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Butanethiol structure
Chemical Name:
n-C4H9SH;FEMA 3478;Butylthiol;NCI-C60866;Bear skunk;thiobutanol;BUTANETHIOL;n-Butylthiol;MERCAPTAN C4;1-BUTANETHIOL
Molecular Formula:
Formula Weight:
MOL File:

Butanethiol Properties

Melting point:
−116 °C(lit.)
Boiling point:
98 °C(lit.)
0.842 g/mL at 25 °C(lit.)
vapor density 
3.1 (vs air)
vapor pressure 
83 mm Hg ( 37.7 °C)
refractive index 
n20/D 1.443(lit.)
Flash point:
55 °F
storage temp. 
Flammables area
11.51 at 25 °C (23.0% aqueous tert-butyl alcohol, Friedman et al., 1965)
Specific Gravity
Strong skunk-like.
explosive limit
Water Solubility 
0.60 g/100 mL. Slightly soluble
Air Sensitive
JECFA Number
Henry's Law Constant
(x 10-3 atm?m3/mol): 7.04 at 20 °C (approximate - calculated from water solubility and vapor pressure)
Exposure limits
NIOSH REL: 15-min ceiling 0.5 ppm (1.8 mg/m3), IDLH 500 ppm; OSHA PEL: TWA 10 ppm (35 mg/m3); ACGIH TLV: TWA 0.5 ppm (adopted).
Stable. Incompatible with oxidizing agents, bases, alkali metals. Highly flammable. May discolour on exposure to air.
CAS DataBase Reference
109-79-5(CAS DataBase Reference)
NIST Chemistry Reference
EPA Substance Registry System
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H302-H332-H225-H302+H332-H315-H317-H319-H335-H320-H336-H361-H371
Precautionary statements  P201-P202-P233-P240-P241+P242+P243-P260-P264-P270-P271-P301+P312+P330-P303+P361+P353-P304+P340+P312-P305+P351+P338+P337+P313-P308+P311-P370+P378-P403+P233-P405-P280h-P403-P210-P261-P280-P305+P351+P338
Hazard Codes  F,Xn
Risk Statements  11-20/22-36/37/38-21/22-43
Safety Statements  16-23-26-36-9-36/37-33-37-37/39
RIDADR  UN 2347 3/PG 2
WGK Germany  3
RTECS  EK6300000
HS Code  2930 90 98
HazardClass  3
PackingGroup  II
Toxicity LD50 orally in Rabbit: 1500 mg/kg

NFPA 704

Diamond Hazard Value Description
1 0
Health   1 Exposure would cause irritation with only minor residual injury (e.g. acetone, sodium bromate, potassium chloride)
Flammability   3 Liquids and solids (including finely divided suspended solids) that can be ignited under almost all ambient temperature conditions . Liquids having a flash point below 22.8 °C (73 °F) and having a boiling point at or above 37.8 °C (100 °F) or having a flash point between 22.8 and 37.8 °C (73 and 100 °F). (e.g. gasoline, acetone)
Instability   0 Normally stable, even under fire exposure conditions, and is not reactive with water (e.g. helium,N2)

(NFPA, 2010)

Butanethiol price More Price(12)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 112925 1-Butanethiol 99% 109-79-5 250ml $35.4 2018-11-13 Buy
Sigma-Aldrich 112925 1-Butanethiol 99% 109-79-5 1l $96.2 2018-11-13 Buy
TCI Chemical B0685 1-Butanethiol >97.0%(GC) 109-79-5 25mL $14 2018-11-22 Buy
TCI Chemical B0685 1-Butanethiol >97.0%(GC) 109-79-5 500mL $44 2018-11-22 Buy
Alfa Aesar 043421 1-Butanethiol, 98% 109-79-5 25ml $15.1 2018-11-16 Buy

Butanethiol Chemical Properties,Uses,Production


Butane thiol, also known as butyl mercaptan, is a volatile, clear to yellowish liquid with a fetid (extremely foul-smelling) odor, commonly described as "skunk" odor. In fact, butanethiol is structurally similar to several major constituents of a skunk's defensive spray but is not actually present in the spray. The scent of butanethiol is so strong that the human nose can easily detect it in the air at concentrations as low as 10 parts per billion. The threshold level for 1-butane thiol is reported as 1.4 ppb.

Chemical Properties

Butanethiol is chemically classified among the thiols, which are organic compounds with molecular formulas and structural formulas similar to alcohols, except that sulfur-containing sulfhydryl group (- SH) replaces the oxygen-containing hydroxyl group in the molecule. Butanethiol's basic molecular formula is C4H9SH, and its structural formula is similar to that of the alcohol n-butanol. Butanethiol is prepared by the free radical catalyzed addition of hydrogen sulfide to 1-butene. Commercially, this is performed using ultraviolet light. Butanethiol is a thiol of low molecular weight, and it is highly flammable.

Chemical Properties

1-Butanethiol has an unpleasant (skunk) odor.

Chemical Properties

colourless liquid

Chemical Properties

Butanethiol is also known as butyl mercaptan. It is a volatile, highly flammable clear to yellowish liquid with an extremely foul-smelling, strong, garlic-, cabbageor skunk-like Butanethiol is also known as butyl mercaptan. It is a volatile, highly flammable clear to yellowish liquid with an extremely foul-smelling, strong, garlic-, cabbageor skunk-like

Physical properties

Clear, colorless liquid with a strong garlic, cabbage, or pungent skunk-like odor. Odor threshold concentrations of 0.0028 ppbv and 3.7 μg/m3 (1.0 ppbv) were reported by Katz and Talbert (1930) and Nagata and Takeuchi (1990), respectively.


Reported found in beef, cheddar cheese, raw chicken, cooked potatoes, beer and boiled eggs.


Intermediate, solvent.


Butanethiol is used as an industrial solvent , and as an intermediate for cotton defoliants. It is some times placed in the "stink bombs" and "stink perfumes" for prankster.

General Description

Butanethiol is also known as butyl mercaptan. It is a volatile, clear to yellowish liquid with an extremely foul smell, with a strong, garlic-, cabbage-, or skunk-like odour. It is slightly oily in nature. Butanethiol is used as a chemical intermediate in the production of insecticides and herbicides. It is also used as a gas odorant.

Air & Water Reactions

Highly flammable. Slightly soluble in water.

Reactivity Profile

Butanethiol is incompatible with acids, diazo and azo compounds, halocarbons, isocyanates, aldehydes, alkali metals, nitrides, hydrides, and other strong reducing agents. Reactions with these materials generate heat and in many cases hydrogen gas. May liberate hydrogen sulfide upon decomposition or reaction with an acid. Incompatible with strong oxidizing agents [USCG, 1999].


Toxic by inhalation. Flammable, dangerous fire risk. Upper respiratory tract irritant.

Health Hazard

Inhalation causes loss of sense of smell; muscular weakness. convulsions, and respiratory paralysis may follow prolonged exposure. Contact of liquid with eyes or skin causes slight irritation. Ingestion causes nausea.

Health Hazard

Exposures to butanethiol cause adverse health effects and poisoning. The symptoms of poisoning in exposed workers include, but are not limited to, asthenia, muscular weak ness, malaise, sweating, nausea, vomiting, headache, restlessness, increased respiration, incoordination, muscular weakness, skeletal muscle paralysis in most cases, heavy to mild cyanosis, lethargy and/or sedation, respiratory depression followed by coma. Severe cases of poisoning lead to death of the exposed worker. In laboratory studies, animals given intraperitoneal and oral exposures of butane thiol survived near-lethal single doses. However, after 20 days post-treatment, animals showed pathological changes involving liver and kidney damage. The pathomorpho logical changes in the liver included cloudy swelling, fatty degeneration, and necrosis. Pathological changes in the kidneys included cloudy swelling, and the lungs displayed capillary engorgement, patchy edema, and occasional hemorrhage

Chemical Reactivity

Reactivity with Water No reaction; Reactivity with Common Materials: No reactions; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.

Safety Profile

Poison by intraperitoneal route. Moderately toxic by ingestion. An eye irritant. Dangerous fire hazard by exposure to heat, flame, sparks, or powerful oxidizers. Reacts violently with HNO3. Incompatible with acids, acid fumes, oxidizing materials, heat, flame, and sparks. To fight fire, use alcohol foam. When heated to decomposition it emits toxic SOx. See also MERCAPTANS.


Butanethiol is a very noxious and caustic chemical compound, and at sufficiently high concentrations, it produces serious health effects in both humans and animals, especially as a result of prolonged exposure. Higher concentrations can lead to unconsciousness and coma after prolonged exposure. Contact with the skin and mucous membranes causes burns, and contact with the eyes can lead to blurred vision or complete blindness.
Inhalation may cause weakness, confusion, cough, dizziness, drowsiness, headache, nausea, vomiting, and shortness of breath. The substance irritates the eyes, the skin, and the respiratory tract. It may cause effects on the thyroid and the nervous system and could cause lowering of consciousness.

Potential Exposure

Butyl mercaptan is a flammable, colorless liquid with a strong, skunk-like odor. The Odor Threshold in air is 0.00097 ppm. Molecular weight 5 90.19; Specific gravity (H2O:1) 5 0.83 @ 20C; boiling point 5 99C;freezing/melting point 5 2116C; vapor pressure 5 35 mmHg @ 20C; 75 mmHg @ 34.5C; relative vapor density (air 5 1) 5 3.1; Flash point 5 2C (cc); Autoignition temperature # 225C. Explosive limits: LEL: 1.4%; UEL: 10.2%. Hazard identification (based on NFPA-704 M Rating System): Health 1; flammability 3; reactivity 0 ?. Slightly soluble in water; solubility 5 0.06% @ 20C.

Environmental Fate

Chemical/Physical. Releases toxic sulfur oxide fumes when heated to decomposition (Sax and Lewis, 1987).


UN2347 Butyl mercaptan, Hazard Class: 3; Labels: 3—Flammable liquid

Purification Methods

Dry the thiol with CaSO4 or Na2SO4, then reflux it over magnesium, or dry with, and distil it from CaO, under nitrogen [Roberts & Friend J Am Chem Soc 108 7204 1986.] It has been separated from hydrocarbons by extractive distillation with aniline. Dissolve it also in 20% NaOH, extract with a small amount of *C6H6, then steam distil it until clear. The solution is then cooled and acidified slightly with 15% H2SO4. The thiol is distilled out, dried with CaSO4 or CaCl2, and fractionally distilled under N2 [Mathias & Filho J Phys Chem 62 1427 1958]. It has also been purified by precipitation as the lead mercaptide from alcoholic solution, then regeneration by adding dilute HCl to the residue followed by steam distillation. All operations should be carried out in a fume cupboard due to the TOXICITY and obnoxious odour of the thiol. [Beilstein 1 IV 1555.]


May form explosive mixture with air. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Attacks some plastics and rubber

Waste Disposal

Incineration (1093C) followed by scrubbing with a caustic solution.


Butanethiol decomposes an heading and release toxic fumes. It reacts with strong acids, bases and strong oxidants. Workers during handling of butanethiol should be very careful, should avoid open flames, sparkings, and smoking. Chemical vapor/air mixtures cause explosion ha3 and workers should wear protective cloathing, safety goggles and breathing apparatus and should work in good ventillation

Butanethiol Preparation Products And Raw materials

Raw materials

Preparation Products

Butanethiol Suppliers

Global( 153)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21676 58
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32447 55
career henan chemical co
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Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 23980 58
Hubei Jusheng Technology Co.,Ltd.
027-59599243 CHINA 28236 58
Jinan Finer Chemical Co., Ltd
+86-531-88989539 CHINA 947 58
Cangzhou Wanyou New Material Technology Co.,Ltd
18631714998 CHINA 913 58
Kono Chem Co., Ltd
+86-132 8924 6953(Whatsapp/Wechat)
+86-29-86107037 CHINA 2997 58
Hubei xin bonus chemical co. LTD
027-59338440 CHINA 23049 58
Shandong chuangyingchemical Co., Ltd.
13156170209 CHINA 4405 58

View Lastest Price from Butanethiol manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-04-11 Butanethiol
US $1.00 / g 10g 99% 300 Metric Ton/Metric Tons per Year Cangzhou Wanyou New Material Technology Co.,Ltd
2018-07-30 Butanethiol
US $100.00 / KG 25KG 98% 25 career henan chemical co

Butanethiol Spectrum

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