Inhibited ethylene glycol for closed-loop HVAC and process systems

PROTOCOL LT Alternative

Inhibited ethylene glycol premixes and concentrate, matched to each PROTOCOL LT 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

PROTOCOL LT is an inhibited ethylene glycol heat-transfer fluid for light-duty closed loops, sold as a concentrate (LT-100) and as premixes named by percent glycol by volume: LT-40 is 40% ethylene glycol by volume and freezes at about -13 °F. Our inhibited ethylene glycol premixes are named by percent by weight, so match on freeze point, not on the number in the name. Our inhibitor chemistry is different from PROTOCOL'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 LT-40 (-13 °F)

Inhibited Ethylene Glycol 40/60, Nitrite-Free

41-44% ethylene glycol by weight, which lands at the same -13 °F typical freeze point as a 40% by volume blend.

Freeze point: approx. -25 °C (-13 °F) typical; -23 °C (-10 °F) max, at 41-44 wt% ethylene glycol (ASTM D1177) · Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
For LT-30 (3 °F)

Inhibited Ethylene Glycol 35/65 with OAT-908

35% by weight premix that freezes a little colder than LT-30, 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
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 LT-50's -36 °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 PROTOCOL LT

What Thermal Fluid Technologies publishes about the fluid.

GlycolEthylene glycol, at least 93% by volume in the LT-100 concentrate
InhibitorOrganic and inorganic inhibitors for mixed-metal systems, pH buffered
ColorBright yellow concentrate
Grade namesThe number is percent glycol by volume: LT-100 concentrate, LT-50 is 50% by volume
UseClosed-loop hydronic, process heating and cooling, ice rinks, snow melt, standby generators

Matched by freeze point

PROTOCOL grade Glycol (their basis) Their freeze point Our match Our freeze point
LT-30
30% by volume
3 °F
Inhibited Ethylene Glycol 35/65 with OAT-908
0 °F typical, 1 °F max (35% by weight)
LT-40
40% by volume
-13 °F
Inhibited Ethylene Glycol 40/60, Nitrite-Free
-13 °F typical, -10 °F max (41-44% by weight)
LT-50
50% by volume
-36 °F
Blended to order from 100% Ethylene Glycol Inhibited
Set to your freeze point
LT-100
Concentrate
—
100% Ethylene Glycol Inhibited
Concentrate, for site blending

Source: Thermal Fluid Technologies PROTOCOL LT-100 TechSpec (typical properties table).

04

Side by side

PROTOCOL LT compared with our inhibited ethylene glycol line

Property PROTOCOL LT (published) Alliance inhibited EG Comparison
Glycol
Ethylene glycol
Ethylene glycol
Same
Forms
Concentrate and premixes
Concentrate; 20/80 to 50/50 premixes with deionized water
Same
Strength naming
Percent by volume
Percent by weight (OAT premixes)
Different
Inhibitor
Organic and inorganic, mixed metal
Nitrite-containing hybrid organic-acid package (OAT-908 premixes); benzoate package (Nitrite-Free 40/60)
Different
Color
Bright yellow
Undyed; green or purple leak-detection dye can be added
On request
50% by volume premix (-36 °F)
LT-50
No stock premix; 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 PROTOCOL LT-40?

Our Inhibited Ethylene Glycol 40/60, Nitrite-Free: about -13 °F typical, matching the freeze point of LT-40. Our 40/60 with OAT-908 is 40% by weight and freezes at about -8 °F, so it is a weaker blend than LT-40.

Why doesn't 40/60 mean the same thing on both labels?

PROTOCOL grades are percent glycol by volume. Our OAT premixes are percent by weight, and 40% by volume of ethylene glycol is about 42.5% by weight. Pick the strength from your coldest fluid temperature, not from the number in the name.

Can I top up a PROTOCOL LT system with your fluid?

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

Can you match LT-50?

Yes, we blend it to order from our 100% Ethylene Glycol Inhibited concentrate to the freeze point you specify. Send the design temperature and system volume with your quote request.

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