ALTANA Hoffman Scratch Hardness Tester Short Instructions - Manual (Page 2)

Measure what you see.
Additives & Instruments
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ENGLISH
• The large rider weight produces a load of 100 grams
per increment
• The small rider weight produces a load of 25 grams
per increment
• Attach the rider weight(s) to the scale arm with
the arrow pointing left to the desired scale marker
Hoffman Scratch Tester
Operation
Operating the Instrument Adjusting the Load
• Place your hand on the roller carriage with thumb and
forefinger over the roller closest to the scratching tool
• Apply sufficient downward pressure so that the end of
the scale arm is lifted off the surface into an approximately
horizontal position
• While maintaining downward pressure pull the roller
carriage in the direction opposite the scale arm
Example:
Adhesion = The force required to scrape a path through the film,
when the stylus begins its motion on an uncoated portion of the panel Scratch Hardness = The force necessary to cut through the film to the
substrate.
total load = (100 X 15) + (25 X 7) = 1675 grams