C-4500 - Carbon Fibers And Special Heat-Resistant Additive Sheets With Nitrile Binder

Technical Sheet

APG's C-4500 - Carbon Fibers and Special Heat-Resistant Additive Sheets with Nitrile Binder is a premium grade, high-pressure gasket material designed for use in high-temperature alkaline media and superheated steam. 

C-4500 is a superior performance material suitable in the pulp and paper industry and the chemical industry. This material is manufactured with carbon fibers and special heat-resistant additives and reinforced with a nitrile binder.
4500b

Benefits & Features

Benefits

  • Suitable for high temperature alkaline media

  • Suitable for superheated steams

Features

  • Utilization of carbon fibers

  • Heat resistant additives

  • Resistant to creep and cold flow

  • Dimensionally stable

Product Specifications

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

Creep relaxation ASTM F38B (1/32") 20 %
Sealability ASTM F37A (1/32") < 0.3 ml/hr
Gas Permeability DIN 3535/6 < 1.0 ml/min
Compressibility ASTM F36J 8 - 14 %
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 10 % 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 - 3 %
3 ASTM Fuel A, 5h/73°F (23°C) 3 0 - 5 %
4 ASTM Fuel B, 5h/73°F (23°C) 4 0 - 5 %
Dielectric Strength ASTM D149-95a 1.5 kV/mm
Density ASTM D149-95a 87 lb/ft ³ (1.4 g/cc ³)
Leachable Chloride Content FSA Method 200 ppm
ASTM F104 Line Call Out F712122B3E11K6M5
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

4500-g&s

Liquids

4500-liquid

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.