C-4408 - Aramid Fiber Sheets With Nitrile Binder

Technical Sheet

APG's C-4408 - Aramid Fiber Sheets with a Nitrile Binder is a universal high-pressure gasket material for industrial applications.

This material has a low carbon steel woven mesh insert that improves stress relaxation and makes this material suitable for fluctuating temperatures and pressures.

C-4408 has good resistance to oils, fuels, and hydrocarbons. This material is manufactured with aramid fiber reinforced with a nitrile binder.

4408b

 

Benefits & Features

Benefits Features
  • Suitable for higher pressures

  • Resistant against blow-outs

  • More safety at high internal pressures

  • Wire Reinforcement 

  • Improved Stress Relaxation

Product Specifications

Typical Values Refer to 1/16'' Thick Material Unless Noted

Creep relaxation ASTM F38B (1/32") 20 %
Compressibility ASTM F36J 6 - 12 %
Recovery ASTM F36J 50 % minimum
KLINGER Hot Compression Test  
1 Thickness Decrease 73°F (23°C) 1 12 % initial
2 Thickness Decrease 572° F (300°C) 2 22 % additional
Weight increase ASTM F146 after immersion in  
Fuel B, 5h/73°F (23°C)
10 % maximum
Thickness Increase ASTM F146 after immersion in  
1 ASTM Oil IRM 901, 5h/300°F (149°C)  1 0 - 5 % 
2 ASTM Oil IRM 903, 5h/300°F (149°C) 2 0 - 5 %
3 ASTM Fuel A, 5h/73°F (23°C) 3 0 - 5 %
4 ASTM Fuel B, 5h/73°F (23°C) 4 0 - 5 %
Density ASTM F1315 119 lb/ft ³ (1.9 g/cc ³)
ASTM F104 Line Call Out F712112B3E11M6
Color Black

 

DOWNLOAD SPEC SHEET

 

Pressure/Temperature Graphs

The pressure/temperature graphs shown are the most current method of determining the suitability of a gasket material in a known environment. However, chemical compatibility must also be considered.

pT diagram for thickness 1/16":

Gases & Steam

KLINGERSIL C-4408 Steam

Liquids

KLINGERSIL C-4408 Liquid (1)

In area 1 the gasket material is suitable using common installment practices subject to chemical compatibility.
In area 2 appropriate measures are necessary for installation of the gasket to ensure maximum performance.
In area 3 do not install gaskets in these applications without first contacting APG for technical support service.