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Abstract
This document was prepared at the request of US Army Engineer District, Baltimore, to provide assistance in obtaining data on the delamination of seams of an EPDM roofing system at Ft. Belvoir, VA. The investigaion was beneficial to NIST, because it provided an opportunity to characterize adhesive-bonded seams in service and to obtain data relative to NIST lab research on the effect of surface contamination on seam performance. Seam specimens were taken from the roof and analyzed for peel strength and surface condition of the rubber. In addition, seams were prepared in the lab using the same brane name rubber/ adhesive systems to obtain peel-strength values for comparison with those measured for the field specimens. The results of the study indicated that the field specimens had low T-peel bond strengths in comparison to the strengths achieved by te lab-prepared seams. Small voids in the adhesive layer of the seams of the field seams may have contributed, in part, to the low bond strength. SEM analysis of the field formed seams indicated the presence of a talc-like contamination on the rubber surface which may have als contributed to the low strength. In addition, SEM analysis of some lab specimens cleaned with the proprietary wash solution showed a talk-like contamination which was not visible to the unaided eye. Other lab specimens cleaned using the wash solutiuon did not show such contamiation.
This document was prepared at the request of US Army Engineer District, Baltimore, to provide assistance in obtaining data on the delamination of seams of an EPDM roofing system at Ft. Belvoir, VA. The investigaion was beneficial to NIST, because it provided an opportunity to characterize adhesive-bonded seams in service and to obtain data relative to NIST lab research on the effect of surface contamination on seam performance. Seam specimens were taken from the roof and analyzed for peel strength and surface condition of the rubber. In addition, seams were prepared in the lab using the same brane name rubber/ adhesive systems to obtain peel-strength values for comparison with those measured for the field specimens. The results of the study indicated that the field specimens had low T-peel bond strengths in comparison to the strengths achieved by te lab-prepared seams. Small voids in the adhesive layer of the seams of the field seams may have contributed, in part, to the low bond strength. SEM analysis of the field formed seams indicated the presence of a talc-like contamination on the rubber surface which may have als contributed to the low strength. In addition, SEM analysis of some lab specimens cleaned with the proprietary wash solution showed a talk-like contamination which was not visible to the unaided eye. Other lab specimens cleaned using the wash solutiuon did not show such contamiation.
Date
11/1988
11/1988
Author(s)
Walt Rossiter Jr; James Seiler Jr
Walt Rossiter Jr; James Seiler Jr
Page(s)
36
36
Keyword(s)
adhesive bonding; bond strength; contamination; EPDM; SEM analysis; surface condition; delamination; seam
adhesive bonding; bond strength; contamination; EPDM; SEM analysis; surface condition; delamination; seam