为杜绝垫片材料加工制造过程中石棉粉尘引起的危害，应大力开发和应用推广不含石棉的密封垫片。
Developing, applying and expanding asbestos-free gaskets is proposed to prevent from the hazards caused by asbestos dust in production process for gaskets material.
阀杆材质是符合美国材料试验协会ASTM B 371标准抗失锌现象的硅青铜，或B 99低锌合金，不含石棉的填料，和可锻或球墨铸铁手轮。
Stems shall be of dezincification-resistant silicon bronze ASTM B 371 or low-zinc alloy B 99, non-asbestos packing and malleable or ductile iron handwheel.
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