Methyl mercaptan (Methanethiol)
NIOSH Potential Occupational Carcinogen
Flame
Gas Cylinder
Skull and Crossbones
Exclamation Mark
Health Hazard
Hazard Statements
| Code | Statement | Hazard Class |
|---|---|---|
H220 |
Extremely flammable gas | Flammable gases |
H280 |
Contains gas under pressure; may explode if heated | Gases under pressure |
H315 |
Causes skin irritation | Skin corrosion/irritation |
H319 |
Causes serious eye irritation | Serious eye damage/eye irritation |
H331 |
Toxic if inhaled | Acute toxicity, inhalation |
H336 |
May cause drowsiness or dizziness | Specific target organ toxicity, single exposure; Narcotic effects |
H370 |
Causes damage to organs | Specific target organ toxicity, single exposure |
H372 |
Causes damage to organs through prolonged or repeated exposure | Specific target organ toxicity, repeated exposure |
Precautionary Statements
| Code | Statement |
|---|---|
P203 |
Obtain, read and follow all safety instructions before use. |
P210 |
Keep away from heat, hot surface, sparks, open flames and other ignition sources. No smoking. |
P222 |
Do not allow contact with air. |
P260 |
Do not breathe dust/fume/gas/mist/vapors/spray. |
P261 |
Avoid breathing dust/fume/gas/mist/vapors/spray. |
P264 |
Wash hands [and ...] thoroughly after handling. |
P264+P265 |
Wash hands [and ...] thoroughly after handling. Do not touch eyes. |
P270 |
Do not eat, drink or smoke when using this product. |
P271 |
Use only outdoors or in a well-ventilated area. |
P280 |
Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/... |
P302+P352 |
IF ON SKIN: wash with plenty of water/... |
P304+P340 |
IF INHALED: Remove person to fresh air and keep comfortable for breathing. |
P305+P351+P338 |
IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do - continue rinsing. |
P308+P316 |
IF exposed or concerned: Get emergency medical help immediately. |
P316 |
Get emergency medical help immediately. |
P319 |
Get medical help if you feel unwell. |
P321 |
Specific treatment (see information on this label and safety datasheet)). |
P332+P317 |
If skin irritation occurs: Get medical help. |
P337+P317 |
If eye irritation persists: Get medical help. |
P362+P364 |
Take off contaminated clothing and wash it before reuse. |
P377 |
Leaking gas fire: Do not extinguish, unless leak can be stopped safely. |
P381 |
In case of leakage, eliminate all ignition sources. |
P403 |
Store in a well-ventilated place. |
P403+P233 |
Store in a well-ventilated place. Keep container tightly closed. |
P405 |
Store locked up. |
P410+P403 |
Protect from sunlight. Store in a well-ventilated place. |
P501 |
Dispose of contents/container to ... |
Exposure Limits
| NIOSH REL | Ceiling: 0.5 ppm |
| NIOSH IDLH | 150 ppm |
| Skin Notation | Yes — can be absorbed through skin |
Physical Properties
Colorless gas with a disagreeable odor like garlic or rotten cabbage.
| Boiling Point | 42.7°F |
| Flash Point | 0°F |
| Vapor Pressure | 1.7 atm |
| Specific Gravity | 0.90 at 42.8°F |
NFPA 704 Diamond
4
4
1
Health
Fire
Reactivity
Target Organs
irritation, eye, skin, blood, and nervous system effects
Synonyms
mercaptomethane; methanethiol; methyl sulfhydrate
Data Sources
- GHS Classification: PubChem CID 878
- NIOSH REL/IDLH: NIOSH Pocket Guide
Disclaimer: This information is compiled from public regulatory databases for reference only. It does not replace the manufacturer's Safety Data Sheet (SDS). Always consult the official SDS for your specific product before handling chemicals.
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