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For surface layer
The particle size of this product is smaller than general products, so it's propitious to increase compactness of the shells' surface.
| Designation | Standard | |
| Type | GS-302 | GS-304 |
| Appearance | Slight milky transparent to translucent | |
| SiO2 (wt%) | 29.5-31.0 | 30.0-31.5 |
| Na2O (wt%) | ≤0.5% | |
| PH (20°C) | 9.5-11.0 | |
| Density (20°C，g/cm3) | 1.19-1.21 | |
| Viscosity (20°C，mPa•S) | ≤10 | |
| Particle size (nm) | 8-11 | |
| Stability | Two years | |
