°C

1350 - 1800

CaO

<1.5

Specific heat

Cal/g°C

0.15-0.2

Na2O

<1.5

Quenching test

_

800 - 20 do not crack for three times

MgO

<1

Acid resistance

%

>98

K2O

<2.5

Alkali resistance

%

>88

Others

Hardness

Mohs

>6.5

——