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阀门胶以４０４５乙丙胶、ＴＭＴＤ促进剂、高耐磨炭黑、喷雾炭黑、癸二酸二辛酯等为主要原料合成的黑色胶片。检品用自来水清洗干净，并连续冲洗３０ｍｉｎ后放入含有２ｍｇ／Ｌ有效氯、ｐＨ为８０，硬度为１００ｍｇ／Ｌ的水中浸泡，检样的表面积与浸泡水容积比为５０ｃｍ
Valve plastic to 4045 ethylene-propylene rubber, TMTD accelerator, high wear-resistant carbon black, spray black, sebacic acid dioctyl ester as the main raw material for the synthesis of black film. Seized with tap water clean, and continuous rinse 30min into 2mg / L available chlorine, pH 8 0, the hardness of 100mg / L of water immersion, the sample surface area and soaking water volume ratio of 50cm