DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
Water-Vapor-Barrier Coatings for Polyurethane Foams
HARRY DIAMOND LABS ADELPHI MD
Pagination or Media Count:
The water-vapor transmission rates through a polyether type of polyurethane foam with and without vapor-barrier coatings were determined at 70 C and 91-percent relative humidity. The data indicate that polyurethane foam encapsulation cannot provide satisfactory protection from moisture penetration. The moisture transmission is more severe for low-density foam. Two low- molecular-weight, butyl-rubber coating materials and one epoxy compound were shown to form good coatings on the foam and resulted in 37- to 95-percent transmission-rate reductions when the coatings were nominally 0.020 in. thick.
APPROVED FOR PUBLIC RELEASE