5
CA80
PREPARING THE ADHESIVE SURFACES
4 PREPARING THE ADHESIVE SURFACES
4.1 General information
The installation quality basically depends on the preparation of the measuring point. The
aim is to create a surface that is even and oxide-free so that it can be easily wetted.
The condition of the measurement object will determine which of the following steps are
necessary.
4.2 Coarse cleaning
u Remove films of oxide and Eloxal, paint and other contamination from a generous
area around the measuring point.
4.3 Degreasing
The choice of cleaning agent will depend on the type of impurity and the sensitivity of the
material used in the workpiece being measured. Recommended for most applications is
the cleaning agent RMS1 (HBM order no.: 1-RMS1 or 1-RMS1-SPRAY), a mixture of
acetone and isopropanol. Powerful grease-dissolvers, such as methylethylketone or
acetone, are also commonly used. Toluene is suitable for removing wax-like substances.
When larger areas are contaminated, it is advisable to first clean them with water and an
abrasive agent.
u Wash over the surface to be cleaned with a piece of non-woven fabric soaked in
solvent. First, clean a larger area around the measuring point, then clean ever smaller
areas, so that dirt and impurities are not rubbed into the measuring point from the
edges.
Important
You should never use a solvent that is technically pure; chemical purity is essential. The
solvent must never be taken directly from the storage container, it is better to pour some
solvent into a small, clean dish first, where you can then soak up the amount of solvent
required with the non-woven fabric. On no account should any remaining liquid be poured
back into the storage container as this would contaminate the contents.
4.4 Roughening
A slightly roughened surface provides a larger surface for the adhesive and therefore
improves adhesion. You can obtain this kind of surface by sandblasting, etching or sand
ing with medium-coarse emery cloth.
u 320 grain corundum, which must be completely clean and should only be
used once, is suitable for sandblasting. When using emery cloth (recommendation:
220 to 300 grain), please roughen in a circular motion.
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