A gasket hatch showing a permanent groove in silicone gasket greater than 1/8 inch indicates what condition?

• A. Gasket is damaged
• B. Hatch is warped
• C. Seal is cracked
• D. No action required

Answer: (B)

A groove that deep in a silicone gasket shows the mating surface itself has distorted. When the hatch is not flat—i.e., it’s warped—the gasket is pressed unevenly as the hatch is bolted down, which digs into the gasket and leaves a permanent groove greater than 1/8 inch. That deformation means the seal can’t seat properly, so you need to address the hatch itself (often replacing or resurfacing it and rechecking the seating surface) and replace the gasket. It isn’t just a damaged gasket or a crack in the seal, and it certainly isn’t something you can ignore.