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1）吸收型：压缩空气通过多孔的吸声材料减少排气噪声。吸声材料大多使用聚氯乙烯纤维、玻璃纤维、烧结铜珠等；
2）膨胀干涉型：直径比排气孔大，主要用于消除中、低频噪声。
SMC消音器的材料
消音器材料可分为三种：烧结金属、合成树脂、金属。
烧结金属适合微型阀及先导阀的排气消声吸声材料为BC（青铜）烧结金属体
连接体材料为磷青铜.
SMC消音器AN303-N03
SMC消音器AN400-04
SMC消音器AN402-04
SMC消音器AN402-N04
SMC消音器AN403-04
SMC消音器AN500-06
SMC消音器AN500-N06
SMC消音器AN600-10
SMC消音器AN600-N10
SMC消音器AN700-12
SMC消音器AN800-14
SMC消音器AN101-N01
SMC消音器AN103-01
SMC消音器AN103-KM6
SMC消音器AN103-KM8
SMC消音器AN103-N01
SMC消音器AN103-X233
SMC消音器AN110-01
SMC消音器AN120-M3
SMC消音器AN120-M5
SMC消音器AN200-02
SMC消音器AN200-F02
SMC消音器AN200-KM10
SMC消音器AN200-KM11
SMC消音器AN200-KM8
SMC消音器AN200-N02
SMC消音器AN202-02
SMC消音器AN202-N02
SMC消音器AN203-02
SMC消音器AN203-KM8
SMC消音器AN203-N02
SMC消音器AN210-02
SMC消音器AN300-03
SMC消音器AN300-KM10
SMC消音器AN300-KM12
SMC消音器AN300-N03
SMC消音器AN302-03
SMC消音器AN303-03SMC消音器AN900-20
SMC消音器ANA1-01
SMC消音器ANA1-02
SMC消音器ANA1-03
SMC消音器ANA1-04
SMC消音器ANA1-06
SMC消音器ANA1-10
SMC消音器ANA1-12
SMC消音器ANA1-14
SMC消音器ANA1-20
SMC消音器ANA1-C08
SMC消音器ANA1-C10
SMC消音器ANA1-C12
SMC消音器ANB1-01
SMC消音器ANB1-02
SMC消音器ANB1-03
SMC消音器ANB1-04
SMC消音器ANB1-06
SMC消音器ANB1-10
SMC消音器ANB1-12
SMC消音器ANB1-C06
SMC消音器ANB1-C08
SMC消音器ANB1-C10
SMC消音器AN-WO13K007
SMC消音器2504-002
SMC消音器2504-003
SMC消音器2504-N002
SMC消音器2505-002
SMC消音器2505-003
SMC消音器2506-004
SMC消音器2507-006
SMC消音器2507-N006
SMC消音器2508-010
SMC消音器2510-002
SMC消音器2510-N002
SMC消音器2511-003