Head Gaskets
A head gasket is a seal consisting of a ring. Head gaskets are used for packing pistons or sealing a pipe joint.
Head gaskets are commonly used in the automotive industry to seal the cylinders between an engine block and the internal combustion engine. Most cars use MLS (multi-layered steel) gaskets. However, some use copper or occasionally aluminum, which is often coated in Teflon or another heat-resistant coating to prevent thermal expansion (which can lead to a "blown" (leaking) gasket). Copper head gaskets are often used in situations with extremely high pressure, such as high-output motors.
Head gaskets are a small but incredibly important component in automobiles. If a gasket blows, it can lead to extensive engine damage. Engine overheating and increased engine wear can result from motor oil being mixed with engine coolant, or hydrolock can occur from coolant leaking into the cylinders.