SDTECH Hardener is a colloidal silica compound used to treat the surfaces of ceramic fiber and other refractory materials. It forms a hardened layer of uniform thickness to improve surface hardness and wind-erosion resistance, extending the service life of refractory materials.
The hardener can be applied by spraying or brushing, and should not be used in low-temperature or freezing conditions.

| Division | SD 1200 |
|---|---|
| Classification Temperature(℃) | 1,400 |
| Density(kg/m³) | 1,150 - 1,400 |
| Coverage Rate (kg/m²) | 2 -6 |
| Packaging | 20kg / bucket |