FP - Seal Defects (Wrinkle)

Classification 

A major defect if the fold in the seal area leaves less than 3 mm (3/32-inch) continuous acceptable seal.
A minor defect if the fold in the seal area leaves greater than 3 mm (3/32-inch) continuous acceptable seal.

Identification 

A wrinkle is a material fold in the seal area.

Causes 

The sealing surfaces were not flat and parallel or were not tensioned properly.