High temperature silicone rubber automobile exhaust pipe seals

High temperature silicone rubber automobile exhaust pipe seals

The commonly used rubber seal material at the joint of automobile exhaust pipes is High-Temperature Silicone Rubber. This material has high heat and chemical resistance and can withstand the effects of high-temperature exhaust gases and chemicals in the exhaust system. It also has a certain degree of flexibility and elasticity, which can provide better sealing performance and prevent exhaust gas leakage.

High-temperature silicone rubber seals are widely used in automobile exhaust systems because of their ability to maintain good performance in high-temperature environments and their resistance to chemicals produced in exhaust systems. In addition, high-temperature silicone rubber also has good wear resistance and anti-aging properties, and can maintain a long life in long-term use.

High-Temperature Silicone Rubber is a seal material commonly used in automobile exhaust systems. This rubber material has high heat resistance and can withstand high-temperature exhaust gases in the exhaust system.

High-temperature silicone rubber seals seal the joints of automobile exhaust pipes to prevent exhaust gas leakage.

High temperature resistance: High temperature silicone rubber can maintain good performance in high temperature environments and can usually withstand temperatures of hundreds of degrees Celsius.

Chemical resistance: This material has good resistance to chemicals produced in the exhaust system and can resist the erosion of acids, alkalis and other chemicals in the gas.

Elasticity and flexibility: High-temperature silicone rubber has a certain degree of elasticity and flexibility, which can provide good sealing performance at the exhaust pipe connection.

Wear resistance and anti-aging properties: This material has good wear resistance and anti-aging properties, and can maintain a long life in long-term use.

Properties High temperature silicone rubber automobile exhaust pipe seals

High-Temperature Silicone Rubber, as a material for automobile exhaust pipe seals, has the following mechanical, physical, chemical and processing properties

Mechanical behavior

Strength and toughness: High-temperature silicone rubber has good strength and toughness and can withstand certain stretching and tearing forces.
Compression performance: The material can return to its original shape under compression and has good compression elasticity.
Elasticity and softness: High-temperature silicone rubber has a certain degree of elasticity and softness, and can adapt to the shape and changes of the exhaust pipe connection.

Physical properties

Heat resistance: High-temperature silicone rubber can maintain good performance in high-temperature environments and can usually withstand temperatures of hundreds of degrees Celsius.
Sealing performance: This material has good sealing performance and can effectively prevent exhaust gas leakage.
Anti-vibration and shock-absorbing performance: High-temperature silicone rubber can reduce the transmission of vibration and noise, providing better shock-absorbing effects.
Electrical insulation properties: This material has good electrical insulation properties and can prevent the conduction of electric current.
Chemical properties:

Chemical resistance: High-temperature silicone rubber has good resistance to chemicals produced in the exhaust system and can resist the erosion of chemicals such as acids and alkalis in the gas.
Oil resistance: This material has good resistance to oil substances and can prevent oil leakage in automobile exhaust systems.

Processing performance

Plasticity: High-temperature silicone rubber has good plasticity and is easy to process into seals of various shapes and sizes.
Wear resistance: This material has good wear resistance and can maintain a long life in long-term use.
Aging resistance: High-temperature silicone rubber can resist oxidation and aging and has a long service life.

It is important to note that specific mechanical, physical, chemical and processing properties may vary depending on material formulation, hardness and manufacturing processes.

Silicone (VMQ) rubber contains methyl and vinyl groups attached to the main silicone chain. Silicone O-rings are characterized by excellent resistance to temperature extremes and thermal cycling. Silicone rubber compound does not impart odor or taste, which makes it suitable for many food and pharmaceutical applications. Silicone rubber, however, has poor mechanical properties as compared to other elastomers and for this reason, silicone o-rings are generally not used in dynamic applications. Silicone has great resistance to animal/vegetable oil/grease, diluted salt solutions, and high molecular weight chlorinated aromatic hydrocarbons. Silicone is not suitable for use with acids, alkalis, silicone-based lubricants, or super-heated steam (over 121°C).

Some common testing standards

Hardness test: According to relevant standards, such as ASTM D2240, the hardness of silicone rubber seals is tested to determine its hardness value.

Density Testing: By ASTM D297, the density of a material is measured to determine its mass and volume.

Tensile strength and elongation testing: According to ASTM D412, the strength and elongation of materials in the tensile state are tested to evaluate their tensile properties.

Compression deformation test: According to ASTM D395, materials are subjected to compression testing to evaluate their elastic recovery properties under compression.

Heat resistance test: By exposing the sample to a high temperature environment, such as ASTM D573, the heat resistance of the material is tested to determine its performance stability under high temperature conditions.

Chemical resistance testing: Test the chemical resistance of materials by exposing them to various chemicals, such as acids, alkalis, etc., to evaluate their resistance to use in automotive exhaust systems.

Sealing performance test: Evaluate the sealing performance of the seal through a pressure test or air tightness test, such as ASTM E515, to ensure that it can effectively prevent gas leakage.

Wear resistance and aging performance test: According to ASTM D5963, the material is tested for wear resistance and aging performance to evaluate its durability in long-term use.