One day there will be stories, books, and movies about this pandemic. Our kids and grandkids will watch the video clip and they read history about these years we are going through and surely will surprise how the world gets shut down and we manage to survive. There will be a photograph of
Read MoreFiltration materials There are a number of different materials are being used for instance cotton, polyester, and their blends. Some manufacturers used woven fabric or knitted fabric or some use nonwoven. Knitted fabric has stretchability gives good comfort but has poor filtration efficiency
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