Inhibited propylene glycol for HVAC and chiller loops

DOWFROST Alternative

Inhibited propylene glycol premixes and concentrate for HVAC, chiller and process loops. Blended and shipped from Taylor, Texas, with a certificate of analysis on every lot.

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01

The short answer

Quick answer

DOWFROST is Dow's food-grade inhibited propylene glycol (USP-grade glycol with a phosphate inhibitor), sold as a concentrate and as 25 to 50% premixes. For HVAC, chiller and process loops that do not need a food-grade fluid, our inhibited propylene glycol premixes (30/70, 40/60, 50/50) and our 96/4 concentrate do the same job. Ours uses a nitrite-containing inhibitor and is not food grade, so it is not a fit where incidental food contact or potable-water protection is required.

Rooftop air-cooled chiller on a commercial building with chilled-water piping, with Alliance Chemical IBC totes and a pallet of drums of propylene glycol premix staged beside it
02

What to order

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

Ready-mixed 30/70

Inhibited Propylene Glycol 30/70 with OAT Inhibitor

30% propylene glycol already blended with deionized water and inhibitor, for indoor HVAC and chiller loops.

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
Ready-mixed 50/50

Inhibited Propylene Glycol 50/50 with OAT Inhibitor

50% propylene glycol premix for outdoor and freeze-exposed piping.

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
Concentrate

100% Propylene Glycol Inhibited

96/4 inhibited propylene glycol concentrate for blending on site with deionized water.

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 DOWFROST

What Dow and its distributors publish about the fluid.

GlycolUSP-grade propylene glycol, about 95.6% minimum in the concentrate (distributor data)
InhibitorPhosphate-based (dipotassium phosphate per distributor sheets)
Food gradeFormulated for food and beverage processing and potable-water protection
FormsConcentrate and premixed strengths such as 25, 30 and 50%

Source: Dow DOWFROST technical data sheet (with distributor summaries).

04

Side by side

DOWFROST compared with our inhibited propylene glycol line

Property DOWFROST (published) Alliance inhibited PG Comparison
Glycol Propylene glycol (USP grade) Propylene glycol Same
Forms Concentrate and premixes 96/4 concentrate; 20/80, 25/75, 30/70, 35/65, 40/60, 50/50 premixes Same
Inhibitor Phosphate-based Nitrite-containing hybrid organic-acid package Different
Food grade Yes No. Not for food contact or potable water Different

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

Is there a DOWFROST equivalent?

Several suppliers sell inhibited propylene glycol for HVAC and chiller loops. Ours is an alternative for non-food loops: it uses a nitrite-containing inhibitor instead of DOWFROST's phosphate package and it is not food grade.

Can I use it in a food plant or for potable water?

No. Our inhibited propylene glycol is not food grade and is not for food contact or potable-water protection.

Can I top up a DOWFROST system with your premix?

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

Which strength matches DOWFROST 30 or DOWFROST 50?

Our 30/70 premix freezes at about -13 °C (9 °F) and our 50/50 at about -33 °C (-28 °F), both at the stated weight percent. Pick the strength from your coldest fluid temperature, not from the product name.

Quote a fill

Tell us the site, the number of totes or the system volume, and the date the coolant has to be on site. We reply with pricing, freight and lead time.

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