FINE-SIL520A Silica
FINE-SIL520A Silica for Toothpaste is an amorphous powder, odorless, insoluble in water or acid, and chemically inert. It has good compatibility with fluorides and other raw materials in toothpaste. The structure and particle size of silica can be controlled by production conditions. According to different types of toothpaste, three products are produced: Abrasive Type, Hybrid Type, and Thickening Type.
FINE-SIL520A series products have been tested and meet the Light Industry Standard of the People's Republic of China QB/T2346-97.
| Item | Abrasive Type | Hybrid Type | Thickening Type |
|---|---|---|---|
| SiO₂ Content (%) | ≥95 | ≥98 | ≥98 |
| Appearance | White powder, no impurities by visual inspection | White powder, no impurities by visual inspection | White powder, no impurities by visual inspection |
| Whiteness (WG) % | ≥93 | ≥98 | ≥98 |
| pH (5% Aqueous Dispersion) | 6.5-8.5 | 6.5-8.5 | 6.5-8.5 |
| Through 320 Mesh (%) | ≥98 | ≥99 | ≥99 |
| Volatile Matter at 1050℃ (%) | ≤10 | ≤10 | ≤10 |
| Loss on Drying & Ignition (900℃) % | ≤8.3 | ≤6 | ≤6 |
| Water Absorption Value (m/20g) | 17-20 | 30-42 | 45-60 |
| Sulfate (as Na₂SO₄) % | ≤0.4 | ≤0.4 | ≤0.4 |
| Chloride (as NaCl) % | ≤0.1 | ≤0.1 | ≤0.1 |
| Sulfide | None | None | None |
| Heavy Metal (as Pb) Content (mg/kg) | ≤20 | ≤20 | ≤20 |
| Arsenic (As) Content (mg/kg) | ≤2 | ≤2 | ≤2 |
| Total Bacterial Count (cfu/g) | ≤200 | ≤200 | ≤200 |