R
10
3.2 ADHESIVES AND COATINGS
Cyanoacrylate adhesives are normally recommended for gluing dollies to the sample area due to their
relatively quick curing time. However, there are a number of coatings for which the cyanoacrylate adhesives
may not be suitable. These are:
1. Thermoplastics, celluloses, vinyl, chlorinated rubbers and some acrylics, due to the possibility of the
glue reacting with the coating.
2. Porous coatings e.g. some metal spraying, in which case the glue, due to its low viscosity will travel
into the coating, sticking particles together and possibly altering its adhesion.
A two-pack epoxy such as Araldite™ or a modified acrylic gel-type adhesive should be used with the
coatings described in (1) and (2) above.
If in doubt as to the type of adhesive to use, please contact the coating manufacturer for advice.
3.3 SUBSTRATES
The substrate must be solid enough to withstand the force at the pin without distorting. Metals thicker than
4 mm are usually satisfactory.
The Elcometer 108 is not suitable for wood and similar compressible materials.
Warped, deformed or distorted substrates will affect the test and may lead to invalid results.
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