... pp BFE≥95% high elastic circular rubber welding.3.It can prevent from cutting off wee dust,absorbing ... ,such as benzene,formaldehyde and other pernicious gases.4.Used in super stores,home,airport,hospital,computer ... pp BFE≥95% high elastic circular rubber welding.3.It can prevent from cutting off wee dust, ... pp BFE≥95% high elastic circular rubber welding.3.It can prevent from cutting off wee dust, ...