Hydroquinone
SIAL/H3660 - meets USP testing specifications
Synonym: 1,4-Benzenediol; 1,4-Dihydroxybenzene; HQ
CAS Number: 123-31-9
Empirical Formula (Hill Notation): C6H6O2
Molecular Weight: 110.11
EC Number: 204-617-8
MDL Number: MFCD00002339
Linear Formula: C6H4-1,4-(OH)2
Product Type: Chemical
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: H3660-100G
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: H3660-5G
| agency | meets USP testing specifications |
| USP/NF | |
| application(s) | pharmaceutical (small molecule) |
| assay | 99.0-100.5% anhydrous basis |
| autoignition temp. | 930 °F |
| bp | 285 °C (lit.) |
| InChI | 1S/C6H6O2/c7-5-1-2-6(8)4- |
| InChI key | QIGBRXMKCJKVMJ-UHFFFAOYSA |
| mp | 172-175 °C (lit.) |
| Quality Level | 200  |
| SMILES string | Oc1ccc(O)cc1 |
| suitability | suitable for pesticide residue analysis |
| vapor density | 3.81 (vs air) |
| vapor pressure | 1 mmHg ( 132 °C) |
| Packaging: | 5, 100 g in glass bottle |
| Symbol |     GHS05,GHS07,GHS08,GHS09 |
| Signal word | Danger |
| Hazard statements | H302 - H318 - H341 - H351 - H410 |
| Precautionary statements | P202 - P273 - P280 - P301 + P312 - P305 + P351 + P338 - P308 + P313 |
| Hazard Codes | Xn,N |
| Risk Statements | 22-40-41-43-50-68 |
| Safety Statements | 26-36/37/39-61 |
| RIDADR | UN 3077 9 / PGIII |
| WGK Germany | WGK 3 |
| Flash Point(F) | 329.0 °F - closed cup |
| Flash Point(C) | 165 °C - closed cup |
| Purity | 99.0-100.5% anhydrous basis |
| bp | 285 °C (lit.) |
| mp | 172-175 °C (lit.) |
| UNSPSC | 41116107 |