A spiral wound gasket is manufactured by spirally winding a pre formed metal strip and a filler on the outer periphery of metal winding mandrels. The winding mandrel outside diameter forms the inner diameter of the gasket and the laminations are continually wound until the required outer diameter is attained.
The process for forming a spirally wound gasket begins by first choosing a loop of strip metal of a predetermined circumference (hence also a predetermined diameter). You must determine the required pressure applications of your gasket in order to maintain the appropriate pressure during the winding process. As a general rule, low winding pressure and thick soft fillers are used for low pressure applications. Thin fillers and high pressure loads are used for high pressure applications.

Step 3

Step three requires simultaneously spirally winding the loop of metal in convolutions and simultaneously welding or adhering the metal to the previous underlying strip. During the winding process maintain pressure on the metal strips and make sure to lay asbestos strips or whatever filler is appropriate to your specifications in between each loop of metal.