介绍无石棉纤维密封材料的种类、使用条件和基本性能。对某工程机械变速器操纵阀出现的渗漏油故障进行分析,对所使用无石棉密封垫片进行密封性能试验,并与其他品牌进行了综合性能对比试验。指出选择无石棉密封垫片时应综合考虑介质、使用工况及被连接件的情况,除应比较垫片的技术性能指标外,还需要考虑成本因素,使选用的密封垫片具有良好的密封性能,较长的使用寿命和适宜的价格。 Describes the types, conditions of use and basic properties of non-asbestos fiber sealing materials. The failure of leakage oil in the control valve of a construction machinery transmission was analyzed. The asbestos gasket was tested for its sealing performance and compared with other brands in comprehensive performance. It is pointed out that the choice of non - asbestos gasket should be considered when considering the medium, the conditions of use and connected parts, in addition to the technical performance of shims should be compared, but also need to consider the cost factor, the selection of the gasket has a good seal Performance, long service life and suitable price.