19
2025
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09
What materials are spark plug caps made of?
Author:
The materials for spark plug caps (commonly referring to high-voltage caps) mainly include the following two categories:
Metal material
Stainless steel: Used for the outer casing of high-pressure caps, it features excellent corrosion resistance and high hardness, ensuring a robust and stable structure.
Brass: Some high-pressure caps are made from brass to enhance overall durability.
Insulating material
Mica: As a traditional insulating material, it boasts high-temperature resistance and corrosion-resistant properties.
Polytetrafluoroethylene (PTFE): This material is commonly used in modern high-pressure caps due to its excellent insulation properties and exceptional stability.
Additionally, some high-pressure caps are equipped with rubber O-rings on their inner walls, which provide sealing and shock absorption to prevent fuel leakage.
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