SiO₂

Al₂O₃

K₂O+Na₂O

MgO

CaO

TiO₂

9% Max.

90% Min.

0.2% Max.

Microscale

0.2% Max.

Microscale

Fe₂O₃

Volume Density (g/cm³)

Apparent porosity

Cold compressive strength (21℃)

Flexural Strength (21℃)

Flexural Strength (1500℃)

0.3% Max.

3.0 Min.

19% Max.

8Mpa Min.

8Mpa Min.

3Mpa Min.

Heavy firing lin change (1700℃)

　+1.2% Max.

Refractoriness under load (0.2Mpa/cm³)

　1700 ℃ Min.

Creep rate

0.4% Max.