Inhibited propylene glycol concentrate

DOWFROST HD Alternative

An inhibited propylene glycol concentrate for the same facility, chiller and primary cooling 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 HD is Dow's heavy-duty inhibited propylene glycol concentrate for HVAC and data-center facility loops. Our 100% Propylene Glycol Inhibited does the same job: about 96% propylene glycol with a 4% corrosion-inhibitor package, diluted with deionized water to the freeze point you need. The inhibitor chemistry differs (ours contains nitrite) and ours is undyed, so it is an alternative, not an identical fluid.

Data center mechanical room with insulated chilled-water piping and pumps, with Alliance Chemical IBC totes and drums of propylene glycol concentrate along the wall
02

What to order

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

Concentrate

100% Propylene Glycol Inhibited

Inhibited propylene glycol concentrate (96/4) for site blending with deionized water. Pails, drums and IBC totes.

Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
Ready-mixed

Inhibited Propylene Glycol 40/60 with OAT Inhibitor

40% propylene glycol already blended with deionized water and inhibitor, for loops where you would rather not mix on site.

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
Dilution water

Deionized Water ACS Reagent Grade

Conductivity under 1 µS/cm for diluting the concentrate; tap or softened water adds chloride and hardness that use up the inhibitor.

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 HD

What Dow and its distributors publish about the fluid.

GlycolPropylene glycol concentrate, about 94 to 96% PG plus inhibitors (distributor data)
InhibitorIndustrial corrosion-inhibitor package; Dow does not publish its composition
ColorDyed for leak detection
UseDiluted with water for HVAC, chiller and data-center facility (primary) loops

Source: Dow DOWFROST HD product page (with distributor technical summaries).

04

Side by side

DOWFROST HD compared with our 100% Propylene Glycol Inhibited

Property DOWFROST HD (published) Alliance 100% PG Inhibited Comparison
Glycol Propylene glycol Propylene glycol Same
Form Concentrate, about 94 to 96% PG Concentrate, 95.6 to 96.4% PG by weight Same
Inhibitor Industrial package, composition not published 3.6 to 4.4% nitrite-containing hybrid organic-acid package Different
Nitrite Not stated Contains nitrite (not for nitrite-free specifications) Different
Dye Dyed Undyed, clear Different
Use Dilute for facility and chiller loops Dilute for facility and chiller loops, or buy premixed Same

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

05

Questions

Is your inhibited propylene glycol the same as DOWFROST HD?

No. Both are inhibited propylene glycol concentrates for the same kinds of loops, but the inhibitor packages differ: ours is a nitrite-containing hybrid organic-acid package and it is undyed. Treat it as an alternative and confirm it against your system's fluid specification.

Can I top up a DOWFROST HD system with your product?

Do not mix inhibitor chemistries. Drain, flush with deionized water and refill when you change fluids.

Does it meet nitrite-free specifications?

No. It contains nitrite. If your equipment maker requires a nitrite-free coolant, it is not a fit.

What concentration should I dilute to?

Use the lowest concentration that covers the coldest fluid temperature plus margin; 25 to 35% is common for indoor technology loops and 40 to 50% for outdoor or freeze-exposed piping.

What sizes are available?

Quart through 5-gallon pail, 55-gallon drum and 275- or 330-gallon IBC tote, with a lot certificate of analysis.

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, DOWTHERM and DOWCAL are trademarks 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 sheets and your system's fluid specification before switching.