Acrylic needle felt is a non-woven needle-punched process that uses acrylic strong fibers to stagger and evenly distribute fine fiber cloth. The surface is hot-rolled and singed to make it smooth and not easily blocked by dust. This filter material has large gaps. It has good air permeability and strong chemical resistance. It can not only filter normal temperature gas, but also filter medium temperature gas (150°C). It is also an ideal choice for filter materials for acid and alkali corrosive gas conditions.