Inhibited propylene glycol for hydronic heating, chiller and snow-melt loops

NOBURST Alternative

Inhibited propylene glycol premixes and concentrate, matched to each NOBURST grade by freeze point. Blended and shipped from Taylor, Texas, with a certificate of analysis on every lot.

See the coolant Get a tote quote

01

The short answer

Quick answer

NOBURST is Noble Company's family of propylene glycol antifreeze and heat-transfer fluids, inhibited with dipotassium phosphate. The -100 in NOBURST -100 is its burst point, not its freeze point: Noble rates it to freeze at -60 °F and burst at -100 °F. Our Propylene Glycol 60% Inhibited freezes at about -60 °F typical, and our premixes match each diluted NOBURST and RTU blend by freeze point. Our inhibitor is a nitrite-containing hybrid organic-acid package, not phosphate, 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 NOBURST -100 (-60 °F)

Propylene Glycol 60% Inhibited

60% propylene glycol by weight premix at the same -60 °F typical freeze point as NOBURST -100 and SUPER NOBURST at 75%. Our guaranteed maximum is -58 °F.

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
For RTU35, RTU40 and 50% mixes (0 to -6 °F)

Inhibited Propylene Glycol 40/60 with OAT Inhibitor

40% by weight premix at about -6 °F typical: matching the freeze point of RTU40, and colder than RTU35 and NOBURST -100 at 50%.

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 RTU30 (11 °F)

Inhibited Propylene Glycol 30/70 with OAT Inhibitor

30% by weight premix that freezes a little colder than RTU30.

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 SUPER NOBURST at 50% (-20 °F)

Inhibited Propylene Glycol 50/50 with OAT Inhibitor

50% by weight premix at about -28 °F typical. NOBURST -100 at 75% is -30 °F, about 2 °F colder than this premix, so we blend that one to order.

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, or blended to order

100% Propylene Glycol Inhibited

Inhibited propylene glycol concentrate for site blending with deionized water, or blended by us to the freeze point you need, such as -30 °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 NOBURST

What Noble Company publishes about the fluids.

GlycolVirgin propylene glycol; premixes blended with deionized water
InhibitorDipotassium phosphate, with a viscosity reduction agent; NOBURST AL uses an aluminum-safe package
Grade namesNOBURST -100 is named for its -100 °F burst point; RTU30, RTU35 and RTU40 are named for percent propylene glycol
FormsNOBURST -100, AL and the RTU blends are ready to use; SUPER NOBURST and NOBURST HD are concentrates
ColorDyed with a food-grade dye
Food contactNoble describes the ingredients as GRAS (Generally Recognized as Safe)

Matched by freeze point

NOBURST grade Their freeze point Their burst point Our closest Our freeze point Note
NOBURST -100, undiluted
-60 °F
-100 °F
Propylene Glycol 60% Inhibited
-60 °F typical, -58 °F max
Same typical; our max is 2 °F warmer
NOBURST -100 at 75%
-30 °F
-80 °F
Inhibited Propylene Glycol 50/50 with OAT Inhibitor
-28 °F typical, -27 °F max
About 2 °F warmer; blended to order from concentrate if you need -30 °F
NOBURST -100 at 50%
0 °F
-60 °F
Inhibited Propylene Glycol 40/60 with OAT Inhibitor
-6 °F typical, -5 °F max
Colder
RTU30 (30% PG)
11 °F
—
Inhibited Propylene Glycol 30/70 with OAT Inhibitor
9 °F typical, 10 °F max
Colder
RTU35 (35% PG)
0 °F
—
Inhibited Propylene Glycol 40/60 with OAT Inhibitor
-6 °F typical, -5 °F max
Colder; our 35/65 is about 2 °F, warmer than RTU35
RTU40 (40% PG)
-6 °F
—
Inhibited Propylene Glycol 40/60 with OAT Inhibitor
-6 °F typical, -5 °F max
Same typical; our max is 1 °F warmer
SUPER NOBURST at 75%
-60 °F
-100 °F
Propylene Glycol 60% Inhibited
-60 °F typical, -58 °F max
Same typical; our max is 2 °F warmer
SUPER NOBURST at 50%
-20 °F
-80 °F
Inhibited Propylene Glycol 50/50 with OAT Inhibitor
-28 °F typical, -27 °F max
Colder
SUPER NOBURST at 40%
0 °F
-60 °F
Inhibited Propylene Glycol 40/60 with OAT Inhibitor
-6 °F typical, -5 °F max
Colder
SUPER NOBURST concentrate
—
-100 °F
100% Propylene Glycol Inhibited
Concentrate
For site blending; mix by freeze point, not by Noble's dilution chart
NOBURST HD (to 325 °F)
-16 °F at 50%
-70 °F at 50%
No match
—
We publish no 325 °F rating
NOBURST AL (aluminum)
-60 °F
-100 °F
No match
—
We publish no aluminum rating for our propylene glycol

Source: Noble Company NOBURST Product Information Guide (NB082026-10, 09/26) (typical properties tables).

04

Side by side

NOBURST compared with our inhibited propylene glycol line

Property NOBURST (published) Alliance inhibited propylene glycol Comparison
Glycol
Virgin propylene glycol
Propylene glycol
Same
Forms
Ready-to-use blends and concentrates
Concentrate; 20/80 to 60% premixes with deionized water
Same
Grade naming
Burst point in °F (-100); percent PG (RTU)
Percent propylene glycol by weight, rated by freeze point
Different
Burst protection
-100 °F (NOBURST -100)
Not published; we design to freeze point
Not tested
Inhibitor
Dipotassium phosphate
Nitrite-containing hybrid organic-acid package
Different
High temperature
NOBURST HD to 325 °F
No 325 °F rating published
Does not meet
Aluminum systems
NOBURST AL
No aluminum rating published for our propylene glycol
Does not meet
Food-grade ingredients
GRAS ingredients, food-grade dye
No. Not food grade; not for food contact or potable water
Different
Color
Dyed
Undyed; green or purple leak-detection dye can be added
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

What does the -100 in NOBURST -100 mean?

It is the burst point in °F, not the freeze point and not a concentration. Noble rates NOBURST -100 to freeze at -60 °F and burst at -100 °F. Freeze point is where the first ice crystal forms; burst point is where the fluid turns solid and can split a pipe. Compare freeze point to freeze point and burst point to burst point, never one against the other.

Which of your products matches NOBURST -100?

Our Propylene Glycol 60% Inhibited: about -60 °F typical, the same freeze point as NOBURST -100, with a guaranteed maximum of -58 °F. We do not publish burst ratings; we design to freeze point.

Which of your products matches NOBURST RTU30, RTU35 or RTU40?

RTU30 (11 °F): our 30/70 at about 9 °F. RTU35 (0 °F) and RTU40 (-6 °F): our 40/60 at about -6 °F. Our 35/65 freezes at about 2 °F, which is warmer than RTU35, so we do not point RTU35 users to it.

Can I top up a NOBURST system with your fluid?

No. NOBURST uses a phosphate inhibitor and ours is a nitrite-containing organic-acid package. Do not mix inhibitor chemistries. Drain, flush with deionized water and refill.

Do you have something for NOBURST HD or NOBURST AL systems?

Not as a published rating. We publish no 325 °F rating like NOBURST HD and no aluminum rating for our propylene glycol like NOBURST AL. Send your system details with a quote request before using ours in those systems.

Is your propylene glycol food grade?

No. Noble describes NOBURST's ingredients as GRAS; ours is not food grade and is not for food contact or potable water.

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

RelatedHercules Cryo-Tek alternativeFreez-Kontr'l alternativeDOWFROST alternativeThermal Charge EG & PG alternativePROTOCOL NT alternativeDynalene PG-D, PG-A1 & EG-A1 alternativeCoolant FinderGlycol technical submittal

NOBURST and SUPER NOBURST are trademarks of Noble Company. Alliance Chemical is not affiliated with Noble Company or its distributors, and our products are not NOBURST products. Comparisons use Noble Company's published information; confirm against the current data sheet and your system's fluid specification before switching.