials list

Avoid

Zinc and galvanized surfaces in prolonged contact (zinc reacts with glycol coolants regardless of inhibitor), magnesium alloys, natural rubber, and mixing inhibitor chemistries: do not top up an OAT-inhibited loop with a silicate- or phosphate-inhibited fluid. Top up leaks with premix at the loop concentration; plain water is only appropriate for confirmed evaporative loss.

A project-specific materials review, listing every wetted material in your loop, is available on request.

07

Water and finished-fluid acceptance

The water we blend with, and how a lot is accepted.

We blend with deionized water meeting the specification below (from the Deionized Water technical data sheet); the same water is recommended for customer make-up. Tap, softened or reverse-osmosis-only water introduces chloride and hardness that defeat the inhibitor and attack aluminum and copper.

Parameter Specification
Conductivity at 25 °C < 1 µS/cm
Resistivity at 25 °C > 1 MΩ-cm
Silicate (as SiO₂) <= 0.01 ppm
Iron (Fe) max. 0.01 mg/Kg (ppm)
Heavy metals (as Pb) <= 0.01 ppm

Finished-fluid acceptance is by lot Certificate of Analysis: glycol concentration by refractive index, specific gravity, pH, reserve alkalinity (ASTM D1121), and freeze point, against the specification column on the product's data sheet.

08

Fill and commissioning

What we supply, and whose procedure governs.

We supply premix at the specified concentration, deionized water for flushing and make-up, and sample containers for first-fill samples. Flush, fill, air removal and filtration follow the cooling-distribution-unit or equipment manufacturer's procedure. After fill, draw a sample from the loop and compare glycol concentration, pH and reserve alkalinity to the lot COA; keep that result as the loop's baseline.

09

Operation and fluid health

What to test, how often, and when to act.

TestGlycol concentration (refractive index), pH, reserve alkalinity (ASTM D1121), conductivity, visual clarity. Metals by ICP when the loop has aluminum cold plates.
FrequencyAfter fill, at 90 days, then at least annually; more often for loops above 45 °C or with known make-up.
Act whenReserve alkalinity or pH falls below the lot COA minimum, concentration drifts from design, or conductivity rises without explanation. Re-inhibit or replace with the same product; never mix chemistries.

We read results and recommend action at no charge for fluid we supplied.

10

Quality and traceability

How a container ties back to its blend, its raw materials and its certificate.

  • Every container carries a lot number. The lot ties to the blend record, the raw-material lots (glycol, inhibitor, deionized water) and the lot Certificate of Analysis.
  • A lot-specific COA is available on request at no charge. A sample COA is also available on request.
  • Retained-sample and records-retention statement, and a Letter of Continuing Guaranty, are included in the qualification packet or available on request.
11

Controlled documents

What ships with every product, and what we prepare on request.

This page as a PDF

The whole submittal, lineup matrix, specification tables and every engineering section, as one printable document for submittal packages: Download PDF. The online page and the linked TDS and SDS control.

Per product

Technical Data Sheet (TDS) · Safety Data Sheet (SDS) · Qualification packet (zip): TDS, SDS, latest lot COA, Letter of Continuing Guaranty, SHA-256 manifest. Links are in the lineup tables above.

On request

ASTM D1384 / D4340 coupon report · Project-specific materials compatibility review · Blend water and finished-fluid acceptance specification · Storage and shelf-life statement · Temperature-dependent property tables.

12

Packaging and project logistics

Container sizes and how project fills are staged.

Quarts and gallons for samples and lab work; 5-gallon pails; 55-gallon HDPE drums; 275- and 330-gallon caged IBC totes. Blended and shipped from Taylor, Texas. Central Texas deliveries go on our own trucks; elsewhere by LTL or truckload. For project fills, staged tote deliveries matched to a commissioning schedule, single-lot programs and top-off stock can be arranged on a project basis.

13

AI & data center reading

Engineering articles from our team on coolant chemistry, loop failure modes, testing cadence and the hardware driving liquid cooling.

18 ARTICLES
The Unseen Chemistry of AI: The Definitive Guide to Data Center Coolants & Chemicals Read Guide AI GPU Cooling Revolution: Deionized Water, Ethylene Glycol & Propylene Glycol – The Ultimate Liquid Cooling Guide Read Guide GPU Thermal Density and Coolant Flow Specs: B200, GB200, and MI300 Read Guide ASHRAE TC 9.9 Thermal Guidelines for AI Data Center Cooling Read Guide Direct-to-Chip vs Immersion Cooling: Fluid Types, Chemistry, and Selection Rules Read Guide Post-Novec Immersion Fluid Alternatives in 2026 Read Guide OAT vs NOAT vs HOAT Inhibitor Chemistry for Data Center Cooling Read Guide Data Center Glycol Inhibitor Chemistry Guide | OAT vs NOAT vs HOAT Read Guide Inhibited Ethylene Glycol 30/70 with OAT-908: The Data-Center Coolant Buying Guide Read Guide Twelve Ways a Data Center Glycol Loop Goes Wrong (and How to Tell Which One You Have) Read Guide Inhibitor Depletion Lifecycle and the Case for Coolant-as-a-Service Read Guide Reserve Alkalinity Testing Cadence: ASTM D1121 for Data Center Coolant Loops Read Guide Propylene Glycol vs Ethylene Glycol for Hyperscale Data Centers: Toxicity, Liability, and Regulation Read Guide Propylene Glycol + DI Water in Thermal Systems: The Practical Guide Read Guide Advanced Data Center Cooling Chemistry Part 2: When Theory Meets Reality Read Guide Sodium Hypochlorite for Cooling Towers & AI Data Centers: Dosing, Cost & Treatment Guide Read Guide AI Hardware Prep: Low-Residue Solvents for Conformal Coatings & Sensors Read Guide The Chemistry Behind the AI Memory Boom: The Industrial Chemicals That Build Every DRAM, NAND & HBM Chip Read Guide

Data center cooling chemicals overview · Data center cooling collection

14

Frequently asked

The six questions engineers ask before they ask for a quote.

Propylene glycol or ethylene glycol for a data-center loop?
Ethylene glycol moves heat better at the same concentration and stays thinner when cold. Propylene glycol is chosen where lower toxicity matters, and many operators specify it for technology loops for that reason. Both are supplied inhibited, blended with deionized water, in the same package sizes.
Can I top up the loop with tap water?
No. Chloride and hardness in tap, softened or RO-only water defeat the inhibitor and attack aluminum and copper. Top up leaks with premix at the loop concentration. Use deionized water only for confirmed evaporative loss.
What is reserve alkalinity and why is it on the COA?
Reserve alkalinity (ASTM D1121) is the buffering capacity left in the fluid, measured by titration. It falls as the inhibitor is consumed, before pH moves. It is the earliest warning that a loop needs re-inhibiting, which is why every lot COA reports it and why we recommend testing it after fill, at 90 days and then annually.
How often should the coolant be tested?
After fill (to set the baseline), at 90 days, then at least once a year. Test more often above 45 °C or when the loop takes regular make-up. Check glycol concentration, pH, reserve alkalinity, conductivity and clarity; add metals by ICP when aluminum cold plates are in the loop.
Is inhibited glycol coolant flammable?
No. Pre-blended glycol and water coolants have no flash point and are not classified as flammable. Only the neat 100% concentrates have a flash point, and it is well above 100 °C.
Do you deliver to our site and can deliveries be staged?
Yes. We blend in Taylor, Texas and deliver on our own trucks across Central Texas; elsewhere by LTL or truckload. For project fills we can stage tote deliveries to a commissioning schedule and hold top-off stock on a project basis.
15

Request a technical submittal

Give us the loop, we return the matching product, its documents and pricing. Nothing here asks you to write a paragraph.

Goes to our sales desk. Typical reply: same business day. Or email andre@alliancechemical.com · 512-365-6838 ext 515.