7
Safety Precautions
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CENTER
PUNCH TEST
Sinks in
with
average
hammer
blow
TOO SOFT TOO HARD
Point
flattens
Surface
shatters
Start
3
GREEN
2
BROWN
4
YELLOW
CAST
IRON GLASS TILE BRICK
1
GRAY
TOO BRITTLE
G 018
G 018
G 018
G 018 G 018
G 018