Products Description of Silicon Dioxide CAS#7631-86-9
Silicon dioxide is a naturally occurring compound that is widely distributed throughout the Earth. As one of the most significant oxide materials, it accounts for approximately 60% of the Earth’s crust, existing either in its pure form as silica or combined with metal oxides to form silicate minerals. It is commonly found in natural resources such as sand, rocks, minerals, and deposits along oceans, rivers, and deserts. Silicon dioxide exists in various structural forms, including crystalline silica with different polymorphs, synthetic quartz, amorphous silica, and fused (vitreous) silica. In addition, specially engineered silica materials can be produced through synthetic processes to meet the requirements of various industrial applications.
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Silicon Dioxide CAS#7631-86-9 Chemical Properties
| Melting point | >1600 °C(lit.) |
| Boiling point | >100 °C(lit.) |
| Density | 2.2-2.6 g/mL at 25 °C |
| Bulk density | 200-800kg/m3 |
| Vapor pressure | 13.3hPa at 1732℃ |
| Refractive index | 1.46 |
| Fp | 2230°C |
| Storage temp | 2-8°C |
| Solubility | Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides. |
| Form | Suspension |
| Pka | 6.65-9.8[at 20 ℃] |
| Specific Gravity | 2.2 |
| Color | White to yellow |
| Odor | at 100.00?%. odorless |
| PH | 5-8 (100g/l, H2O, 20℃)(slurry) |
| Resistivity | 1∞10*20 (ρ/μΩ.cm) |
| Water Solubility | insoluble |
| Sensitive | Hygroscopic |
| Hydrolytic Sensitivity | 6: forms irreversible hydrate |
| Crystal Structure | Trigonal |
| Merck | 14,8493 |
| Exposure limits | NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3 |
| Stability: | Stable. |
| CAS DataBase Reference | 7631-86-9(CAS DataBase Reference) |
| NIST Chemistry Reference | Silicon(iv) oxide(7631-86-9) |
| IARC | 3 (Vol. Sup 7, 68) 1997 |
| EPA Substance Registry System | Silica (7631-86-9) |
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Product Application of Silicon Dioxide CAS#7631-86-9
Silica, also known as silicon dioxide, is widely used in various formulations due to its multifunctional properties. It can act as a viscosity modifier, bulking agent, opacifying agent, and abrasive material. In addition, silica can serve as a carrier for emollients and improve the texture and sensory feel of finished products. Spherical silica features a porous structure and excellent oil-absorbing capacity, allowing it to absorb approximately 1.5 times its own weight, making it highly effective in controlling excess oil. It is commonly used in sunscreens, exfoliating products, skincare formulations, cosmetics, and hair care products, and is suitable for hypoallergenic and allergy-tested applications.
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