橡胶的硬度在70-80度,请问要用哪种材料,请具体说明material must be kind of rubber with hardness of 70shorA to 80shoreA是做耳机用的,要求防水.

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橡胶的硬度在70-80度,请问要用哪种材料,请具体说明materialmustbekindofrubberwithhardnessof70shorAto80shoreA是做耳机用的,要求防水.橡胶的硬

橡胶的硬度在70-80度,请问要用哪种材料,请具体说明material must be kind of rubber with hardness of 70shorA to 80shoreA是做耳机用的,要求防水.
橡胶的硬度在70-80度,请问要用哪种材料,请具体说明
material must be kind of rubber with hardness of 70shorA to 80shoreA
是做耳机用的,要求防水.

橡胶的硬度在70-80度,请问要用哪种材料,请具体说明material must be kind of rubber with hardness of 70shorA to 80shoreA是做耳机用的,要求防水.
材料为NBR,硬度为80度