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Spiral Backup Ring is the most used, being effectively self- adjusting to diametrical tolerances. Spiral backup rings are manufactured in virgin P.T.F.E.

Solid Back Up Ring also known as endless back up rings are usually used when there are rotational problems which could cause the spiral to unwind. Solid back up rings are made from virgin P.T.F.E. Solid or endless split is as a solid back up ring but with a split at 30 degrees to ease fitting.

Parback Rings are usually made from Nitrile and Viton.  They are used to stop the migration of the o ring into the sealing gap under pressure, one side will usually be contoured to enhance a snug fit.