Polyurethane Composites: New Alternative to Polyester and Vinyl Ester, Trend

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PUR composites are produced with rigid thermoset resins, as opposed to elastomeric or thermoplastic polyurethane (TPU). “Composites manufactured from these PU resins have superior tensile strength, impact resistance, and abrasion resistance compared with composites based on unsaturated polyester and vinyl ester resins,”


PUR composites are also said to be attractive for their processing advantages. Cure times are much faster than for polyester spray-up—about 20 min versus 2 to 4 hr in non-automotive applications, notes Bayer’s Snyder. PUR spray processes are also much less labor-intensive than polyester spray-up, which requires rolling out the glass to remove air and ensure complete wet-out.

In automotive parts, PUR SRIM takes 30 sec to 2 min vs. 2 to 10 min for polyester and vinyl ester SMC, says Terry Seagrave, Bayer’s market channel manager for NAFTA automotive business.




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