Inhibited propylene glycol premixes for data center cooling loops

DOWFROST LC Alternative

Inhibited propylene glycol premixes and concentrate, matched to DOWFROST LC 25 and LC 55 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

DOWFROST LC 25 and LC 55 are Dow's pre-diluted propylene glycol coolants for data center technology cooling loops and direct-to-chip liquid cooling. Dow lists LC 25 at 14 °F and LC 55 at -40 °F, but does not state on its product page whether the number in the name is by volume or by weight. Our inhibited propylene glycol premixes are named by percent by weight, so match on freeze point, not on the number in the name. Our inhibitor package contains nitrite and is different from Dow's, 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 LC 25 (14 °F)

Inhibited Propylene Glycol 30/70 with OAT Inhibitor

30% propylene glycol by weight, freezing at about 9 °F, which covers LC 25's 14 °F. Our 25/75 premix freezes at about 15 °F, slightly warmer than LC 25.

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 LC 55 (-40 °F)

Propylene Glycol 60% Inhibited

60% propylene glycol by weight, freezing at about -60 °F, colder than LC 55's -40 °F. Ask for a blend set to -40 °F if you do not want the extra glycol.

Freeze point: approx. -51 °C (-60 °F) at 60 wt% propylene glycol · Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
Concentrate, or blended to order

100% Propylene Glycol Inhibited

96/4 inhibited propylene glycol concentrate for site blending with deionized water, or blended by us to the freeze point you need.

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 LC

What Dow publishes about the fluids.

GlycolUSP/EP-grade propylene glycol, pre-diluted with water
InhibitorSpecially formulated inhibitor package; Dow does not publish its composition
ColorDyed fluorescent yellow for leak detection (LC 25)
Grade namesLC 25 and LC 55; Dow's product page gives the freeze points but not the glycol basis
UseData center technology cooling loops and direct-to-chip liquid cooling; LC 25 use range 14 °F to 194 °F

Matched by freeze point

DOWFROST grade Glycol (their basis) Their freeze point Our match Our freeze point
LC 25
Nominal 25% propylene glycol; basis not stated
14 °F
Inhibited Propylene Glycol 30/70 with OAT Inhibitor
9 °F (30% by weight)
LC 55
Nominal 55% propylene glycol; basis not stated
-40 °F
Propylene Glycol 60% Inhibited
-60 °F typical, -58 °F max (60% by weight)
LC 55, exact strength
—
-40 °F
Blended to order from 100% Propylene Glycol Inhibited
Set to your freeze point

Source: Dow DOWFROST LC 25 heat transfer fluid product page (typical properties, including the LC 55 freeze point).

04

Side by side

DOWFROST LC compared with our inhibited propylene glycol line

Property DOWFROST LC (published) Alliance inhibited PG Comparison
Glycol
Propylene glycol, USP/EP grade
Propylene glycol; our inhibited premixes are not sold as USP or food grade
Different
Inhibitor
Specially formulated package, composition not published
Nitrite-containing hybrid organic-acid package
Different
Nitrite
Not stated
Contains nitrite (not for nitrite-free specifications)
Different
LC 25 freeze point (14 °F)
14 °F
30/70 premix at 9 °F
Meets
LC 55 freeze point (-40 °F)
-40 °F
60% premix at -60 °F typical, or blended to order
Meets
Color
Fluorescent yellow
Undyed; green or purple leak-detection dye can be added
On request
Cold plate and CDU loops
Formulated for direct-to-chip cooling
Check the equipment maker's fluid specification before use
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

Which of your products matches DOWFROST LC 25?

Our Inhibited Propylene Glycol 30/70 with OAT Inhibitor, at about 9 °F against LC 25's 14 °F. Our 25/75 premix freezes at about 15 °F, which is 1 °F warmer than LC 25, so we point LC 25 users to the 30/70 or a blend made to order.

Is your propylene glycol nitrite-free?

No. Our inhibited propylene glycol contains nitrite. We do not sell a nitrite-free propylene glycol. Check your cold plate, CDU or server maker's fluid specification before using it in a direct-to-chip or CDU loop.

Can I top up a DOWFROST LC system with your fluid?

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

Why match on freeze point and not on the number in the name?

Dow's product page does not say whether LC 25 means 25% by volume or by weight. Our premixes are percent by weight. Pick the strength from your coldest fluid temperature, not from the number in the name.

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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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 published information; confirm against the current data sheet and your system's fluid specification before switching.