Heat-resistant seals

Heat-resistant seals are characterised by the following properties:

• Temperature resistance: can be used at temperatures from -50 °C to over 1000 °C, depending on the material.

• Compressive strength: suitable for use in high-pressure systems.

• Chemical resistance: resistance to aggressive media such as acids, alkalis or oils.

• Durability: retention of elasticity and sealing effect even under cyclic thermal loads.

Choosing the right material is crucial for the performance of a heat-resistant seal. The most important materials are:

Material	Temperature range	Properties	Typical applications
Silicone (VMQ)	-50 °C to +230 °C	Flexible, chemical-resistant	Automotive industry, food processing
Fluororubber (FKM, Viton®)	-20 °C to +250 °C	High chemical and heat resistance	Chemical industry, engine manufacturing
Graphite	Up to +1000 °C	Extremely heat-resistant, chemical-resistant	Power plants, high-temperature plants
Metal	Up to +1200 °C	High-pressure and heat-resistant	Flange seals, turbines
PTFE (Teflon®)	-200 °C to +260 °C	Chemical-resistant, low-friction	Pharmaceutical industry, chemical processes

Heat-resistant seals are used in numerous industries where high temperatures and aggressive media occur:

Automotive industry

• Cylinder head gaskets: withstand the high temperatures in combustion engines.

• Exhaust gaskets: resistant to thermal and chemical loads.

Chemical industry

• Flange seals: prevent leaks in piping systems at high temperatures.

• Reactor seals: resistant to chemical and thermal influences.

Energy and power plant industry

• Steam lines: seals that withstand extreme pressure and temperature conditions.

• Turbines: heat-resistant seals for sealing high-temperature areas.

Food and pharmaceutical industries

• Sterilisation plants: resistant to high temperatures and steam.

• Seals for plants: food-safe and heat-resistant, e.g. in baking ovens or cooking systems.

Heat-resistant seals offer numerous advantages:

• Reliability: retain their function even under extreme conditions.

• Versatility: available for different temperatures, media and pressure requirements.

• Durability: reduce downtime and maintenance costs.

• Safe operation: prevent leaks and ensure the protection of plants and the environment.

• Material selection: choosing the right material requires precise knowledge of the operating conditions.

• Costs: high-performance materials such as graphite or metal are expensive.

• Installation: improper installation can considerably shorten the service life of the seals.

Property	Silicone seal	Graphite seal
Temperature range	-50 °C to +230 °C	Up to +1000 °C
Flexibility	High	Limited
Chemical resistance	Medium	Very high
Costs	Low to medium	High
Typical applications	Food processing, automotive	Power plants, chemical reactors

• Which materials are suitable for extreme temperatures above 1000 °C? Graphite and metal seals are ideal for applications with temperatures above 1000 °C.

• Are heat-resistant seals food-safe? Yes, materials such as silicone or PTFE are both heat-resistant and food-safe.

• How do I choose the right seal for my application? Consider the temperature range, the chemical requirements and the pressure to select the right material.

• How long do heat-resistant seals last? Their service life depends on the operating conditions but can be extended considerably by correct installation and maintenance.

Heat-resistant seals are essential for safe and efficient operation in high-temperature environments. They offer solutions for various industries and guarantee reliability, safety and durability. Whether in the automotive industry, chemicals or energy technology, choosing the right seal ensures optimum performance and cost efficiency.