crocheted with a variety of materials, including stainless steel wire, red copper, hot-dipped zinc-plating iron wire, polyamide fiber and f46 fiber. has good air permeation. uses: to remove the particle impurity in the mist, foam, liquid and air, by the process of distillation, absorption, evaporation and filtration. used in following industries: petroleum chemical industry metallurgy machinery pharmacy chemical fiber auto environment protection