涵盖了测试阀杆填料和评估其在特定火灾条件下性能的要求。包装可以是多种材料的组合或排列。本标准中的试验程序模拟了对阀杆填料有严格要求的情况。购买者可能希望制定更严格的要求，以满足其具体应用。

Covers the requirements for testing valve stem packing and evaluating its performance when exposed to specifically defined fire conditions. Packing may be a combination or an arrangement of more than one material. The test procedure in this standard simulates circumstances that impose severe demands on valve stem packing. Purchasers may wish to establish more stringent requirements to meet their specific applications.