firestopping insulator防火绝缘工人
Through penetration firestopping mortars贯穿部阻火灰泥材
Intumescent firestopping foams膨胀阻火材
Elastomer firestopping foams弹性体阻火发泡材
Through penetration firestopping pillows贯穿部阻火包覆材