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美国匹兹堡玻璃纤维公司最近研制出三种专门适用于片状模塑料(SMC)中的玻璃纤维粗纱。它们的牌号为Types521,Types522和Types523。这些粗纱对模压制品的加工性能以
Pittsburgh Fiberglass USA recently developed three glass fiber rovings specifically designed for use in sheet molding compounds (SMC). Their grades are Types521, Types522 and Types523. These rovings have good machinability for molded products