a)a thicker adhesive
b)a primer/adhesion promoter
c)stiffen up the natural rubber. It's well known that a stiffer
backing on tape leads to higher peel values. i.e., If you coat the
same adhesive with the same thickness on a 20 lb paper and on a 80 lb
paper, the latter will give you a significantly higher peel strength.
There is and there isn't a certain degree of gamesmanship in this
approach. I won't go into the details unless you ask for them and sign
a release waiver holding me not responsible for providing you with a
massive information overload.
Quoting from RUBBER IN ENGINEERING
(Chemical Publishing Co., 1946), page 175:
"To obtain high-performance bonds between rubbers
and metals, the bonding must be carried out during
vulcanization. The most important bonding methods
are those dependent upon brass-plating, upon the use
of chlorinated resinous materials such as chlorinated
rubber, or upon the use of cyclo-rubbers."
And later, from pages 176-177:
"The most important commercial method of bonding
is undoubtedly that depending upon the adhesion
of rubber to brass. Excellent adhesion is obtained
and the bond is not heat sensitive. Not all types
of brass will bond to rubber and the actual
composition appears to depend to a large extent on
the reactivity of the rubber compound. In this
country, the ratio favoured appears to be usually
about 70 parts of copper to 30 of zinc, but in the
United States it tends to be rather higher in copper
-- 75/25. It should be understood, however, that
bonds have been obtained with brasses of compositions
differing widely from those just quoted. If it is
possible to deposit a coherent and adherent brass
layer on any metal or alloy, then it is possible to
bond rubber to it. Iron, steel, stainless steel,
brass, bronze, aluminum and duralumin can be
successfully bonded either to natural or synthetic
rubber in this way."
Try one of the popular nitrile/phenolic resin blends for an
excellent heat setting adhesive. I used them for YEARS
bonding friction composites to steel, iron, aluminum,
Thank you for the input.
A small search on these resins brought me to 3M. It is unfortunate a
previous call to customer service ended up by: We do not provide any
adhesives for natural rubber...
The most promissing from 3M are the bonding films but have to check on heat
activation temperature. Solvent activation with MEK or acetone is out of the
Sovereign seems to have a water activated film, this is good.
Are these the products you were suggesting?
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