Water-Vapor-Barrier Coatings for Polyurethane Foams
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1976
- Accession Number
- ADA027556
Entities
People
- David Van Daalen
- J. M. Boyd
Organizations
- Harry Diamond Laboratories