SEDL / STP / STP1088-EB / STP26552S

Effects of Adhesive Thickness, Open Time, and Surface Cleanness on the Peel Strength of Adhesive-Bonded Seams of EPDM Rubber Roofing Membrane

Watanabe, H
Guest ResearcherResearch Chemist, Takenaka Corp.Center for Building Technology, National Institute of Standards and Technology, TokyoGaithersburg, MD

Rossiter, WJ
Guest ResearcherResearch Chemist, Takenaka Corp.Center for Building Technology, National Institute of Standards and Technology, TokyoGaithersburg, MD

Pages: 16    Published: Jan 1990

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Abstract

A laboratory study was conducted to examine the effects of adhesive thickness, open time, and surface cleanness on T-peel strength of EPDM (ethylene propylene diene terpolymer) rubber seam specimens. Seam specimens bonded with butyl-based contact adhesive were tested after a 2-week cure time. The peel strength generally showed a positive dependency on the adhesive thickness except that it tended towards a plateau value for thick adhesive layers. The leveling of peel strength at large thickness might result from the presence of small voids in the adhesive layer. The peel strength was not dependent on the open times used in this study. Increased levels of surface contamination lowered the peel strength and changed the failure mode from cohesive to adhesive.