493-52-7
| Name | Methyl Red |
| CAS | 493-52-7 |
| EINECS(EC#) | 207-776-1 |
| Molecular Formula | C15H15N3O2 |
| MDL Number | MFCD00002425 |
| Molecular Weight | 269.3 |
| MOL File | 493-52-7.mol |
Chemical Properties
| Appearance | dark red crystalline powder |
| Melting point | 178-182°C |
| Boiling point | 412.44°C (rough estimate) |
| bulk density | 300-500kg/m3 |
| density | 0.839 g/mL at 25 °C |
| vapor density | 9.3 (vs air) |
| refractive index | 1.5930 (estimate) |
| Fp | 11 °C |
| storage temp. | −20°C |
| solubility | ethanol: soluble1mg/mL |
| Colour Index | 13020 |
| form | Solid |
| pka | 4.95(at 25℃) |
| color | Reddish-violet |
| Odor | Odorless |
| PH Range | 4.4(red)-6.3(yellow) |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| Water Solubility | Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water. |
| ε(extinction coefficient) | ≥10000 at 282-288nm in methanol ≥20000 at 509-519nm in methanol ≥7000 at 329-335nm in methanol |
Safety Data
| Symbol(GHS) |    GHS02,GHS07,GHS08 |
| Signal word | Danger |
| Hazard statements | H225-H319-H371 |
| Precautionary statements | P210-P260-P280-P308+P311-P337+P313-P403+P235 |
| Hazard Codes | Xn,T,F,Xi,C,N |
| Risk Statements | |
| Safety Statements | |
| RIDADR | UN 1170 3/PG 2 |
| WGK Germany | 1 |
| RTECS | DG8960000 |
| TSCA | Yes |
| HazardClass | 3 |
| PackingGroup | II |
| HS Code | 29270000 |
| Safety Profile | |
| Hazardous Substances Data | 493-52-7(Hazardous Substances Data) |