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Performance of Tape-Bonded Seams of EPDM Membranes: Comparison of the Peel Creep-Rupture Response of Tape-Bonded and Liquid-Adhesive Bonded Seams.


pdf icon Performance of Tape-Bonded Seams of EPDM Membranes: Comparison of the Peel Creep-Rupture Response of Tape-Bonded and Liquid-Adhesive Bonded Seams. (3579 K)
Rossiter, W. J., Jr.; Vangel, M. G.; Embree, E. J.; Kraft, K. M.; Seiler, J. F., Jr.

NIST BSS 175; 67 p. May 1996.

Available from:

Government Printing Office
Order number: SN003-003-03411-8

Keywords:

adhesive tapes; adhesive testing; bonding; building technology; creep-rupture; EPDM; microscopy; roofing; seams; time-to-failure

Abstract:

A study was conducted to compare the creep-rupture response (i.e., time-to-failure of TTF) of tape-bonded and liquid-adhesive-bonded seams of EPDM (ethylene-propylene-diene terpolymer) roofing membranes. Two commercial tape systems (i.e., tape and primer) and one liquid adhesive were applied to well-cleaned EPDM rubber. The creep-rupture experiments were conducted at 23 DGC (73 DGF) and 40% to 45% relative humidity under peel loads ranging from 3.1 N to 24.9 N (0.7 lbf to 5.6 lfb). For each adhesive system, the data were found to be fitted well by the model: ln(mean TTF)=b0 + b1 DT Load + b2 exp(b3 DT Load). A comparison of the fitted curves for the tape-bonded specimens with those for the liquid-adhesive-bonded sepecimens provided a basis for evaluating the relative creep-rupture response of the two types of bonding systems. Similarly, a comparison of the fitted curves for the replicate data sets of each adhesive system gave a measure of the batch-to-batch reproducibility of the creep-rupture data. The major conclusion was that the tape-bonded specimens had times-to-failure that were, in most cases, comparable to or greater than those of the liquid-adhesive-bonded specimens. And, the tape-bonded specimens provided time-to-failure results that were reproducible between replicate sets.