Classification system and test methods for nonmetallic gasket materials—Part 1:Standard classification system for nonmetallic gasket materials
全国非金属矿产品及制品标准化技术委员会(SAC/TC 406)
GB/T 20671的本部分规定了非金属垫片材料的分类方法、代码定义、厚度要求和测量方法、取样、试样调节。本部分适用于以石棉、软木、纤维素及其他无机或有机材料结合各种黏结剂或浸渍剂而制成的材料，不适用于橡胶制品材料、垫片涂层材料或多层复合垫片材料，但多层复合垫片材料的面层单层材料也适用于本分类体系。
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