Chamotte is a calcined clay. The calcination process takes place in a rotary kiln at high temperatures of 1400 - 1600ºC. Sanitaryware pieces are fired at lower temperatures of around 1200ºC, therefore the chamotte is inert at the firing stage and acts like a skeleton to produce ware with better proprieties. Grog is composed of 40% minimum alumina, 30% minimum silica, 4% maximum iron(III) oxide, up to 2% calcium oxide and magnesium oxide combined. Its melting point is approximately 1,780 °C (3,240 °F). Its boiling point is over 9,000 °C (16,230 °F). Its water absorption is maximum 7%. Its thermal expansion coefficient is 5.2 mm/m and thermal conductivity is 0.8 W/(m•K) at 100 °C and 1.0 W/(m•K) at 1000 °C.
Specification :
| PRODUCT - SPECIFICATION SHEET |
| Chemical Analysis Grade - I |
| Parameters |
Guaranteed
(%) |
Typical (%) |
| Al2O3 |
Min-42 |
42-43 |
| SiO2 |
|
53-54 |
| Fe2O3 |
|
1.2 max |
| TiO2 |
|
3% max |
| CaO |
|
0.5% max |
| Mg0 |
|
0.05-0.1 |
| LOl |
|
0.5-0.7 |
| BD gm/cc min |
|
2.6 |
|
| PRODUCT - SPECIFICATION SHEET |
| Chemical Analysis Grade - II |
| Parameters |
Guaranteed
(%) |
Typical (%) |
| Al2O3 |
Min-42 |
48-49 |
| SiO2 |
|
52-53 |
| Fe2O3 |
|
1.5 max |
| TiO2 |
|
3% max |
| CaO |
|
1.5% max |
| Mg0 |
|
0.05-0.1 |
| LOl |
|
0.5-0.7 |
| BD gm/cc min |
|
2.5 |
|
| PRODUCT - SPECIFICATION SHEET |
| Chemical Analysis Grade - III |
| Parameters |
Guaranteed
(%) |
Typical (%) |
| Al2O3 |
Min-42 |
54-56 |
| SiO2 |
|
50-52 |
| Fe2O3 |
|
2 max |
| TiO2 |
|
3.5% max |
| CaO |
|
2.5% max |
| Mg0 |
|
0.05-0.1 |
| LOl |
|
0.5-0.7 |
| BD gm/cc min |
|
2.7 |
|
