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BioTherm fluids® PGX (Formerly IceClear PGX)

Glycerin Antifreeze / Heat Transfer Fluid HT1 Approved For Incidental Food Contact Applications (Uninhibited)

BioTherm Fluids® PGX is a bio-based glycerin alternative to petroleum derived propylene glycol (PG) that can be used as a cost effective formulation substitute for PG in many commercial, industrial and agricultural applications, including the following:

  • Heat Transfer Fluids
  • Freeze Conditioners
  • Coal and Ore Treatments
  • Deicing Fluids
  • Geothermal Fluids
  • Antifreeze/Coolant Formulations
  • Hydraulic Fluids
  • Dust Suppressants
  • Frost Protectant for Agricultural Products (e.g. Fruits)


BioTherm Fluids® PGX is designed to mirror as closely as possible, the properties of a 50% PG solution. It can be used as delivered or diluted to achieve required results. The chart below is supplied as a guide for diagnostic / maintenance purposes. The values are calculated values and are only approximations. Note: Glycerin dilutions of less than 40% may be subject to bacterial contamination.

IceClear PGX % (weight)
Brix Value (Refractometer)
Freeze Point F/C
Boiling Point F/C
Specific Heat @35F
ViscositycSt @68F (20C)


nsf logoBioTherm Fluids® PGX is NSF registered (HT1) which allows it to be used where there is possibility of incidental food contact. PGX is also available with a multi-metal corrosion inhibitor added as BioTherm Fluids® AF, both products are HT1 rated.


For Heavy Duty and/or Engine Related Applications, Use BioTherm Fluids A & I.

Derived from agricultural materials or bio-based processes, this environmentally friendly product is engineered to match the freezing point performance of conventional antifreeze products based on glycols, but with the following advantages:

  • Biobased / BioPreferred
  • NSF Registered (HT1)
  • Lower BOD/COD
  • No Glycols
  • No Salts
  • Readily Biodegradable
  • Non-Toxic
  • Designed for Environmentally Sensitive Applications



NSF Registered
This product is acceptable for use as a heat transfer fluid where there is possibility of incidental food contact (HT1). 

Won’t Dry Out
Due to its viscous nature and hygroscopic character, PGX will not dry out after initial application, making it effective for extended periods of time as an antifreeze and a dust suppressant.

Environmentally Friendly
biopreferred logoBioTherm Fluids® PGX is a 100% certified USDA Biobased Product as tested by ASTM D6866 through the USDA BioPreferred® Program. PGX is non-toxic, contains no salts, heavy metals or solvents, it is non-corrosive, fully biodegradable (with a lower BOD/COD than glycol), and it will not affect combustion processes. 

BioTherm Fluids® PGX has been tested to OECD 310 with results showing it is "readily biodegradable" meaning that there is unequivocal evidence that IceClear® PGX is rapidly mineralized to inorganic components and biomass. PGX also meets the definitions of "inherently biodegradable" and "ultimately biodegradable" meaning that there is a reasonable expectation that they will eventually be completely mineralized in aerobic environments.

PGX is formulated from complex carbohydrates derived from renewable resources and/or process side streams that facilitate cost-effective and not subject to the market swings of glycols.

Better Physical Properties
PGX is slightly more viscous than conventional antifreeze materials. As such, it adheres to particle surfaces and clings to transportation and conveying equipment with little run-off and settling. This prevents freezing, clumping and sticking, and keeps product moving freely.


HI96801 Refractometerglycerin freeze point testerBioTherm Fluids® PGX is a glycerin based product, DO NOT use testers designed for glycols. Freeze point range can quickly be determined by a special tester (pictured left) available from Orison or more accurately by a refractometer (Brix pictured right) - Brix Value Chart above.







Although no negative effects are expected, mixing antifreeze/coolants is not recommended due to varying freeze point depressants and corrosion inhibitor technologies (or no inhibitor in this case) which leads to difficulties determining actual freeze point protection and corrosion inhibition properties.


*Addition of TRAMFLOC® 1142 FOAM CONTROL AGENT may be beneficial for some applications. TRAMFLOC® 1142 FOAM CONTROL AGENT is a nonionic, nonsilicone, food grade defoamer. TRAMFLOC® 1142 FOAM CONTROL AGENT performs well in a wide range of pH and temperatures. All ingredients used in the manufacture of TRAMFLOC® 1142 FOAM CONTROL AGENT are either GRAS or listed in the Code of Federal Regulations: Title 21, Section 173.340. Recommended use at 1 oz/ 10 - 20 gallons of system fluid.


Downloads & links

BioTherm PGX antifreeze heat transfer fluid

PDF Downloads

Product Data Sheet


FDA Letter of Guarantee

NSF HT1 Letter


Custom blending is available to meet specific physical properties such as freeze point and/or heat transfer capabilities.



  • Clear Liquid
  • Mild/No Odor
  • pH: 7
  • Specific Gravity: 1.15
  • Freeze Point: -34 °C (-30 °F)
  • Viscosity: 11 (@ 20C cSt)
  • Conductivity: 0.45 mS


US Patents
One or more claims of US Patent No. 6,890,451 and 7,270,768.

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FREE Shipping to lower 48 states!
55 Gallon Drums and 275 and 330 Gallon Totes are only shipped to Commercial Business locations. We will not ship drums or totes until the address has been verified as a commercial business address. If you require delivery to a residential address (or farm), please call 800-460-2403.