The general temperature of the flue gas conditions, the bag can only resistance temperature below 150 ℃, these occasions, polyester, polypropylene, acrylic, nylon and other chemical fiber can be a basic competency. As for the relatively high flue gas temperature of occasions, such as: chemical, silica (white carbon black) exhaust gas, iron blast furnace gas, cement kiln exhaust gas, calcium carbide furnace gas plant, foundry, steel plant flue gas, asphalt concrete flue gas mixing asphalt, refractory brick furnace flue gas, coking gas, such as, first, because the dust concentration in flue gas dust resistivity due to restrictions in the electrostatic precipitator for the collection, can only use the collection bag or other means; Second, as The dust concentration in flue gas temperature needs to be reduced to below 150 ℃ or higher investment restrictions sites at the scene; Third, because the dust in the flue gas containing sulfur as an element, dust flue gas with acid "dew point" only in acid flue gas dust that is, the higher the temperature above the dew point of the filter state separation and other factors, which will require a higher temperature can be tolerated for the production of chemical fiber filter.