Inhibited propylene glycol for closed-loop HVAC and process systems

PROTOCOL NT Alternative

Inhibited propylene glycol premixes and concentrate, matched to each PROTOCOL NT 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 NT is an industrial-grade, low-toxicity inhibited propylene glycol heat-transfer fluid, sold as a concentrate (NT-100) and as premixes named by percent glycol by volume: a 40% by volume blend freezes at about -6 °F. 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 chemistry is different and ours 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 NT at 25% (15 °F)

Inhibited Propylene Glycol 25/75 with OAT Inhibitor

25% propylene glycol by weight, at the same 15 °F typical freeze point as a 25% by volume NT blend.

Freeze point: approx. -10 °C (15 °F) at 25 wt% propylene glycol · Quart to 330-gallon tote · COA with every lot

See sizes and pricing TDSSDS
For NT at 30% (9 °F)

Inhibited Propylene Glycol 30/70 with OAT Inhibitor

30% propylene glycol by weight, at the same 9 °F typical freeze point as a 30% by volume NT blend.

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 NT at 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 a 40% by volume NT blend.

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 NT-50 (-28 °F)

Inhibited Propylene Glycol 50/50 with OAT Inhibitor

50% propylene glycol by weight, at the same -28 °F typical freeze point as NT-50. Also covers a 45% NT blend with room to spare.

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 NT-100, 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, such as -16 °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 NT

What Thermal Fluid Technologies publishes about the fluid.

GlycolPropylene glycol, at least 93% by volume in the NT-100 concentrate, with at least 6% inhibitors
InhibitorOrganic and inorganic inhibitors for mixed-metal systems, pH buffered
ColorBright pink
Grade namesThe number is percent glycol by volume: NT-100 concentrate, NT-50 is 50% by volume
ToxicityIndustrial grade, low toxicity, generally recognized as safe (GRAS); the maker sells a separate food-grade PROTOCOL FG
UseCommercial HVAC and refrigeration, closed-loop hydronic, geothermal heat pumps, ice rinks, standby generators

Matched by freeze point

PROTOCOL NT strength Glycol (their basis) Their freeze point Our match Our freeze point
NT at 20%
20% by volume
19 °F
Inhibited Propylene Glycol 20/80 with OAT Inhibitor
19 °F typical (20% by weight)
NT at 25%
25% by volume
15 °F
Inhibited Propylene Glycol 25/75 with OAT Inhibitor
15 °F typical, 16 °F max (25% by weight)
NT at 30%
30% by volume
9 °F
Inhibited Propylene Glycol 30/70 with OAT Inhibitor
9 °F typical, 10 °F max (30% by weight)
NT at 35%
35% by volume
2 °F
Inhibited Propylene Glycol 35/65 with OAT Inhibitor
2 °F typical, 4 °F max (35% by weight)
NT at 40%
40% by volume
-6 °F
Inhibited Propylene Glycol 40/60 with OAT Inhibitor
-6 °F typical, -5 °F max (40% by weight)
NT at 45%
45% by volume
-16 °F
Inhibited Propylene Glycol 50/50 with OAT Inhibitor, or blended to order
-28 °F typical, colder than needed; our 40/60 is warmer at -6 °F
NT-50
50% by volume
-28 °F
Inhibited Propylene Glycol 50/50 with OAT Inhibitor
-28 °F typical, -27 °F max (50% by weight)
NT-100
Concentrate
—
100% Propylene Glycol Inhibited
Concentrate, for site blending

Source: Thermal Fluid Technologies PROTOCOL NT-100 TechSpec (typical composition and freeze point by volume percent).

04

Side by side

PROTOCOL NT compared with our inhibited propylene glycol line

Property PROTOCOL NT (published) Alliance inhibited PG Comparison
Glycol
Propylene glycol
Propylene glycol
Same
Forms
Concentrate and premixes
96/4 concentrate; 20/80 to 50/50 premixes with deionized water
Same
Strength naming
Percent by volume
Percent by weight
Different
Inhibitor
Organic and inorganic, mixed metal
Nitrite-containing hybrid organic-acid package
Different
Toxicity and food use
Low toxicity, GRAS; not the maker's food-grade fluid
Not food grade. Not for food contact or potable water
Different
Color
Bright pink
Undyed; green or purple leak-detection dye can be added
On request
45% by volume premix (-16 °F)
Published strength
No stock premix at -16 °F; 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 NT-50?

Our Inhibited Propylene Glycol 50/50 with OAT Inhibitor: -28 °F typical, matching the freeze point of NT-50. Its guaranteed maximum is -27 °F, so if your design must hold -28 °F as a limit, ask for a slightly stronger blend to order.

Does 40% mean the same thing on both labels?

Not quite. PROTOCOL NT strengths are percent glycol by volume and ours are percent by weight. At the strengths in the table our typical freeze points line up with NT's published figures, but our guaranteed maximums run 1 to 2 °F warmer. Pick the strength from your coldest fluid temperature, not from the number in the name.

PROTOCOL NT is sold as non-toxic. Is yours?

Ours is not food grade and is not for food contact or potable-water protection. Use it only in closed loops where a food-grade fluid is not required.

Can I top up a PROTOCOL NT 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. PROTOCOL NT is pink; we do not match that color.

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.