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Jeffcool Glycol-based coolants & ISF fluids

High-purity propylene glycol coolants and ISF (Immersion-Safe Fluid) series from Jeffcool. Trusted in data centers, laser systems, and industrial cooling loops worldwide.

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Jeffcool products
Brand Overview

Jeffcool produces premium glycol-based coolants and specialty immersion-safe fluids (ISF) for demanding thermal management applications. Their PG25 propylene glycol coolant is the industry standard for indirect liquid cooling in data centers, while the ISF series enables safe single-phase immersion cooling.

HeTone distributes the full Jeffcool product line with technical support for coolant selection, concentration optimization, and system compatibility review. We keep PG25 and ISF-series inventory in Asia for fast deployment.

Product Series

Featured product families.

PG Coolants

Pre-mixed propylene glycol coolants in multiple concentrations. Inhibited formula prevents corrosion in copper, aluminum, and steel cooling loops. Food-grade glycol base.

PG 25% / 55%

ISF Immersion Fluids

Immersion-Safe Fluids engineered for direct-contact electronics cooling. Dielectric, non-flammable, and compatible with PCB, solder, and common connector materials.

Dielectric, non-flammable

Custom Blends

Application-specific coolant formulations with tailored freeze point, biocide package, and inhibitor chemistry. Available in IBC totes and drums.

Custom formulation
In Depth

A closer look.

Industrial heating and cooling plant room running glycol coolant loops

Inhibited glycol, engineered to protect.

JEFFCOOL P150 is an inhibited propylene glycol coolant whose corrosion-inhibitor package protects copper, brass, steel, and aluminum loops, formulated for applications where toxicological and environmental considerations are critical.

  • Low-toxicity propylene glycol base
  • Inhibitor package for mixed-metal cooling loops
  • Pre-diluted formulas available from authorized distributors
JEFFCOOL P150 freezing point versus concentration curve

Concentration sets the freeze point.

Freeze protection is an engineering choice: diluting from 25 to 55 percent tunes the freeze point from about -7 C down to -40 C, which is exactly how the PG25 and PG55 grades on this page are specified.

  • Official freezing-point curves guide concentration choice
  • A 50 vol percent solution protects to about -34 C
  • Fluid analysis and reinhibiting programs keep coolant in spec
Jeffcool coolant supplied in 55 gallon drums

ISF fluids and drum supply, ready in Asia.

Alongside glycol coolants, the ISF immersion-safe series covers direct-contact electronics cooling, and HeTone keeps both lines stocked in Asia with concentration and compatibility support.

  • ISF-25 and ISF-55 for single-phase immersion cooling
  • Supplied in drums and IBC totes
  • Coolant analysis and top-up support from HeTone
Product Data

Representative product data.

Measured values from our application engineering materials. Contact us for complete datasheets and lot-specific certificates.

ISF immersion-safe fluid series

TypepHFreeze point°CFlash point°CDensitylb/US gal @15.5 °CThermal conductivityW/m·K @50 °CViscositycP @50 °CHeat capacitykJ/kg·K @50 °C
ISF-259.5 – 10.5-71008.60.501.13.9
ISF-559.5 – 10.5-401008.70.362.73.6

Values from HeTone application engineering materials, request official datasheets for design sign-off.

Applications

Where Jeffcool products are used.

Data Center 5G Networking Power Modules

Need help choosing the right Jeffcool coolant?

Send us your thermal requirements, we will recommend and validate the right material combination for your design.

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