Self-sealing fastener

摘要

A fastener suitable for use in airplane manufacture or repair that is coated with a pre-mixed moisture cure sealant. The sealant layer is coated with a frangible moisture barrier that will break apart when the fastener is installed, thus exposing the sealant to atmospheric moisture. Once exposed to moisture, the sealant will begin to cure. Preferred embodiments also provide a moisture indicator that provides a visual indication that the outer moisture resistant layer has been damaged.

主权项

1. A fastener pre-coated with a sealant comprising:
a fastener; a coating of an uncured sealant applied to at least a portion of the fastener surface, said sealant comprising a one-part sealant that cures when exposed to moisture; and a protective layer covering the surface of the uncured sealant and preventing moisture from reaching the uncured sealant, the protective coating being sufficiently brittle that the protective layer will fracture when the fastener is installed allowing atmospheric moisture to reach the uncured sealant and initiate sealant curing.