The video source is howautowork.com.it is about gasket definition,purpose generally to prevent leakage between the two objects while under compression,manufacturing materials,brass,alloy,and more .

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HowAutoWork.com Gaskets This section examines gaskets. Gaskets form as seal by being compress between stations rebuts where liquid or gas could pass. Most gaskets are made to be use only once. They can be made of soft materials, such as cook, rubber, paper and specious. They can also be made of soft adenoids and materials such as brass, cooper, aluminum, or soft steel shift metal. Choosing which material and design to use depends on the substance to seal. The pressures and temperatures involved, and the materials and matting surfacing to be sealed. Head Gaskets seal and contain the pressure of combustion within the engine between the saline in the head and block. By also seal oil passages between block and head and control the flow of colloid between the block and the head. Some Gaskets provide or just clearances. Some joints between surfaces of Morton engines have been sealed with special ceilings, which eliminate the use of Gaskets in some applications. Gaskets around the rotating part would quickly ware out and lick. To seal this packs, oil seals are needed. Many different kinds of being develop. The most widely use is the lip type dynamic oils seal. It has a shape dynamic rubber lip that is held in contact with the shaft to be sealed by a circular coil spring called agata spring. A similar ceiling principle is use to seal the valve steam to prevent oil entering the engine combustion chamber. Rotating or sliding shafts could also be sealed by using O-rings. But generally they are not just durable in most applications as the lip type seal. As a generally role, oil seals must be replace when the component is over whole.