Ethyl mercaptan

  • Ethanethiol
  • Ethyl sulfhydrate
  • Thioethyl alcohol
Formula C2H5SH
Structure
Description Colorless liquid with one of the most penetrating and persistent, leek- or garlic-like odors known.
Uses Intermediate & starting material in manufacture of plastics, insecticides, antioxidants, odorant for natural gas.

Registry Numbers and Inventories.
CAS 75-08-1
EC (EINECS/ELINCS) 200-837-3
EC Index Number 016-022-00-9
EC Class Highly flammable; Harmful; Dangerous for the Environment
EC Risk Phrase R 11 20 50/53
EC Safety Phrase S 16 25 60 61
RTECS KI9625000
RTECS class Primary Irritant
UN (DOT) 2363
Merck 12,3771
Beilstein/Gmelin 773638
Beilstein Reference 4-01-00-01390
Swiss Giftliste 1 G-1190
Canada DSL/NDSL DSL
US TSCA Listed
Austrailia AICS Listed
New Zealand Listed
Japan ENCS (MITI) Listed
Korea ECL Listed

Odor Threshold Odor threshold 0.47 ppb
Properties.
Formula C2H6S
Formula mass 62.13
Melting point, °C -148
Boiling point, °C 35
Vapor pressure, mmHg 442 (20 C)
Vapor density (air=1) 2.14
Saturation Concentration 581,700 ppm (58.2%) (calculated)
Evaporization number 24.9 (n-butyl acetate = 1)
Critical temperature 225.5
Critical pressure 54.2
Density 0.846 g/cm3 (20 C)
Solubility in water 6.8 g/L
Viscosity 0.3155 cp (20 C)
Surface tension 23.63 g/s2 @ 2 C
Refractive index 1.4365 (20 C)
pKa/pKb 10.61 (pKa)
Partition coefficient, pKow 1.25
Heat of fusion 4.9 kJ/mol
Heat of vaporization 27.5 kJ/mol
Heat of combustion -2165 kJ/mol

Hazards and Protection.
Storage Keep away from heat, sparks, and flame. Keep away from sources of ignition. Keep refrigerated. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
WHMIS B2
Handling Wash thoroughly after handling. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Do not ingest or inhale. Use only in a chemical fume hood. This product may be under pressure; cool before opening. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition. A vapor suppressing foam may be used to reduce vapors. Water spray may reduce vapor but may not prevent ignition in closed spaces.
Disposal code 6
Stability Stable under normal temperatures and pressures.
Incompatibilities Oxidizing agents, calcium hypochlorite.
Decomposition Carbon monoxide, oxides of sulfur, carbon dioxide.

Fire.
Flash Point,°C -45
Autoignition, °C 295
Upper exp. limit, % 18.2
Lower exp. limit, % 2.8
Fire fighting Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Extremely flammable liquid. Containers may explode in the heat of a fire. May accumulate static electrical charges, and may cause ignition of its own vapors. Extinguishing media: Use water spray to cool fire-exposed containers. Water may be ineffective. Do NOT get water inside containers. For large fires, use water spray, fog or regular foam. For small fires, use dry chemical, carbon dioxide, water spray or regular foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential Dangerous, when exposed to heat or flame or oxidizers. Minimum ignition temperature in air: 299 C; in oxygen: 261 C can react vigorously with oxidizing materials.
Hazards Vapor is heavier than air and may travel long distance to a source of ignition and flash back; containers may explode in a fire.
Combustion products Irritating fumes of sulfur dioxide are generated.
NFPA Health 2
  Flammability 4  
  Reactivity 1  

Health.
Exposure limit(s) TLV: 0.5 ppm; 1.3 mg/m3 (ACGIH 1995-1996). OSHA PEL: C 10 ppm (25 mg/m3) NIOSH REL: C 0.5 ppm (1.3 mg/m3) 15-minute NIOSH IDLH: 500 ppm
Poison_Class 4
Exposure effects Chronic ingestion may cause neurological symptoms.
   Ingestion May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed. May cause central nervous system effects.
   Inhalation Harmful if inhaled. Inhalation of high concentrations may cause central nervous system effects characterized by headache, dizziness, unconsciousness and coma. Causes respiratory tract irritation. May cause nausea, dizziness, and headache.
   Skin May cause skin irritation.
   Eyes Causes eye irritation.

First aid
 
   Ingestion If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin Get medical aid. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number 2363
Response guide 130
Hazard class 3
Packing Group I  
USCG CHRIS Code EMC  
USCG Compatatibility Group 30 Olefins
HS Code 2930 90 70  
Std. Transport # 4908169