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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.

P84 Fiber 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 strengh
- 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.

Disadvantages
- Fair resistance to alkali

Applications
- Incinerator plants,
- Cement Kiln gas
- Lowacid coal fired boilers
- Asphalt/hot mix plants flue gas
- Minerals processing
- Soil remediation facilities

Compositions

P84/P84 scrim

P84/galss scrim

Weight (g/m2)

450
500
550

800

850
900

Thickness (mm)

2.1
2.3
2.5

2.5

2.8
3.0

Permeability (m3/m2/min)

19
15
12

16

13
10
Tensile strength(N/5 20cm)
Warp

650

700
800

1800

1800
1800
Weft

1150

1200
1300

1800

1800
1800

Tensile Elongation ()

Warp

<35

<35
<35

<10

<10
<10
Weft

<35

<35
<35

<10

<10
<10

Broken strength
(Mpa/min)

2.55
2.50
2.40

3.20

3.10
2.95

Working Temperature(≧)

+ 260

+ 260

Short time Working temperature(≧)

280

280

Anti-acid

Excellent

Excellent

Anti-alkali

Fair

Fair

Anti-abrasion

Excellent

Excellent

The stability of water solution
Medial
Medial
Finishing treatment
High temperature hot pressingSingeing
High temperature hot pressingSingeing, membrane.
 
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