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Hardness Scale Chart

HardnessScaleChart.pdf

Knoop
Hardness Scale

Material
Wood – Pine 10
Copper 120
Limestone 125 – 150
Marble 140 – 180
Slate 140 – 250
Porcelain Fixtures & China 400 – 500
Glass & Ceramic 400 – 550
Ceramic Wall Tile 450 – 550
Porcelain Wall Tile 500 – 650
Porcelain Floor Tile 500 – 650
Marble Style Porcelain Floor Tile 500 – 650
Granite Style Porcelain Floor Tile 500 – 650
Granite 550 – 650
Quartz 820
Common Tool Steel 700 – 900
Tungsten Carbide 2,000
Diamond 7,000

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