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Primer and Adhesive Selection
Several major vendors of rubber/metal bonding primers and adhesives were contacted for their
recommendations and experience with the polymer types and metal substrates proposed in the program.
Based on the suppliers' recommendations and in-house experience with various primers, the following
candidates were selected for evaluation, both singularly and in combination with others.
a) Chemlok AP-144 (Lord Chemical)
b) Chemlok 610 " "
c) Chemlok Y4310 "
d) Chemlok Y1540 ""
e) Chemlok 205 "
f) Chemlok 220 "
g) Chemlok 252 "
h) Ty-Ply BN "
i) Thixon P-6-1 (Whittaker-Dayton)
j) Thixon 508 "
k) Thixon P-14 "
1) Megum 3270 (Chemetal)
m) Megum V12588 "
n) Megum 9290/1 "
To minimize the possibility of variance in the metal substrate, all specimens for adhesion testing
were cut from a type 303 SS full size cage skeleton. Each specimen was nominally 1/2" in width x 3.0"
in length with a thickness of .060". To prepare for priming, all specimens were degreased, shot blasted
with GL25 steel shot and degreased again to remove any dust or residue. The various primers were then
mixed to the proper consistency and the specimens hand painted. Each specimen was identified as to
primer(s) and number of coats. After drying, each specimen was vulcanized with each of the 3 EPDM
test compounds in a bar type mold at 350*F for 20 minutes. Two or more control specimens were also
molded from each compound. All specimens were post cured for the same time and at the temperatures
used in polymer testing.
Initial tests were conducted for 48 hours in the circulating air oven at 550*F. Of the samples
tested, only combinations of Megum V12588 over Megum 3270 primer, and Megum V12588 over Lord's
TY-PLY BN looked promising, both sustaining a 99% elastomer-to-substrate adhesion after cooling. All
other samples had marginal or non-existent adhesion.
A second test was performed, using new specimens produced under the same procedure, and
subjected to 550*F for 48 hours in brine at 5000 PSI. After cooling, the Megum 3270/V12588 and TY-
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