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.
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 |
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
Liquids
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.