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
R 11 20 50/53
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

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)
Odor Threshold Odor threshold 0.47 ppb
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.
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.
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
Hazard class
3
Packing Group
I
 
USCG CHRIS Code
EMC
 
HS Code
2930 90 70
 
Std. Transport #
4908169