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Welcome to Colorbuilding B.M. Ltd

　Our standard for tile

　　　　

Water absorption (lower absorption rate,better quality)

　　　

Feature

American standard

(ASTM)

European standard

(EN176-1991)

Our standard

Water absorption

C(373)≤0.5%

≤3.0%

≤0.1~0.5%

　Dimensional deviation(lower deviation value,better quality)

Feature		American standard (ASTM)	European standard (EN176-1991)	Our standard
Length&width	Unit tolerance	C499	±0.6%	±0.2%
Length&width	10units average tolerance	±0.6%	±0.6%	±0.2%
Thickness	Unit tolerance	±5%	±5%	±2%

Distortion(lower value,better quality)

Feature	American standard (ASTM)	European standard (EN176-1991)	Our standard
Side Straight	±0.5%	±0.5%	±0.2%
Squareness	C502±0.6%	±0.6%	±0.2%
Center curvature	±0.5%	±0.5%	±0.2%
Warp angle	±0.5%	±0.5%	±0.2%

Modulus of rupture and breaking strength

Feature	American standard (ASTM)	European standard (EN176-1991)	Our standard
Breaking strengthS(N)	---	---	≥2100
Thickness≥7.5mm
Modulus of rupture(Mpa)	C648≥27	≥27	≥40
S＜3000N

Mohs hardness and wear resistance

Feature	American standard (ASTM)	European standard (EN176-1991)	Our standard
Mohs hardness	5	5	≥6
Glazed(abrasion grade)	1~4	1~4	≥3
Unglaze(abrasion volume)	≤205mm²	≤205mm²	≤135mm²

Thermal linear expansion coefficient(lower value,better quality)

Feature

American standard

(ASTM)

European standard

(EN176-1991)

Our standard

Index

≤9

≤9

≤6

Stain resistance(higher value,better quality)

Feature

American standard

(ASTM)

European standard

(EN176-1991)

Our standard

Stain resistance

Water clean

≥2

≥4

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