Inhibited ethylene and propylene glycol for HVAC, process and data center loops

INTERCOOL Alternative

Inhibited glycol premixes and concentrates, matched to each INTERCOOL strength by freeze point. Blended and shipped from Taylor, Texas, with a certificate of analysis on every lot.

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01

The short answer

Quick answer

INTERCOOL is Interstate Chemical's line of inhibited glycol heat-transfer fluids: NFE and OP-100 are ethylene glycol, NFP and P-300 are propylene glycol, P-323 and PG Freeze are food-grade propylene glycol, and DC-300 25% is a propylene glycol fluid for direct-to-chip cooling. Interstate's premixes are named by percent glycol by volume: P-300 40% freezes at about -6 °F. Our premixes are named by percent by weight, so match on freeze point, not on the number in the name. Our inhibitor chemistry is different and our propylene glycol is not food grade, so this is an alternative, not the same fluid.

02

What to order

The products that fit this spec, and what each one is for.

For P-300 30% or DC-300 25%

Inhibited Propylene Glycol 30/70 with OAT Inhibitor

30% propylene glycol by weight, ready-mixed with deionized water. Same 9 °F typical as P-300 30%, and colder than DC-300 25%'s 14 °F.

Freeze point: approx. -13 °C (9 °F) at 30 wt% propylene glycol · Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
For P-300 40% (-6 °F)

Inhibited Propylene Glycol 40/60 with OAT Inhibitor

40% propylene glycol by weight, at the same -6 °F typical freeze point as P-300 40%.

Freeze point: approx. -21 °C (-6 °F) at 40 wt% propylene glycol · Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
For P-300 50% (-27 °F)

Inhibited Propylene Glycol 50/50 with OAT Inhibitor

50% propylene glycol by weight, about 1 °F colder than P-300 50% at typical.

Freeze point: approx. -33 °C (-28 °F) at 50 wt% propylene glycol · Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
For OP-100 30/70 (3 °F)

Inhibited Ethylene Glycol 35/65 with OAT-908

35% ethylene glycol by weight that freezes a little colder than OP-100 30/70, so it covers the same design temperature.

Freeze point: approx. -18 °C (0 °F) typical; -17 °C (1 °F) max, at 35 wt% ethylene glycol · Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
EG concentrate, or blended to order

100% Ethylene Glycol Inhibited

Inhibited ethylene glycol concentrate for site blending with deionized water, or blended by us to the freeze point you need, such as OP-100 50%'s -34 °F.

Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
PG concentrate, or blended to order

100% Propylene Glycol Inhibited

96/4 inhibited propylene glycol concentrate for site blending, or blended by us to a freeze point such as P-300 55%'s -37 °F.

Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS

Need a different concentration? We blend to the freeze point you specify, in pails, drums and 275- or 330-gallon totes.

03

About INTERCOOL

What Interstate Chemical publishes about the fluids.

Ethylene glycolINTERCOOL NFE for standard HVAC loops; INTERCOOL OP-100 for heavy-duty service with a higher inhibitor level
Propylene glycolINTERCOOL NFP for standard HVAC loops; INTERCOOL P-300 for heavy-duty service
Food gradeINTERCOOL P-323 (USP propylene glycol) and PG Freeze are NSF HT1 registered for incidental food contact
Data centerINTERCOOL DC-300 25%: 25% propylene glycol by volume, 14 °F freeze point, fluorescent yellow-green leak-detection dye
InhibitorOrganic and inorganic inhibitors, no silicates; P-300 and OP-100 list phosphate, boron, nitrite and tolyltriazole
Grade namesPremixes are percent glycol by volume, sold from 25% to 65%

Matched by freeze point

INTERCOOL grade Glycol (their basis) Their freeze point Our match Our freeze point
OP-100 30/70 (EG)
30% by volume
3 °F
Inhibited Ethylene Glycol 35/65 with OAT-908
0 °F typical, 1 °F max (35% by weight)
OP-100 50% (EG)
50% by volume
-34 °F
Blended to order from 100% Ethylene Glycol Inhibited
Set to your freeze point; our stock 50/50 is warmer at -29 °F typical
NFE or OP-100 concentrate
Concentrate
—
100% Ethylene Glycol Inhibited
Concentrate, for site blending
DC-300 25% (PG)
25% by volume
14 °F
Inhibited Propylene Glycol 30/70 with OAT Inhibitor
9 °F typical, 10 °F max (30% by weight); our 25/75 is warmer at 15 °F typical
P-300 30%
30% by volume
9 °F
Inhibited Propylene Glycol 30/70 with OAT Inhibitor
9 °F typical, 10 °F max (30% by weight)
P-300 40%
40% by volume
-6 °F
Inhibited Propylene Glycol 40/60 with OAT Inhibitor
-6 °F typical, -5 °F max (40% by weight)
P-300 50%
50% by volume
-27 °F
Inhibited Propylene Glycol 50/50 with OAT Inhibitor
-28 °F typical, -27 °F max (50% by weight)
P-300 55%
55% by volume
-37 °F
Propylene Glycol 60% Inhibited, or blended to order
-60 °F typical, -58 °F max (60% by weight), colder than needed
NFP or P-300 concentrate
Concentrate
—
100% Propylene Glycol Inhibited
Concentrate, for site blending
P-323 or PG Freeze
USP propylene glycol, NSF HT1
Set by blend
No match: ours is not food grade
—

Source: Interstate Chemical INTERCOOL heat transfer fluids (with the INTERCOOL P-300 information package (freeze table), the DC-300 25% technical data sheet the OP-100 30/70 SDS, and Duratherm's glycol coolants page for the P-300 and OP-100 inhibitor list).

04

Side by side

INTERCOOL compared with our inhibited glycol line

Property INTERCOOL (published) Alliance inhibited glycol Comparison
Glycol
Ethylene (NFE, OP-100) or propylene (NFP, P-300, P-323, DC-300)
Ethylene or propylene glycol
Same
Forms
Concentrate and premixes, 25% to 65%
Concentrates; 20/80 to 50/50 premixes and a 60% propylene glycol; others blended to order
Same
Strength naming
Percent by volume
Percent by weight
Different
Inhibitor
Phosphate, boron, nitrite and tolyltriazole (P-300, OP-100)
Nitrite-containing hybrid organic-acid package
Different
Food grade (PG)
P-323 and PG Freeze are NSF HT1 registered
No. Not for food contact or potable water
Different
Color
Yellow (P-300, OP-100 30/70); fluorescent yellow-green (DC-300)
Undyed; green or purple leak-detection dye can be added
On request
EG at -34 °F, PG at -37 °F
OP-100 50%, P-300 55%
No stock premix at those freeze points; blended to order from concentrate
On request

Our column comes from our controlled technical data sheets and SDS. Their column comes from published sources; we do not test competitor fluids.

05

Questions

Which of your products matches INTERCOOL P-300 40%?

Our Inhibited Propylene Glycol 40/60 with OAT Inhibitor: -6 °F typical, matching the freeze point of P-300 40%. Its guaranteed maximum is -5 °F, so if your design must hold -6 °F as a limit, step up to our 50/50 or ask for a blend to order.

Why doesn't 40% mean the same thing on both labels?

INTERCOOL premixes are percent glycol by volume. Ours are percent by weight, and 40% propylene glycol by volume is about 41% by weight, so a same-numbered premix of ours can run about 1 °F warmer. Pick the strength from your coldest fluid temperature, not from the number in the name.

Do you have something for INTERCOOL DC-300 25% in a direct-to-chip loop?

Our Inhibited Propylene Glycol 25/75 freezes at about 15 °F typical, about 1 °F warmer than DC-300 25%'s 14 °F. For 14 °F or colder, use our 30/70 (9 °F) or we blend to order. DC-300 is dyed fluorescent yellow-green; ours ships undyed, and green dye can be added. Check the fluid against your cold-plate maker's specification first.

Can I use your propylene glycol in place of INTERCOOL P-323 in a food plant?

No. P-323 and PG Freeze are NSF HT1 registered for incidental food contact; ours is not food grade and is not for food contact or potable-water protection.

Can I top up an INTERCOOL system with your fluid?

No. Do not mix inhibitor chemistries. Drain, flush with deionized water and refill.

Can you add dye?

Yes. Our fluid ships undyed; green or purple leak-detection dye can be pre-mixed on request.

Quote a fill

Pricing, freight and lead time for your site

Tell us where the coolant goes, how much, and when it has to be there.

  • Priced for your volume, from pails to 330-gallon totes
  • Freight to your site from Taylor, Texas
  • Blended to the freeze point you specify, COA with every lot

Prefer to talk? (512) 365-6838

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INTERCOOL is a registered trademark of Interstate Chemical Company, Inc. Alliance Chemical is not affiliated with Interstate Chemical or its distributors, and our products are not INTERCOOL products. Comparisons use published information; confirm against the current data sheet and your system's fluid specification before switching.