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NIOSH

n-BUTYL MERCAPTAN

ICSC: 0018

1-Butanethiol
Butyl mercaptan
Thiobutyl alcohol
C4H10S / CH3(CH2)3SH
Molecular mass: 90.2
ICSC # 0018 		CAS # 109-79-5
RTECS # EK6300000
UN # 2347
December 04, 2000 Validated

TYPES OF HAZARD/ EXPOSURE

ACUTE HAZARDS/ SYMPTOMS

PREVENTION

FIRST AID/
FIRE FIGHTING

FIRE Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire.
NO open flames, NO sparks, and NO smoking.
Alcohol-resistant foam, powder, carbon dioxide.
EXPLOSION Vapour/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling.
In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE
STRICT HYGIENE!

•INHALATION Weakness. Confusion. Cough. Dizziness. Drowsiness. Headache. Nausea. Vomiting. Shortness of breath.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Artificial respiration may be needed. Refer for medical attention.
•SKIN Redness. Pain.
Protective gloves.
Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
•EYES Redness. Pain.
Safety goggles or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
•INGESTION (See Inhalation).
Do not eat, drink, or smoke during work.
Rinse mouth. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Evacuate danger area! Remove all ignition sources. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. Do NOT let this chemical enter the environment. Chemical protection suit including self-contained breathing apparatus.
Fireproof. Separated from strong oxidants, acids.

Marine pollutant.
UN Hazard Class: 3
UN Packing Group: II
ICSC: 0018 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

n-BUTYL MERCAPTAN

ICSC: 0018

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PHYSICAL STATE; APPEARANCE:
COLOURLESS TO YELLOW LIQUID , WITH CHARACTERISTIC ODOUR.

PHYSICAL DANGERS:
The vapour is heavier than air and may travel along the ground; distant ignition possible.

CHEMICAL DANGERS:
The substance decomposes on heating producing toxic fumes ( sulfur oxides - see ICSC0074). Reacts with acids , bases and strong oxidants .

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 0.5 ppm as TWA; (ACGIH 2004).
MAK: 0.5 ppm, 1.9 mg/m3;
Peak limitation category: II(2); Pregnancy risk group: C;
(DFG 2007).
OSHA PEL†: TWA 10 ppm (35 mg/m3)
NIOSH REL: C 0.5 ppm (1.8 mg/m3) 15-minute
NIOSH IDLH: 500 ppm See: 109795


ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes, the skin and the respiratory tract. The substance may cause effects on the thyroid. Exposure far above the OEL may cause effects on the nervous system and could cause lowering of consciousness.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:

PHYSICAL
PROPERTIES

Boiling point: 98°C
Melting point: -116°C
Relative density (water = 1): 0.83
Solubility in water, g/100 ml: 0.06
Vapour pressure, kPa at 20°C: 4.0
Relative vapour density (air = 1): 3.1
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.2
Flash point:
2°C c.c.
Auto-ignition temperature: below 225°C
Explosive limits, vol% in air: 1.4-10.2
Octanol/water partition coefficient as log Pow: 2.28

ENVIRONMENTAL
DATA

The substance is toxic to aquatic organisms.

N O T E S

Card has been partly updated in October 2004. See sections Occupational Exposure Limits, EU classification, Emergency Response.
Transport Emergency Card: TEC (R)-30GF1-I+II

NFPA Code: H2; F3; R0
Card has been partially updated in January 2008: see Fire fighting.

ADDITIONAL INFORMATION



ICSC: 0018 n-BUTYL MERCAPTAN
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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