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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 & Features
Benefits
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Suitable for high temperature alkaline media
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Suitable for superheated steams
Features
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Utilization of carbon fibers
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Heat resistant additives
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Resistant to creep and cold flow
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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.
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