STANDARD USED

 REQUIREMENTS

 RESULTS

TOLERANCE OF THE SURFACE FLATNESS (JC/T 872--2000) 

≤ 1.0MM 

0.17MM 

TOLERANCE OF THE ANGLE (JC/T 872--2000)

≤ 0.6MM

0.26MM

SPECULAR GLOSS (JC/T 872--2000)

≥ 85

97~99

MOHS' HARDNESS (JC/T 872--2000)

5～6

6

BREAKING STRENGTH (JC/T 872--2000)

≥ 30MPa

39.3MPa

COLOR DIFFERENCE (JC/T 872--2000)

BASICALLY THE SAME

CONFORMED

THERMAL SHOCK RESISTANCE (JC/T 872--2000)

NO CRACKS APPEAR AFTER THE THERMAL SHOCK TEST

CONFORMED

RESISTANCE TO ACIDS (JC/T 872--2000)

MASS LOSS MAXIMUM 0.2％

0.04%

 THE APPEARANCE SHOWS NO DIFFERENCE

RESISTANCE TO ALKALIS (JC/T 872--2000)

MASS LOSS MAXIMUM 0.2％

0.03%

 THE APPEARANCE SHOWS NO DIFFERENCE