Technical Submittal · Rev 3.1 · 2026-08-28

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)

36Products
9OAT 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

Concentrations are percent by volume unless the technical data sheet states percent by weight.

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.

36 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 30/70 with OAT-908 DTC / CDU TDS · SDS · Packet
Product page 		29.0 - 31.0 % v/v 4°F (-15.6°C) — 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 % v/v -3 °F (-19.4 °C) 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 % v/v -13°F (-25.0°C) — 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 % v/v -34°F (-36.7°C) — OAT-908 hybrid Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 25/75 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		25% (v/v) propylene glycol 14 °F (-10.1 °C) -1 °F (-18.4 °C) OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 30/70 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		29.0 - 31.0 % v/v -13 °C ≤ -23 °C (-10 °F) OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 35/65 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		34.0 - 36.0 % v/v 1 °F (-17.2 °C) -46 °F (-43.3 °C) OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 40/60 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		39.0 - 41.0 % v/v -21 °C ≤ -38 °C (-37 °F) OAT Industrial 1 qt – 330 gal tote
Inhibited Propylene Glycol 50/50 with OAT Inhibitor DTC / CDU TDS · SDS · Packet
Product page 		49.0 - 51.0 % v/v -33 °C ≤ -45 °C (-49 °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 		100% v/v -34 °F (-36.7 °C) max — inhibited Industrial 1 qt – 330 gal tote
100% Propylene Glycol Inhibited TDS · SDS · Packet
Product page 		95.6 Min WT% below -50 °C (-60 °F) — inhibited Industrial 1 qt – 330 gal tote
Propylene Glycol 20% Inhibited TDS · SDS · Packet
Product page 		19.0 - 21.0 % v/v 19 °F (-7.2 °C) 11 °F (-11.8 °C) inhibited Industrial 1 qt – 330 gal tote
30% Propylene Glycol Inhibited TDS · SDS · Packet
Product page 		30% v/v 8 °F (-13.3 °C) -18 °F (-27.5 °C) inhibited Industrial 1 qt – 330 gal tote
40% Propylene Glycol Inhibited TDS · SDS · Packet
Product page 		40% v/v -8 °F (-22.2 °C) < -60 °F (< -51.1 °C) inhibited Industrial 1 qt – 330 gal tote
50% Propylene Glycol Inhibited TDS · SDS · Packet
Product page 		50% v/v -31 °F (-35.0 °C) < -60 °F (< -51.1 °C) inhibited Industrial 1 qt – 330 gal tote
Propylene Glycol 60% Inhibited TDS · SDS · Packet
Product page 		59.0 - 61.0 % v/v < -60 °F (-51.1 °C) < -60 °F (< -51.1 °C) 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 		29.0 - 31.0 % 4 °F (-15.6 °C) max — none Technical 1 qt – 330 gal tote
Ethylene Glycol 50/50 Technical Grade TDS · SDS · Packet
Product page 		49.0 - 51.0 % -34 °F (-36.7 °C) max — none Technical 1 qt – 330 gal tote
Ethylene Glycol 60/40 TDS · SDS · Packet
Product page 		59.0 - 61.0 % -58 °F (-50.0 °C) max — 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
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.

9 COOLANTS
Inhibited Ethylene Glycol 30/70 with OAT-908
Test Specification Typical Method
Assay (ethylene glycol) 29.0 - 31.0 % v/v 30.0 % —
Reserve alkalinity 0.9 ml min. 4.8 —
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
Ethylene Glycol 30 ± 2 % w/w 30 % w/w —
Nitrite 720 ppm min. 810 ppm —
Electrical conductivity @ 25 °C 3000 µS/cm maximum 2400 ASTM D1125
Chloride (as Cl) 25 ppm maximum 0.3 ppm ASTM D3634
Silicates, phosphates, nitrites, borates, amines None added — < 10 ppm each 0.5 ppm ICP-OES / ion chromatography
Foaming tendency (volume / break time) 150 mL max / 5 s max Passes test ASTM D1881
Acidity as Acetic Acid 0.0015% max 0.0001 % —
Diethylene Glycol 0.015% max 0.009 %wt —
Iron (Fe) 0.037 ppm max 0.008 ppm —
Residue after evaporation 0.0016% max 0.0003% —
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

Appearance Clear to pinkish liquid (dyed) · pH 9.2 - 10.6 · Specific Gravity 1.033 - 1.043 · Density 1.04 g/mL at 20 °C · Boiling Point ~103 °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 % v/v 35.0 % —
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
Silicates, phosphates, nitrites, borates, amines None added — < 10 ppm each 0.5 ppm ICP-OES / ion chromatography
Foaming tendency (volume / break time) 150 mL max / 5 s max Passes test ASTM D1881

Appearance Clear to pinkish liquid (dyed) · pH 9-10.5 · Specific Gravity 1.048 (20 °C) · Density 8.80 · Boiling Point ~104 °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 % v/v 40.0 % —
Reserve alkalinity 1.2 ml min. 6.4 —
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
Ethylene Glycol 40 ± 2 % w/w 40 % w/w —
Nitrite 960 ppm min. 960 ppm —
Electrical conductivity @ 25 °C 3500 µS/cm maximum 2800 ASTM D1125
Chloride (as Cl) 25 ppm maximum 0.4 ppm ASTM D3634
Silicates, phosphates, nitrites, borates, amines None added — < 10 ppm each 0.5 ppm ICP-OES / ion chromatography
Foaming tendency (volume / break time) 150 mL max / 5 s max Passes test ASTM D1881
Acidity as Acetic Acid 0.002% max 0.0001 % —
Diethylene Glycol 0.02% max 0.012 %wt —
Iron (Fe) 0.046 ppm max 0.010 ppm —
Residue after evaporation 0.0021% max 0.0004% —
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

Appearance Clear to pinkish liquid (dyed) · pH 9.2 - 10.6 · Specific Gravity 1.047 - 1.057 · Density 1.055 g/mL at 20 °C · Boiling Point ~104 °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 % v/v 50.0 % —
Reserve alkalinity 1.5 ml min. 8.0 —
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
Ethylene Glycol 50 ± 2 % w/w 50 % w/w —
Freeze point (50 % v/v dilution) -34 ºF max. -36 ºF —
Nitrite 1200 ppm min. 1350 ppm —
Electrical conductivity @ 25 °C 4000 µS/cm maximum 3200 ASTM D1125
Chloride (as Cl) 25 ppm maximum 0.5 ppm ASTM D3634
Silicates, phosphates, nitrites, borates, amines None added — < 10 ppm each 0.5 ppm ICP-OES / ion chromatography
Foaming tendency (volume / break time) 150 mL max / 5 s max Passes test ASTM D1881
Acidity as Acetic Acid 0.0025% max 0.0002 % —
Diethylene Glycol 0.025% max 0.015 %wt —
Iron (Fe) 0.055 ppm max 0.012 ppm —
Residue after evaporation 0.0026% max 0.0005% —
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

Appearance Clear to pinkish liquid (dyed) · pH 9-10.5 · Specific Gravity 1.063 - 1.073 · Density 1.067 g/mL at 20 °C · Boiling Point ~107 °C · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 25/75 with OAT Inhibitor
Test Specification Typical Method
Reserve alkalinity ≥ 1.5 mL at 25 vol % propylene glycol 1.8 ASTM D1121
Composition 25% (v/v) propylene glycol with corrosion inhibitors 25% (v/v) —
Corrosion protection (multi-metal), OAT inhibitor package ASTM D8039 Passes test ASTM D8040 / ASTM D1881 where glycol content is below the 30% threshold of ASTM D8039
Propylene glycol concentration 24.0 - 26.0 % v/v 25.0 % —
Chloride (Cl) ≤ 25 ppm 0.20 ppm ASTM D3634
Silicate, phosphate, nitrite, nitrate, borate and amine content None detected (< 10 ppm each) 0.3 ppm ICP-OES / ion chromatography
Foaming tendency Volume ≤ 150 mL; break time ≤ 5 s Passes test ASTM D1881
Burst protection -1 °F (-18.4 °C) at 25 vol % propylene glycol Passes test Published reference

Appearance Clear to pinkish liquid (dyed) · pH 9-10.5 · Specific Gravity 1.02 (20 °C) · Density 1.024 g/cm³ · Boiling Point 214 °F at 25 vol % propylene glycol · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 30/70 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol concentration 29.0 - 31.0 % v/v 30.0 % —
Inhibitor loading (OAT package) 1.0–2.5 % OAT inhibitor package 1.75 % Batch charge record / ion chromatography of carboxylates
Reserve alkalinity ≥ 1.8 mL at 30 vol % propylene glycol 2.2 ASTM D1121
Chloride (Cl) ≤ 25 ppm 0.22 ppm ASTM D3634
Silicate, phosphate, nitrite, nitrate, borate and amine content None detected (< 10 ppm each) 0.3 ppm ICP-OES / ion chromatography
Foaming tendency Volume ≤ 150 mL; break time ≤ 5 s Passes test ASTM D1881
Acidity as Acetic Acid 0.0015 % max 0.0005 wt% —
Heavy Metals as Pb 1.5 ppm max 0.09 ppm —
Iron 0.31 ppm max 0.05 ppm —
Dipropylene glycol (DPG) 0.15 wt% max 0.075 wt% GC area % (ASTM E202)
ash 0.0015% max 0.0002 wt% —
Burst protection ≤ -23 °C (-10 °F) -25 °C (-13 °F) Burst test
Assay 29.0 - 31.0 % 30.0 % —

Appearance Clear to pinkish liquid (dyed) · pH 9-10.5 · Specific Gravity 1.020 - 1.030 · Density 1.024 g/mL at 20 °C · Boiling Point 216 °F at 30 vol % propylene glycol · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 35/65 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol concentration 34.0 - 36.0 % v/v 35.0 % —
Reserve alkalinity ≥ 2.1 mL at 35 vol % propylene glycol 2.5 ASTM D1121
Chloride (Cl) ≤ 25 ppm 0.24 ppm ASTM D3634
Silicate, phosphate, nitrite, nitrate, borate and amine content None detected (< 10 ppm each) 0.3 ppm ICP-OES / ion chromatography
Foaming tendency Volume ≤ 150 mL; break time ≤ 5 s Passes test ASTM D1881
Acidity as Acetic Acid 0.0018 % max 0.0005 wt% —
Heavy Metals as Pb 1.8 ppm max 0.10 ppm —
Iron 0.36 ppm max 0.06 ppm —
Dipropylene glycol (DPG) 0.17 wt% max 0.088 wt% GC area % (ASTM E202)
ash 0.0018% max 0.0003 wt% —
Burst protection -46 °F (-43.3 °C) at 35 vol % propylene glycol Passes test Published reference
Assay 34.0 - 36.0 % 35.0 % —

Appearance Clear to pinkish liquid (dyed) · pH 9-10.5 · Specific Gravity 1.024 - 1.034 · Density 1.029 g/mL at 20 °C · Boiling Point 217 °F at 35 vol % propylene glycol · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 40/60 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol concentration 39.0 - 41.0 % v/v 40.0 % —
Inhibitor loading (OAT package) 1.0–2.5 % OAT inhibitor package 1.75 % Batch charge record / ion chromatography of carboxylates
Reserve alkalinity ≥ 2.4 mL at 40 vol % propylene glycol 2.9 ASTM D1121
Chloride (Cl) ≤ 25 ppm 0.26 ppm ASTM D3634
Silicate, phosphate, nitrite, nitrate, borate and amine content None detected (< 10 ppm each) 0.3 ppm ICP-OES / ion chromatography
Foaming tendency Volume ≤ 150 mL; break time ≤ 5 s Passes test ASTM D1881
Acidity as Acetic Acid 0.002 % max 0.0006 wt% —
Heavy Metals as Pb 2 ppm max 0.11 ppm —
Iron 0.41 ppm max 0.06 ppm —
Dipropylene glycol (DPG) 0.2 wt% max 0.100 wt% GC area % (ASTM E202)
ash 0.002% max 0.0003 wt% —
Burst protection ≤ -38 °C (-37 °F) -40 °C (-40 °F) Burst test
Assay 39.0 - 41.0 % 40.0 % —

Appearance Clear to pinkish liquid (dyed) · pH 9-10.5 · Specific Gravity 1.027 - 1.037 · Density 1.033 g/mL at 20 °C · Boiling Point 219 °F at 40 vol % propylene glycol · Flash Point Not flammable (aqueous solution). Full sheet: TDS.

Inhibited Propylene Glycol 50/50 with OAT Inhibitor
Test Specification Typical Method
Propylene glycol concentration 49.0 - 51.0 % v/v 50.0 % —
Inhibitor loading (OAT package) 1.0–2.5 % OAT inhibitor package 1.75 % Batch charge record / ion chromatography of carboxylates
Reserve alkalinity ≥ 3.0 mL at 50 vol % propylene glycol 3.6 ASTM D1121
Chloride (Cl) ≤ 25 ppm 0.30 ppm ASTM D3634
Silicate, phosphate, nitrite, nitrate, borate and amine content None detected (< 10 ppm each) 0.3 ppm ICP-OES / ion chromatography
Foaming tendency Volume ≤ 150 mL; break time ≤ 5 s Passes test ASTM D1881
Acidity as Acetic Acid 0.0025 % max 0.0008 wt% —
Heavy Metals as Pb 2.5 ppm max 0.13 ppm —
Iron 0.51 ppm max 0.07 ppm —
Dipropylene glycol (DPG) 0.25 wt% max 0.125 wt% GC area % (ASTM E202)
ash 0.0025% max 0.0004 wt% —
Burst protection ≤ -45 °C (-49 °F) -47 °C (-53 °F) Burst test
Assay 49.0 - 51.0 % 50.0 % —

Appearance Clear to pinkish liquid (dyed) · pH 9-10.5 · Specific Gravity 1.035 - 1.045 · Density 1.04 g/mL at 20 °C · Boiling Point 222 °F at 50 vol % propylene glycol · 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 COA is issued per lot and ships with the first container of that lot. A sample COA is 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

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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.
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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.