A7300312
Silicon Standard , SP , 7440-21-3
CAS NO.：7440-21-3
Empirical Formula: H4Si
Molecular Weight: 32.12
MDL number: MFCD00085311
EINECS: 231-130-8
Update time: 2022-07-08
PRODUCT Properties
| Melting point: | 1410 °C(lit.) |
| Boiling point: | 2355 °C(lit.) |
| bulk density | 0.07-0.08g/cm3 |
| Density | 2.33 g/mL at 25 °C(lit.) |
| Flash point: | 2.33 |
| storage temp. | Flammables area |
| solubility | insoluble in H2O, acid solutions; soluble in alkaline solutions |
| form | powder |
| Specific Gravity | 2.42 |
| color | White |
| PH | 13.5 (H2O, 20°C) |
| Odor | Odorless |
| Water Solubility | INSOLUBLE |
| semiconductor properties | <111>P-type |
| Crystal Structure | Cubic, Diamond Structure - Space Group Fd3m |
| Sensitive | Air Sensitive |
| Merck | 13,8565 |
| Exposure limits | ACGIH: TWA 2.5 mg/m3 NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 |
| Dielectric constant | 2.4（Ambient） |
| Stability: | Stable. Fine powder is highly flammable. Incompatible with oxidizing agents, bases, carbonates, alkali metals, lead and aluminium oxides, halogens, carbides, formic acid. |
| Cosmetics Ingredients Functions | ABRASIVE |
| InChI | 1S/Si |
| InChIKey | BLRPTPMANUNPDV-UHFFFAOYSA-N |
| SMILES | [Si] |
| Shear Modulus | 43.9 GPa, Calculated |
| Bulk Modulus | 98.74 GPa |
| Hardness, Mohs | 7.0 |
| Modulus of Elasticity | 112.4 GPa |
| Poissons Ratio | 0.28 |
| Knoop Microhardness | 11270, N/mm2 Microhardness |
| CAS DataBase Reference | 7440-21-3(CAS DataBase Reference) |
| NIST Chemistry Reference | Silicon(7440-21-3) |
| EPA Substance Registry System | Silicon (7440-21-3) |
Description and Uses
In making silanes and silicones, the Si-C bond being about as strong as a C-C bond. In the manufacture of transistors, silicon diodes and similar semiconductors. For making alloys such as ferrosilicon, silicon bronze, silicon copper. As a reducing agent like aluminum in high tempereture reactions.
Safety
| Symbol(GHS) |  GHS02 |
| Signal word | Warning |
| Hazard statements | H228 |
| Precautionary statements | P210-P240-P241-P280-P370+P378 |
| PPE | Eyeshields, Gloves, type N95 (US) |
| Hazard Codes | T,F |
| Risk Statements | 11 |
| Safety Statements | 26-36/37-45-7/9-33-16-36 |
| RIDADR | UN 2922 8/PG 2 |
| OEB | B |
| OEL | TWA: 10 mg/m3 (total) |
| WGK Germany | 2 |
| RTECS | VW0400000 |
| Autoignition Temperature | 780°C |
| TSCA | TSCA listed |
| HS Code | 3822 00 00 |
| HazardClass | 4.1 |
| PackingGroup | III |
| Storage Class | 4.1B - Flammable solid hazardous materials |
| Hazard Classifications | Flam. Sol. 2 |
| Hazardous Substances Data | 7440-21-3(Hazardous Substances Data) |
| Limited Quantities | 5.0 Kg (11 lbs) (solid) |
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (1Kg or 1L) |
