High‑Temperature and Chemical‑Resistant Oil Seals Made from FKM PTFE

In industrial applications, the material of an oil seal plays a critical
role in its performance, especially when exposed to high temperatures and
corrosive environments. Choosing the right oil seal material is essential
for ensuring the long-term stability and efficiency of equipment. Below is
an analysis of the performance of commonly used oil seal materials in terms
of high-temperature and corrosion resistance.

Nitrile Rubber (NBR) Oil Seals: Ideal for Oil-Based Applications

Nitrile rubber (NBR) oil seals are widely used in hydraulic and lubrication
systems, especially for sealing oil-based media such as grease and
petroleum-based liquids. NBR provides stable sealing performance in these
applications. However, NBR has limited high-temperature resistance, with a
typical operational temperature range of up to 125°C. Additionally, NBR is
not resistant to strong acids and alkalis, making it unsuitable for
environments involving highly corrosive chemicals.

Fluoroelastomer (FKM) Oil Seals: The Reliable Choice for High Temperature
and Corrosion Resistance

Fluoroelastomer (FKM) oil seals excel in both high-temperature and corrosion
resistance. They can handle operating temperatures up to 250°C and are
commonly used in high-temperature applications such as automotive engines
and chemical pumps. In addition to their high-temperature resistance, FKM
seals are highly resistant to a wide range of aggressive chemicals,
including strong acids, alkalis, and organic solvents. This makes them a
preferred material in applications with stringent temperature and chemical
requirements.

Perfluoroelastomer (FFKM) Oil Seals: The Ultimate Choice for Extreme
Conditions

For extreme high-temperature and highly corrosive environments,
Perfluoroelastomer (FFKM) is an unparalleled option. FFKM seals can
withstand temperatures over 300°C and are virtually immune to almost all
chemicals, including strong acids, strong alkalis, oxidizing agents, and
most solvents. FFKM oil seals are commonly used in aerospace, petrochemical,
and other high-demand industries. However, due to their high cost, they are
typically selected only when absolutely necessary.

Ethylene Propylene Diene Monomer (EPDM) Oil Seals: Cost-Effective Choice for
Low-Temperature and Water-Based Media

EPDM oil seals are known for their excellent resistance to water, steam, and
weak acids and alkalis. They are suitable for sealing water-based media and
environments with lower temperatures, with an operational temperature range
between -40°C and +125°C. While EPDM seals perform well in these
conditions, they are not suitable for high-temperature or oil-based
applications. EPDM is commonly used in automotive cooling systems, HVAC
systems, and water treatment applications due to its cost-effectiveness and
stable performance in low-temperature and water-based environments.

Polytetrafluoroethylene (PTFE) Oil Seals: Chemical Resistance without
Compromise

PTFE oil seals are known for their outstanding chemical resistance, capable
of withstanding almost all corrosive chemicals, including strong acids,
alkalis, and organic solvents. PTFE has a high-temperature tolerance up to
260°C, making it suitable for chemical processing and food industries.
However, PTFE has relatively poor elasticity compared to elastomers, which
limits its use primarily to static sealing applications rather than dynamic,
high-speed seals.

Silicone Rubber (VMQ) Oil Seals: Ideal for High and Low-Temperature Extremes

Silicone Rubber (VMQ) oil seals offer excellent performance across a wide
temperature range, from -60°C to +225°C. They are particularly well-suited
for extreme temperatures, both high and low. While silicone rubber may not
have the same level of corrosion resistance as fluoropolymers, it performs
well in most non-oily environments. It is commonly used in food processing,
pharmaceuticals, and other industries with stringent temperature
requirements. However, silicone rubber is not recommended for strong acids
or alkalis.

ACM Oil Seals: Resistant to Oil and High Temperatures

ACM oil seals are commonly used for applications requiring resistance to oil
and high temperatures. ACM oil seals typically perform well in temperatures
up to 150°C and provide good resistance to mineral oils and fuels. However,
they have limited chemical resistance, especially against strong acids and
alkalis. ACM is widely used in automotive and engineering machinery
applications, where oil resistance is critical.

How to Choose the Right Oil Seal Material?

When selecting the appropriate oil seal material, it is important to
consider several key factors:

Temperature Resistance: If the equipment operates in a high-temperature
environment, FKM, FFKM, or PTFE are ideal options. If the temperature range
is broader, silicone rubber (VMQ) and EPDM can offer good performance.

Medium Compatibility: For oil-based applications, NBR and ACM are the best
choices. For water-based media or weak acids and alkalis, EPDM and silicone
rubber are suitable. For environments requiring high chemical resistance,
FFKM and PTFE are recommended.

Cost Considerations: FFKM and PTFE are expensive materials, making them
suitable for extreme conditions. FKM and EPDM offer good value for most
industrial applications.

By clearly defining the equipment's temperature range, medium type, and
working conditions, selecting the appropriate oil seal material becomes a
straightforward process.

Minimum Order: 1000 pieces

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