Our polyester needle punched felt has the following characters: 1.High tenacity and low elongation polyester yarn for scrim material, which enhances the breaking strength 2.Fine fiber: makes the felt more apertures with smaller opening to improve the filtration precise. 3. High quality polyester fiber: improves acid proof, alkali proof, and hydrolysis proof ability. 4. Smoother surface: makes the filtration efficiency similar with membrane felt. 5. Small running resistance: saves energy.