供应PA6 CM1007 CM1017N CM2021 CM1030 CM104
供应PA66 101L 101F FR50、70G33L、70G13L
供应旭化PA66 1300S 1300G 1700S 1330G 1402H原料
供应PA66 21SPC 21X-NC 22C 22HSP 41H R533H
供应杜邦PA66 70G13L 70G13HS1-L原料