... cleaning ; Nomex / Conex Needle-punched Filter Bag with PTFE Microporous Membrane Characteristics Weight (g/sqm) 500 Customised. ... and needle-punched technics ;The surface hot-setted with PTFE microporous membrane , better to resist high temperature and ... introduction filter material is widely used in the iron and steel industry , metallurgy , electricity , waste incineration , asphalt , petroleum , ...