Pambuyo poyang'anitsitsa khalidwe, PP fyuluta mbale (pachimake mbale) utenga kumatheka polypropylene, amene ali ndi kulimba amphamvu ndi kusasunthika, kuwongolera psinjika kusindikiza ntchito ndi dzimbiri kukana kwa mbale fyuluta, ndi diaphragm utenga apamwamba TPE elastomer, amene ali mkulu. ..
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