Abstract
Traditionally low profile SMC parts have exhibited cracking and chipping problems throughout various production phases. Thus, molders are continually looking for "tougher" resins to eliminate these problems, with the "friendly fender" material as the ultimate performance goal. Previous attempts to manufacture this type of material have caused problems in handl ing characteristics during SMC processing, in surface appearance, and in ability to withstand oven bake cycles in paint lines.
The present paper introduces two new SMC resins which pro vide a practical approach to the "friendly fender." These resins provide tremendous increases in toughness as exhibited through flexural modulus, Izod impact, matrix crazing strain, and high speed impact. In addition, these resins provide easy SMC pro cessing, excellent surface appearance, and the ability to withstand oven bake cycles on paint lines.
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