New soft and heat-resistant elastomers from DuPont Engineering Polymers, Wilmington, Del., include three new grades of ETPV engineering thermoplastic vulcanizates and a new grade of Hytrel polyester elastomer. Typical applications include extruded hose and tubing, blow molded air ducts, and injection molded seals and body plugs. DuPont's ETPVs are a crosslinked ethylene-acrylic rubber in a copolyester TPE (similar to DuPont's Hytrel). 95A02HS BK001 and 95A02 NC010 have 89 Shore A hardness and are aimed at profile extrusion and blow molding. The black heat-stabilized grade (BK001) is rated heat resistant for 3000 hr at 150 C and the standard natural grade, NC010, is for less demanding requirements. Two other recent DuPont ETPV additions have hardness values of 70 and 80 Shore A. Earlier grades in the line were 60 and 90 Shore A. New Hytrel AC801 NC010 is softer than other Hytrel grades and has improved heat resistance. Nominal hardness is 80 A and the material is rated for 150 C service, about 20o C higher than most Hytrel grades. Tel: (800) 441-0575 . www.plastics.dupont.com
DuPont Engineering Polymers
PO Box 6100 Newark, DE 19714-6100
Phone (302) 733-8169 Fax (302) 733-8137
Editor PickThe Need for Generalists: Part 3
In failure analysis, there is a tendency to gravitate to a few common test protocols. But this approach can result in a mismatch of techniques to the problem.