 Impact
Testers have gained wide acceptance in testing the impact resistance
of many types of coatings including paints, varnishes, plastic and
laminates. They have also been also been widely used to establish
quality control standards for resistance to impact surface damage
and penetration of materials such as plastics, resins, fiberglass,
sheet metals and plywood.
The
tester consists of a solid base stand with a guide tube support.
The guide tube has a slot that directs the weight and includes graduations
to facilitate reading where the weight is dropped. The weights have
build-in steel balls that provide different geometrical configurations,
and the base of the instrument includes a die support.
A specimen
is placed over a hole in a die mounted in the anvil. The punch is
placed upon the specimen. The weight is raised to the desired height
in the guide tube and released. Damage to the sample is usually
evaluated visually or with low power magnification.
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