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High-concentration colloidal silica
GS-40, GS-35 are two types of high-concentration colloidal silica. Their technical standards are listed below:
| Designation | Standard | |
| GS-40 | GS-35 | |
| Appearance | Slight milky transparent to translucent liquid | |
| SiO2 (wt%) | 40±1% | 35±1% |
| Na2O (wt%) | ≤0.7% | ≤0.5% |
| PH (20°C) | 9.5-11.0 | |
| Density (20°C, g/cm3) | 1.28-1.295 | 1.24-1.25 |
| Viscosity(25°C, mPa•S) | ≤35 | ≤20 |
| Particle size (nm) | 8-15 | |
| Stability | Six months | |
