Spiral wound gaskets are a type of gasket that consists of a spiral winding of a metallic or non-metallic material with a filler material. There are several types of spiral wound gaskets, including:

Basic spiral wound gaskets: These are the most commonly used spiral wound gaskets, and they are made of alternating layers of metal and filler material wound in a spiral pattern. The metal can be stainless steel, carbon steel, or other alloys, while the filler material is usually graphite or PTFE.

Inner ring spiral wound gaskets: These gaskets have an additional inner ring made of metal or other material to provide extra support and prevent buckling of the winding layers. The inner ring can be made of the same material as the winding layers or a different material.

Outer ring spiral wound gaskets: These gaskets have an outer ring made of metal or other material to provide extra protection and prevent the winding layers from being damaged during installation or use. The outer ring can be made of the same material as the winding layers or a different material.

Centering ring spiral wound gaskets: These gaskets have a centering ring made of metal or other material to help align the gasket during installation and prevent it from slipping or shifting. The centering ring can be made of the same material as the winding layers or a different material.

Heat exchanger spiral wound gaskets: These gaskets are specially designed for use in heat exchangers and other high-pressure, high-temperature applications. They have a different winding pattern and are typically made of thicker layers of metal and filler material to withstand the extreme conditions.