Thermoseal Klingersil C-4500 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.

Creep relaxation ASTM F38B : 20 %

Sealability ASTM F37A (1/32″) : < 0.3 ml/hr

Gas Permeability DIN 3535/6 : < 0.1 ml/min

Compressibility ASTM F36J: 8 – 14%

Recovery ASTM F36J: 50 % minimum

KLINGER Hot Compression Test

Thickness Decrease 73°F (23°C) : 12% initial

Thickness Decrease 572°F (23°C) : 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

ASTM Oil IRM 901, 5h/300°F (149°C) : 0 – 5 %

ASTM Oil IRM 903, 5h/300°F (149°C) : 0 – 3 %


ASTM Fuel A, 5h/73°F (23°C) : 0 – 5 %


ASTM Fuel B, 5h/73°F (23°C): 0 – 5%

Dielectric Strength ASTM D149-95a : 1.5 kV/mm

Density ASTM F1315 : 87 lb/ft ³ (1.4 g/cc ³)

Leachable Chloride Content FSA Method : 200 ppm

ASTM F104 Line Call Out : F712122B3E11K6M5

Color : Black

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":

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Gases & Steam


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. Please call or refer to KLINGERexpert for assistance.

In area 3
do not install gaskets in these applications without first referring to KLINGERexpert or contacting KLINGER Thermoseal’s technical support service.


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Tampa: (813) 337-6442

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