Chemicals & Polymers Blog

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The Benefits of HER vs. HQEE in Polyurethane Elastomers

The most commonly used chain extenders with 4,4’-diphenylmethyl diisocyanate (MDI) terminated prepolymers are 1,4-butanediol (BDO) and hydroquinone bis (2-hydroxyethyl) ether (HQEE).

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Making the CASE for Polyurethane Elastomers: Polyether Polyols vs. Polyester Polyols

CASE (Coatings, Adhesives, Sealants, and Elastomers), foam and elastic fiber applications all utilize a diverse family of polyols that includes:

  • Polytetramethylene ether glycols (PTMEG)
  • Polypropylene glycols (PPG)
  • Adipate- and phthalate-based polyesters
  • Polycaprolactone polyols
  • Polycarbonate polyols

Selecting the best polyol for specific formula can be the difference between making a high quality product or a low performance one. The key for making a proper material selection is a good understanding of the inherent characteristics of each polyol chemistry.

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