Sulfur dioxide
ALDRICH/295698 - ≥99.9%
Synonym: Sulfurous anhydride; Sulfurous oxide; Sulphur dioxide
CAS Number: 7446-09-5
Empirical Formula (Hill Notation): O2S
Molecular Weight: 64.06
EC Number: 231-195-2
MDL Number: MFCD00011450
Linear Formula: SO2
Product Type: Chemical
| assay | ≥99.9% |
| bp | −10 °C (lit.) |
| density | 1.25 g/mL at 25 °C (lit.) |
| InChI | 1S/O2S/c1-3-2 |
| InChI key | RAHZWNYVWXNFOC-UHFFFAOYSA |
| mp | −73 °C (lit.) |
| Quality Level | 200  |
| SMILES string | O=S=O |
| vapor density | 2.26 (21 °C, vs air) |
| vapor pressure | 1779 mmHg ( 21 °C) |
| Application: | Sulfur dioxide is primarily used as a feedstock for the production of sulfuric acid (contact process). It is generally used in the synthesis of a variety of sulfur-containing organic compounds like alkyl/aryl sulfonyl chlorides, sulfinates, sultines, and polysulfone. |
| Legal Information: | Aldrich is a registered trademark of Sigma-Aldrich Co. LLC |
| Other Notes: | See Technical Information Bulletin AL-151 Gas Regulators: Selection, Installation, and Operation |
| Packaging: | 454 g in steel cylinder |
| Packaging: | Supplied in a carbon steel lecture bottle with a CGA180M/CGA110F needle valve installed. Compatible with the following:• Aldrich® lecture-bottle station systems • Aldrich® lecture-bottle gas regulators |
| Symbol |    GHS04,GHS05,GHS06 |
| Signal word | Danger |
| Hazard statements | H280 - H314 - H331 |
| Precautionary statements | P260 - P280 - P301 + P330 + P331 - P303 + P361 + P353 - P304 + P340 + P311 - P305 + P351 + P338 + P310 |
| Hazard Codes | T |
| Risk Statements | 23-34 |
| Safety Statements | 9-26-36/37/39-45 |
| RIDADR | UN1079 - class 2 - Sulfur dioxide |
| WGK Germany | WGK 1 |
| Purity | ≥99.9% |
| bp | −10 °C (lit.) |
| mp | −73 °C (lit.) |
| Density | 1.25 g/mL at 25 °C (lit.) |
| UNSPSC | 12142100 |