Spiral Wound Gaskets (SPW)

The metal strip provides the basic structural element, while the filler material provides an excellent seal. This combination of materials means that spiral-wound gaskets may be used under fluctuating temperature and pressure conditions.
Depending on the intended application, spiral-wound gaskets may be specified with or without an outer and inner ring.

Graphite is usually used as a filler material.
Other materials are only used if graphite contaminates
the media or is not chemically resistant.

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The outer ring

*Centres the gasket between the bolts.
*Protects the spiral element.
*Acts as a compression stop and prevents over-compression of the sealing element.
*Prevents radial flow of filling materials such as PTFE.

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The inner ring

*Reduces the possibility of turbulence and gap corrosion.
*Prevents radial flow of filling material such as PTFE.
*Acts as a heat shield when the gaskets are exposed to extreme temperatures.