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VMQ, also known as silicone, is also used for oil seals, but this is less common because the mechanical strength of VMQ is low and this material has poor wear-resistance This makes it less suitable for dynamic applications, but it can withstand fairly low and high temperatures from -60 °C to 200 °C. Many types of VMQ are also suitable for contact with pharmaceutical and food products, so VMQ is an option worth considering. VMQ oil seals are usually available on request.
- Unlike gasoline engines, diesel engines rely on compression ignition to ignite the fuel-air mixture. This means that diesel engines do not require a spark to ignite the fuel. However, diesel engines still require spark plugs to facilitate the combustion process. Diesel spark plugs are designed to withstand the high temperatures and pressures found inside a diesel engine's combustion chamber.