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Pencil hardness measuring instrument
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■ measuring principle Warmth and pressure used to evaluate the test results with different hardness testing tools (pencil) to draw the necessary cuts. ■ Equipment Condition
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■ SPEC decision
■ How to work
Deposition / coating: check scratch the surface of the coating layer
■ How to work
(We maintain a cylindrical shape) 5 ~ 6mm needles pencil mow it, experiment with pencil 2H Grade
. Hold the pencil vertically 400 # Pepa, Pepa value obtained by friction in horizontal
The abrasion roll until the needle is sharp (as no damage around the lump gap)
After installation, the pencil hardness groups, make a horizontal state, the bolt
. Place it on the specimen
. Takes the wheel with both hands, 0.5 ~ 1mm / sec speed to be at least 7mm promotion (primary propulsion, Not repeated, location, move it, and then determining the total proceeds 5th) weight: 750g
. Erase with the eraser, observe the specimen surface Scratch Clear, 5 chajung, Simi damage the coating layer, the determination OK, NG judgment when it does
