P84 (polyimide) needle felt

P84 polyimide needlefelts are excellent high temperature filter media in terms of performance, generally surpassing the other standard media with the exception of PTFE.
 
Features
• Excellent steady under high temperature and resistance to acid
• P84 can operate continuously, under practical and low acid working conditions, at temperatures up to 500°F(260 °C).
• High filtration efficiency, high tensile strength.
• The complex cross sectional shapes create 30-90% more collection surface area when compared to round or oval shaped fibers.
• Low back washing pressure, maximun flexibility
• The unique tri-lobal fiber structure of P84 provides customers with high efficiency filtration, low pressure drop, and reduced cleaning energy.
• Excellent dust cake release
• P84 has irregular, tri-lobal fibers that provide better collection efficiencies and enhanced dust cake release properties.
 
Applications
• Incinerator plants
• Cement Kiln gas
• Low acid coal fired boilers
• Asphalt/hot mix plants flue gas
• Minerals processing
• Soil remediation facilities
 
Specification

Composition		P84/P84 scrim
Weight (g/m2)		450	500	550
Thickness (mm)		2.1	2.3	2.5
Air permeability (L/m2/s)		19	15	12
Tensile strength (N/5×20cm)	Warp	650	700	800
	Weft	1150	1200	1300
Tensile elongation (%)	Warp	<35	<35	<35
	Weft	<55	<55	<55
Broken strength (Mpa/min)		2.55	2.50	2.40
Working temperature (℃)		≤ 260
Short time working temperature (℃)		280
Anti-acid		Excellent
Anti-alkali		Fair
Anti-abrasion		Excellent
The stability of water solution		Medial
Finishing treatment		High temperature hot pressing，Singeing