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The silica gel is contained in Tyvek which is a material that is made out of polyethylene fibres. The material is very strong; it is difficult to tear but can easily be cut with scissors or a knife. Water vapor can pass through Tyvek, but liquid water cannot.
The silica gel is contained in Tyvek which is a material that is made out of polyethylene fibres. The material is very strong; it is difficult to tear but can easily be cut with scissors or a knife. Water vapor can pass through Tyvek, but liquid water cannot.