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PureTemp Phase Change Material

PureTemp phase change materials are designed to absorb and release large quantities of thermal energy at specific temperatures. Twenty-three PureTemp PCMs have been designated as 100 percent biobased by the U.S. Department of Agriculture’s BioPreferred program. Our proprietary formulations and patented manufacturing processes yield superior results at cost-effective prices. See technical details on each PureTemp product.

Key properties include:

  • Heat energy storage capacities that average 200 J/g
  • Over 200 unique phase change transition temperatures between -40° C and 151° C
  • Consistent, repeatable performance over thousands of thermal (melt/solidify) cycles
  • 100% renewable
  • Produced from agricultural sources, not petroleum
  • Readily biodegradable and nontoxic

PureTemp Coated Fabrics

PureTemp-treated fabrics provide an effective buffer against ambient temperature swings. In consumer products such as jackets, pillows and gloves, the PCM-enhanced fabrics interact continuously with the unique microclimate of the human body, storing and releasing heat to balance body temperature and increase comfort in any climate, any time. Our material, derived from sustainable sources such as plant oil, is nontoxic and biodegradable.


The process of coating small amounts of phase change material, from 10 to 1000 microns, is called microencapsulation.

The three basic forms:

  • Powder: Particles of PCM are encased within a shell and immersed in a water solution. The water is then removed, leaving a powder of encapsulated PCM.
  • Cake: Particles of PCM are encased within a shell and then immersed in a water solution. Most of the water is removed, leaving a cake that is 30% water and 70% solids.
  • Slurry: Particles of PCM are encased within a shell and then immersed in a water solution. Some water is removed, leaving a slurry that is about 60% water and 40% solids.

Microencapsulated PCMs are sold to manufacturers for use in high-performance textiles, adhesives, bedding, flooring, paint, roofing and electronics. Contact one of our containment partners, Encapsys or Microtek Laboratories, for information on microencapsulated PureTemp.