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Needle felt filter cloth are made in polyester, polypropylene, polyamide, Acrylic, nomex, glass, PPS, P84 and overlay PTFE membrane ectsNeedle felt is main material of dust bag.In bag dust collecting, the bag usually acts as the heart of bag filter. What kinds of smog that the bag filter can treat depends on the material of bag filter. At normal working temperature, the bag filter made from polyester, polypropylene fiber and other chemical fiber can be qualified. Moreover, at the situation of high working temperature, like chemical industry & coke blast-furnace, the bag filter must be made from heat-resisting material.The first: These fume and dust is conductive and inflammable so bag filter is better;The second: The cost of reducing the temperature is very high, and the space is also limited;The third: The component sulfur has acid dew point, so we have to do the treatment at high temperature.