AP
The function of ring type Aston Seals AP is to avoid the extrusion and damage of the O-Ring that normally occurs in the presence of large gaps or high pressure.
If pressure arises on only one side of the O-Ring, it will suffi ce to fi t one antiextrusion ring on the unexposed side. Two backup rings are necessary if the pressure rises on both sides.
The AP ring hasn’t a cut or spiral shape (typical of PTFE backup rings) that could help damage the O-Ring especially in the presence of high pressure.
Thanks to its elasticity, it can be installed very easily in a short time and without any auxiliaries.
The material used is a medium modulus thermoplastic polyester resin, mainly used in the manufacturing of antiextrusion rings, that ensures an extra measure of performance and service life
