P84 Felt High quality and prety competitive price P84 FeltP84 (polyimide) has good physical and chemical characteristics under high temperature. Made of P84 fibers, P84 needle felt is ideal for gas filtration applications, especially refuse incinerator.Temperature resistant: 260 ~ 300º CApplicationsRefuse incinerator, asphalt flue gas, fluid bed, coal furnace flue gas and cement Kiln gas.