ICSC 0018 - n-BUTYL MERCAPTAN

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n-BUTYL MERCAPTAN	ICSC: 0018 (December 2000)
1-Butanethiol Butyl mercaptan Thiobutyl alcohol

CAS #: 109-79-5

UN #: 2347

EC Number: 203-705-3

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

STRICT HYGIENE!
	SYMPTOMS	PREVENTION	FIRST AID
Inhalation	Weakness. Confusion. Cough. Dizziness. Drowsiness. Headache. Nausea. Vomiting. Shortness of breath.	Use 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.	Wear 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 refer for medical attention.
Ingestion	See Inhalation.	Do not eat, drink, or smoke during work.	Rinse mouth. Refer for medical attention .

SPILLAGE DISPOSAL	CLASSIFICATION & LABELLING
Evacuate danger area! Personal protection: chemical protection suit including self-contained breathing apparatus. Remove all ignition sources. Do NOT let this chemical enter the environment. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Do NOT wash away into sewer.	According to UN GHS Criteria Transportation UN Classification UN Hazard Class: 3; UN Pack Group: II
STORAGE
Fireproof. Separated from strong oxidants and acids.
PACKAGING
Marine pollutant.

n-BUTYL MERCAPTAN

ICSC: 0018

PHYSICAL & CHEMICAL INFORMATION
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 Decomposes on heating. This produces toxic fumes of sulfur oxides (see ICSC 0074). Reacts with acids, bases and strong oxidants.	Formula: C₄H₁₀S / CH₃(CH₂)₃SH Molecular mass: 90.2 Boiling point: 98°C Melting point: -116°C Relative density (water = 1): 0.83 Solubility in water, g/100ml: 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: <225°C Explosive limits, vol% in air: 1.4-10.2 Octanol/water partition coefficient as log Pow: 2.28

PHYSICAL & CHEMICAL INFORMATION

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
Decomposes on heating. This produces toxic fumes of sulfur oxides (see ICSC 0074). Reacts with acids, bases and strong oxidants.

Formula: C₄H₁₀S / CH₃(CH₂)₃SH
Molecular mass: 90.2
Boiling point: 98°C
Melting point: -116°C
Relative density (water = 1): 0.83
Solubility in water, g/100ml: 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: <225°C
Explosive limits, vol% in air: 1.4-10.2
Octanol/water partition coefficient as log Pow: 2.28

EXPOSURE & HEALTH EFFECTS
Routes of exposure The substance can be absorbed into the body by inhalation. Effects of short-term exposure The substance is irritating to the eyes, skin and respiratory tract. The substance may cause effects on the thyroid. Exposure far above the OEL could cause effects on the nervous system and lowering of consciousness.	Inhalation risk A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. Effects of long-term or repeated exposure

EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation.

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. The substance may cause effects on the thyroid. Exposure far above the OEL could cause effects on the nervous system and lowering of consciousness.

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

Effects of long-term or repeated exposure

OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.5 ppm as TWA. MAK: 3.7 mg/m³; peak limitation category: II(2); pregnancy risk group: C; skin absorption (H); sensitization of skin (SH)

ENVIRONMENT
The substance is toxic to aquatic organisms.

NOTES

ADDITIONAL INFORMATION

EC Classification

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