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74-86-2 Structure

74-86-2 Structure



Welding Gas
Acetylene (non-chemical use)
Acetylene (chemical use)
acetylene ethyne
Drew Ameroid Amerox Acetylene 40 LTR
Dissolved acetylene
Acetylene (liquefied)

[Molecular Formula]

[MDL Number]

[Molecular Weight]

[MOL File]

Chemical PropertiesBack Directory

Acetylene (100% purity) is odourless, but commercial purity has a distinctive garlic-like odour and is very soluble in alcohol and almost miscible with ethane. Acetylene is a flammable gas and kept under pressure in gas cylinders. Under certain conditions, acetylene can react with copper, silver, and mercury to form acetylides, compounds which can act as ignition sources. Brasses containing less than 65% copper in the alloy and certain nickel alloys are suitable for acetylene. Acetylene is not compatible with strong oxidisers such as chlorine, bromine pentafluoride, oxygen, oxygen difluoride and nitrogen trifluoride, brass metal, calcium hypochlorite, heavy metals such as copper, silver, mercury, and their salts, bromine, chlorine, iodine, fluorine, sodium hydride, caesium hydride, ozone, perchloric acid, and potassium.

Acetylene is an extremely flammable, colorless, compressed gas. It has a faint ethereal odor when pure; a garlic-like odor when contaminated
[mp ]

[bp ]

[density ]

[refractive index ]

[Fp ]

[Water Solubility ]

0.106 g/100 mL
[CAS DataBase Reference]

74-86-2(CAS DataBase Reference)
[NIST Chemistry Reference]

[EPA Substance Registry System]

74-86-2(EPA Substance)
Hazard InformationBack Directory
[Chemical Properties]

Acetylene (100% purity) is odorless but commercial purity has a distinctive garlic-like odor. It is very soluble in alcohol and almost miscible with ethane. Acetylene is a flammable gas and kept under pressure in gas cylinders. Under certain conditions, acetylene can react with copper, silver, and mercury to form acetylides, compounds that can act as ignition sources. Brasses contain a form acetylides, compounds that can act as ignition sources. Brasses containing less than 65% copper in the alloy and certain nickel alloys are suitable for acetylene. Acetylene is not compatible with strong oxidizers such as chlorine, bromine pentafl uoride, oxygen, oxygen difl uoride, and nitrogen trifl uoride, brass metal, calcium hypochlorite, heavy metals such as copper, silver, mercury, and their salts, bromine, chlorine, iodine, fl uorine, sodium hydride, cesium hydride, ozone, perchloric acid, or potassium.
[General Description]

A colorless gas with a faint garlic-like odor. Easily ignited and burns with a sooty flame. Gas is lighter than air. Flame may flash back to the source of a leak very easily. Under prolonged exposure to fire or heat the containers may rupture violently and rocket.
[Reactivity Profile]

ACETYLENE(74-86-2) reacts with alkali metals, forming Hydrogen gas. ACETYLENE(74-86-2) can react explosively with bromine [Von Schwartz 1918. p.142 ]. ACETYLENE(74-86-2) forms a sensitive acetylide when passed into an aqueous solution of mercuric nitrate, [Mellor 4:933. 1946-47]. An ACETYLENE(74-86-2) torch used to drill through a plow frame, which was filled with hydrogen gas, produced an explosion [NIOSH, June 1998]. ACETYLENE(74-86-2) reacts with silver, copper and lead to form sensitive, explosive salts. Since ACETYLENE(74-86-2) is endothermic and effectively a reducing agent, it's reaction with oxidants can be very violent (examples: calcium hypochlorite, nitric acid, nitrogen oxide, ozone, trifluoromethyl hypofluorite, etc.). Contact of very cold liquefied gas with water may result in vigorous or violent boiling of the product and extremely rapid vaporization, due to the large temperature differences involved. If the water is hot, there is the possibility that a liquid "superheat" explosion may occur. Pressures may build to dangerous levels if liquid gas contacts water in a closed container [Handling Chemicals Safely 1980]. ACETYLENE(74-86-2) and ammonia can form explosive silver salts in contact with Ag. (Renner, Hermann, Gunther Schlamp. "Silver, Silver Compounds, and Silver Alloys." Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. 2001.).
[Air & Water Reactions]

Highly flammable. Slightly soluble in water. Reacts with water to form toxic ammonia fumes.
[Health Hazard]

Headache, dizziness and loss of consciousness may occur. Death from ``smothering'' may occur if oxygen content of the air is severely reduced by dilution with acetylene.
[Health Hazard]

Prolonged periods of exposure to acetylene cause symptoms including headaches, respiratory diffi culty, ringing in ears, shortness of breath, wheezing, dizziness, drowsiness, unconsciousness, nausea, vomiting, and depression of all the senses. The skin of a victim of overexposure may have a blue color. Currently, there are no known adverse health effects associated with chronic exposure to the components of this compressed gas. Lack of suffi cient oxygen may cause serious injury or death. The target organs include the kidneys, CNS, liver, respiratory system, and eyes.
[Potential Exposure]

Acetylene can be burned in air or oxygen and is used for brazing, welding, cutting, metallizing, hardening, flame scarfing; and local heating in metallurgy. The flame is also used in the glass industry. Chemically, acetylene is used in the manufacture of vinyl chloride, acrylinitrile, synthetic rubber; vinyl acetate; trichloroethylene, acrylate, butyrolactone, 1,4-butanediol, vinyl alkyl ethers, pyrrolidone, and other substances
[Fire Hazard]

Behavior in Fire: May explode in fire
[First aid]

Move victim to fresh air. Call emergency medical care. Apply artificial respiration if victim is not breathing. If breathing is difficult, give oxygen. Remove and isolate contaminated clothing and shoes. In the case of contact with liquefied gas, thaw frosted parts with lukewarm water. Keep victim warm and quiet. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. See also NIOSH criteria document cited below. If frostbite has occurred, seek medical attention immediately; do NOT rub the affected areas or flush them with water. In order to prevent further tissue damage, do NOT attempt to remove frozen clothing from frostbitten areas. If frostbite has NOT occurred, immediately and thoroughly wash contaminated skin with soap and water.

UN1001 Acetylene, dissolved, Hazard Class: 2.1; Labels: 2.1-Flammable gas. Cylinders must be transported in a secure upright position, in a well-ventilated truck. Protect cylinder and labels from physical damage. The owner of the compressed gas cylinder is the only entity allowed by federal law (49CFR) to transport and refill them. It is a violation of transportation regulations to refill compressed gas cylinders without the express written permission of the owner

The substance may polymerize due to heating. The substance decomposes on heating and increasing pressure, causing a fire and explosion hazard. The substance is a strong reducing agent and reacts violently with oxidants and with fluorine or chlorine under influence of light, causing fire and explosion hazard. Reacts with copper, silver, and mercury or their salts, forming shock-sensitive compounds (acetylides). The content of lines carrying acetylene must not exceed 63% copper. May form explosive mixture with air. Forms shock-sensitive mixture with copper and copper salts; mercury and mercury salts; and silver and silver salts. Reacts with brass, bromine, cesium hydride, chlorine, cobalt, cuprous acetylize; fluorine, iodine, mercuric nitrate; nitric acid, potassium, rubidium hydride; trifluoromethyl hypofluorite; and sodium hydride.
[Waste Disposal]

Return refillable compressed gas cylinders to supplier. Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal. Incineration.
Safety DataBack Directory
[Hazard Codes ]

[Risk Statements ]

R5:Heating may cause an explosion.
R6:Explosive with or without contact with air.
R12:Extremely Flammable.
[Safety Statements ]

S9:Keep container in a well-ventilated place .
S16:Keep away from sources of ignition-No smoking .
S33:Take precautionary measures against static discharges .

UN 1001
[HazardClass ]


Acetylene should be kept stored in a cool, dry place in a tightly sealed container, and should only be used in a well-ventilated area. Cylinders should be separated from oxygen and other oxidizers by a minimum of 20 ft or by a barrier of non-combustible material at least 5 ft high, having a fi re resistance rating of at least 30 min. Storage in excess of 2500 cu ft is prohibited in buildings with other occupancies. Cylinders should be stored upright with a valve protection cap in place and fi rmly secured to prevent falling or being knocked over. The cylinders should be protected from physical damage and avoid dragging, rolling, sliding, or dropping the cylinder. During transport, workers should use a suitable hand truck for cylinder movement. Care should be taken to label “No Smoking” or “Open Flames” signs in the storage or use areas. There should be no sources of ignition. All electrical equipment should be explosion-proof in the storage and use areas.
[Safety Profile]

Mtldly toxic by inhalation. Human systemic effects by inhalation: headache and dyspnea. Narcotic in high concentration. In general industrial practice, acetylene does not constitute a serious toxic hazard. It is a very dangerous fire hazard when exposed to heat, flame, or oxidizers. Moderate explosion hazard when exposed to heat or flame or by spontaneous chemical reaction. At high pressures and moderate temperatures, and in the absence of air, acetylene has been known to decompose explosively. Reacts with copper to form the explosive copper acetylide. Incompatible with brass, copper salts, copper carbide, powdered Co, Hg, Hg salts, K, Ag and Ag salts, RbH, CsH, halogens, HNO3, NaH, oxidants. Acetylene + halide + UV can explode. Molten Kignites in C2H2 and then explodes. C2H2 reacts vigorously with trifluoromethyl hypo fluorite. With O2, C2H2 can detonate very powerfully. See ACETYLIDES. When ignited, it burns with an intensely hot flame; can react vigorously with oxidizing materials. When mixed with O2 in proportions of 40% or more, acetylene acts as a narcotic and has been used in anesthesia. Acetylene O2 in the air to a level that wd not support life. However, the presence of impurities in commercial acetylene may result in the production of symptoms before an asphyxiant concentration is reached. Thus: 10% in air produces a slight intoxication, 20% produces a staggering gait, 30% produces general incoordination, 33% leads to unconsciousness in 7 minutes, up to 80% produces complete anesthesia, increased blood pressure, narcosis, and stimulated respiration. symptoms, and (in hgh concentration) semi-asphyxia and brief loss of consciousness have all been reported. See ARGON for a dmussion of simple asphyxiants. To fight fire, use CO2, water spray, or dry chemical. Stop flow of gas
[Hazardous Substances Data]

74-86-2(Hazardous Substances Data)
Raw materials And Preparation ProductsBack Directory
[Raw materials]

Sulfuric acid -->Acetone-->Nitrogen-->Calcium chloride-->Sodium hypochlorite-->Calcium carbide-->Calcium chloride hexahydrate
[Preparation Products]

Acetic acid glacial-->Ethyl vinyl ether-->Poly(vinyl alcohol)-->Vinyl acetate-->Polyvinyl chloride-->1,4-Butanediol-->2-Butyne-1,4-diol-->2-Methyl-2-butanol-->1-ethynyl-4-tert-butyl-cyclohexan-1-ol-->1-Ethynyl-1-cyclohexanol-->Trimethylsilylacetylene-->Difluoroethane-->1-ethynyl-2-methyl penten-2-ol-->VINYL CHLORIDE-->Empenthrin-->Bis(trimethylsilyl)acetylene-->3-Methyl butynol -->synthesis of polyacetylene by using thorium high complex-->3,5-DIMETHYL-1-HEXYN-3-OL-->ETHYNYLMAGNESIUM BROMIDE
Material Safety Data Sheet(MSDS)Back Directory
[msds information]

Spectrum DetailBack Directory
[Spectrum Detail]

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