SAFETY DATA SHEET
Acetylene

Section 1. Identification
GHS product identifier: Acetylene

Chemical name: acetylene

Other means ofidentification: Ethyne; Ethine; Narcylen; C2H2; Acetylen; UN 1001; Vinylene

Product type

: Gas.

Product use: Synthetic/Analytical chemistry.

Synonym: Ethyne; Ethine; Narcylen; C2H2; Acetylen; UN 1001; Vinylene

SDS #Supplier's details: 001001: Airgas USA, LLC and its affiliates
259 North Radnor-Chester Road
Suite 100
Radnor, PA 19087-5283
1-610-687-5253

24-hour telephone: 1-866-734-3438

Section 2. Hazards identification
OSHA/HCS status
Classification of thesubstance or mixture: This material is considered hazardous by the OSHA Hazard Communication Standard(29 CFR 1910.1200).
: FLAMMABLE GASES - Category 1
GASES UNDER PRESSURE - Compressed gas

GHS label elements
Hazard pictograms:

Signal word

: Danger

Hazard statements: Extremely flammable gas.
Contains gas under pressure; may explode if heated.
May displace oxygen and cause rapid suffocation.
May form explosive mixtures with air.

Precautionary statements
GeneralStorage: Read and follow all Safety Data Sheets (SDS’S) before use. Read label before use.
Keep out of reach of children. If medical advice is needed, have product container orlabel at hand. Close valve after each use and when empty. Use equipment rated forcylinder pressure. Do not open valve until connected to equipment prepared for use.
Fusible plugs in top, bottom, or valve melt at 98°C to 107°C (208°F to 224°F). Do notdischarge at pressures above 15psig (103kpa). Use a back flow preventative device inthe piping. Use only equipment of compatible materials of construction. Approachsuspected leak area with caution.
: Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No
smoking.
: Leaking gas fire: Do not extinguish, unless leak can be stopped safely. In case ofleakage, eliminate all ignition sources.
: Protect from sunlight. Store in a well-ventilated place.

Disposal: Not applicable.

Prevention
Response

Hazards not otherwiseclassified: In addition to any other important health or physical hazards, this product may displace
oxygen and cause rapid suffocation.

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Section 3. Composition/information on ingredients
Substance/mixture: SubstanceChemical name: acetylene

Other means ofidentification: Ethyne; Ethine; Narcylen; C2H2; Acetylen; UN 1001; Vinylene

Product code

: 001001

CAS number/other identifiers
CAS number: 74-86-2

Ingredient name%

CAS number

Acetylene

100

74-86-2

Any concentration shown as a range is to protect confidentiality or is due to batch variation.
There are no additional ingredients present which, within the current knowledge of the supplier and in theconcentrations applicable, are classified as hazardous to health or the environment and hence require reportingin this section.
Occupational exposure limits, if available, are listed in Section 8.

Section 4. First aid measures
Description of necessary first aid measures
Eye contact

Inhalation

Skin contact

Ingestion: Immediately flush eyes with plenty of water, occasionally lifting the upper and lower
eyelids. Check for and remove any contact lenses. Continue to rinse for at least 10
minutes. Get medical attention if irritation occurs.
: Remove victim to fresh air and keep at rest in a position comfortable for breathing. If
not breathing, if breathing is irregular or if respiratory arrest occurs, provide artificial
respiration or oxygen by trained personnel. It may be dangerous to the person providing
aid to give mouth-to-mouth resuscitation. Get medical attention if adverse health effects
persist or are severe. If unconscious, place in recovery position and get medical
attention immediately. Maintain an open airway. Loosen tight clothing such as a collar,tie, belt or waistband.
: Flush contaminated skin with plenty of water. Remove contaminated clothing andshoes. To avoid the risk of static discharges and gas ignition, soak contaminatedclothing thoroughly with water before removing it. Get medical attention if symptoms
occur. Wash clothing before reuse. Clean shoes thoroughly before reuse.
: As this product is a gas, refer to the inhalation section.

Most important symptoms/effects, acute and delayed
Potential acute health effects
Eye contact: Contact with rapidly expanding gas may cause burns or frostbite.

Inhalation: No known significant effects or critical hazards.

Skin contact: Contact with rapidly expanding gas may cause burns or frostbite.

Frostbite
Ingestion: Try to warm up the frozen tissues and seek medical attention.
: As this product is a gas, refer to the inhalation section.

Over-exposure signs/symptoms
Eye contact: No specific data.

Inhalation: No specific data.

Skin contact: No specific data.

Ingestion: No specific data.

Indication of immediate medical attention and special treatment needed, if necessary
Notes to physician
Specific treatments
Date of issue/Date of revision: Treat symptomatically. Contact poison treatment specialist immediately if large
quantities have been ingested or inhaled.
: No specific treatment.
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Section 4. First aid measures
Protection of first-aiders: No action shall be taken involving any personal risk or without suitable training. It may
be dangerous to the person providing aid to give mouth-to-mouth resuscitation.

See toxicological information (Section 11)

Section 5. Fire-fighting measures
Extinguishing media
Suitable extinguishingmedia
Unsuitable extinguishingmedia
Specific hazards arisingfrom the chemical
Hazardous thermal
decomposition products

Special protective actions
for fire-fighters

Special protective
equipment for fire-fighters: Use an extinguishing agent suitable for the surrounding fire.
: None known.

: Contains gas under pressure. Extremely flammable gas. In a fire or if heated, apressure increase will occur and the container may burst, with the risk of a subsequent
explosion.
: Decomposition products may include the following materials:
carbon dioxidecarbon monoxide: Promptly isolate the scene by removing all persons from the vicinity of the incident if
there is a fire. No action shall be taken involving any personal risk or without suitabletraining. Contact supplier immediately for specialist advice. Move containers from firearea if this can be done without risk. Use water spray to keep fire-exposed containers
cool. If involved in fire, shut off flow immediately if it can be done without risk. If this is
impossible, withdraw from area and allow fire to burn. Fight fire from protected locationor maximum possible distance. Eliminate all ignition sources if safe to do so.
: Fire-fighters should wear appropriate protective equipment and self-contained breathingapparatus (SCBA) with a full face-piece operated in positive pressure mode.

Section 6. Accidental release measures
Personal precautions, protective equipment and emergency procedures
For non-emergency
personnel: Accidental releases pose a serious fire or explosion hazard. No action shall be taken
involving any personal risk or without suitable training. Evacuate surrounding areas.
Keep unnecessary and unprotected personnel from entering. Shut off all ignition
sources. No flares, smoking or flames in hazard area. Avoid breathing gas. Provide
adequate ventilation. Wear appropriate respirator when ventilation is inadequate. Put
on appropriate personal protective equipment.
For emergency responders : If specialized clothing is required to deal with the spillage, take note of any information in
Section 8 on suitable and unsuitable materials. See also the information in "For nonemergency personnel".
Environmental precautions: Ensure emergency procedures to deal with accidental gas releases are in place to avoid
contamination of the environment. Inform the relevant authorities if the product hascaused environmental pollution (sewers, waterways, soil or air).

Methods and materials for containment and cleaning up
Small spill
Large spill

Date of issue/Date of revision: Immediately contact emergency personnel. Stop leak if without risk. Use spark-proof
tools and explosion-proof equipment.
: Immediately contact emergency personnel. Stop leak if without risk. Use spark-proof
tools and explosion-proof equipment. Note: see Section 1 for emergency contact
information and Section 13 for waste disposal.

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Section 7. Handling and storage
Precautions for safe handlingProtective measures: Put on appropriate personal protective equipment (see Section 8). Contains gas underpressure. Avoid breathing gas. Use only with adequate ventilation. Wear appropriate
respirator when ventilation is inadequate. Do not enter storage areas and confined
spaces unless adequately ventilated. Do not puncture or incinerate container. Use
equipment rated for cylinder pressure. Close valve after each use and when empty.
Protect cylinders from physical damage; do not drag, roll, slide, or drop. Use a suitable
hand truck for cylinder movement.
Use only non-sparking tools. Avoid contact with eyes, skin and clothing. Empty
containers retain product residue and can be hazardous. Store and use away from heat,sparks, open flame or any other ignition source. Use explosion-proof electrical(ventilating, lighting and material handling) equipment.

Advice on general
occupational hygiene: Eating, drinking and smoking should be prohibited in areas where this material ishandled, stored and processed. Workers should wash hands and face before eating,drinking and smoking. Remove contaminated clothing and protective equipment before
entering eating areas. See also Section 8 for additional information on hygiene
measures.

Conditions for safe storage,
including any
incompatibilities: Store in accordance with local regulations. Store in a segregated and approved area.
Store away from direct sunlight in a dry, cool and well-ventilated area, away fromincompatible materials (see Section 10). Eliminate all ignition sources. Cylinders
should be stored upright, with valve protection cap in place, and firmly secured toprevent falling or being knocked over. Cylinder temperatures should not exceed 52 °C(125 °F). Keep container tightly closed and sealed until ready for use. See Section 10
for incompatible materials before handling or use.

Section 8. Exposure controls/personal protection
Control parameters
Occupational exposure limits
Ingredient name

Exposure limits

Acetylene

NIOSH REL (United States, 10/2016).
CEIL: 2662 mg/m³
CEIL: 2500 ppm
ACGIH TLV (United States, 3/2019). Oxygen
Depletion [Asphyxiant]. Explosive potential.
California PEL for Chemical Contaminants (Table AC-1) (United States). Oxygen
Depletion [Asphyxiant].

Appropriate engineering
controls

Environmental exposure
controls: Use only with adequate ventilation. Use process enclosures, local exhaust ventilation orother engineering controls to keep worker exposure to airborne contaminants below any
recommended or statutory limits. The engineering controls also need to keep gas,
vapor or dust concentrations below any lower explosive limits. Use explosion-proof
ventilation equipment.
: Emissions from ventilation or work process equipment should be checked to ensure
they comply with the requirements of environmental protection legislation. In somecases, fume scrubbers, filters or engineering modifications to the process equipment
will be necessary to reduce emissions to acceptable levels.

Individual protection measures
Hygiene measures

Date of issue/Date of revision: Wash hands, forearms and face thoroughly after handling chemical products, before
eating, smoking and using the lavatory and at the end of the working period.
Appropriate techniques should be used to remove potentially contaminated clothing.
Wash contaminated clothing before reusing. Ensure that eyewash stations and safety
showers are close to the workstation location.

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Section 8. Exposure controls/personal protection
Eye/face protection: Safety eyewear complying with an approved standard should be used when a risk
assessment indicates this is necessary to avoid exposure to liquid splashes, mists,gases or dusts. If contact is possible, the following protection should be worn, unlessthe assessment indicates a higher degree of protection: safety glasses with sideshields.

Skin protection
Hand protection

Body protection

Other skin protection

Respiratory protection: Chemical-resistant, impervious gloves complying with an approved standard should beworn at all times when handling chemical products if a risk assessment indicates this isnecessary. Considering the parameters specified by the glove manufacturer, check
during use that the gloves are still retaining their protective properties. It should be
noted that the time to breakthrough for any glove material may be different for different
glove manufacturers. In the case of mixtures, consisting of several substances, theprotection time of the gloves cannot be accurately estimated.
: Personal protective equipment for the body should be selected based on the task being
performed and the risks involved and should be approved by a specialist before
handling this product. When there is a risk of ignition from static electricity, wear antistatic protective clothing. For the greatest protection from static discharges, clothingshould include anti-static overalls, boots and gloves.
: Appropriate footwear and any additional skin protection measures should be selectedbased on the task being performed and the risks involved and should be approved by aspecialist before handling this product.
: Based on the hazard and potential for exposure, select a respirator that meets theappropriate standard or certification. Respirators must be used according to a
respiratory protection program to ensure proper fitting, training, and other important
aspects of use. Respirator selection must be based on known or anticipated exposurelevels, the hazards of the product and the safe working limits of the selected respirator.

Section 9. Physical and chemical properties
Appearance
Physical state: Gas.

Color: Colorless.

Odor
Odor thresholdpH: Mild. Ethereal.
: Not available.
: Not available.

Melting point: -81°C (-113.8°F)

Boiling point
Critical temperature: Not available.
: 35.25°C (95.5°F)

Flash point: Closed cup: -18.15°C (-0.67°F)

Evaporation rate

: Not available.

Flammability (solid, gas)

Lower and upper explosive(flammable) limits
Vapor pressure
Vapor density: Extremely flammable in the presence of the following materials or conditions: open
flames, sparks and static discharge and oxidizing materials.
Highly flammable in the presence of the following materials or conditions: heat.
: Lower: 2.5%
Upper: 100%
: 635 (psig): 0.907 (Air = 1)

Specific Volume (ft 3/lb): 14.7058

3

Gas Density (lb/ft ): 0.0691

Relative density: Not applicable.

Solubility
Solubility in water
Partition coefficient: noctanol/water: Not available.
: 1.2 g/l
: 0.37

Auto-ignition temperature: 305°C (581°F)

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Section 9. Physical and chemical properties
Decomposition temperature: Not available.

Viscosity: Not applicable.

Flow time (ISO 2431): Not available.

Molecular weight: 26.04 g/moleAerosol productHeat of combustion: -48257522 J/kg

Section 10. Stability and reactivity
Reactivity: No specific test data related to reactivity available for this product or its ingredients.

Chemical stability: The product is stable.

Possibility of hazardous
reactions: Under normal conditions of storage and use, hazardous reactions will not occur.

Conditions to avoid: Avoid all possible sources of ignition (spark or flame). Do not pressurize, cut, weld,
braze, solder, drill, grind or expose containers to heat or sources of ignition.

Incompatible materials: Oxidizers

Hazardous decomposition
products: Under normal conditions of storage and use, hazardous decomposition products should
not be produced.

Hazardous polymerization: Under normal conditions of storage and use, hazardous polymerization will not occur.

Section 11. Toxicological information
Information on toxicological effects
Acute toxicity
Not available.
Irritation/Corrosion
Not available.
Sensitization
Not available.
Mutagenicity
Not available.
Carcinogenicity
Not available.
Reproductive toxicity
Not available.
Teratogenicity
Not available.
Specific target organ toxicity (single exposure)
Not available.
Specific target organ toxicity (repeated exposure)
Not available.
Aspiration hazard
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Section 11. Toxicological information
Not available.
Information on the likely
routes of exposure: Not available.

Potential acute health effects
Eye contact: Contact with rapidly expanding gas may cause burns or frostbite.
Inhalation: No known significant effects or critical hazards.
Skin contact: Contact with rapidly expanding gas may cause burns or frostbite.
Ingestion: As this product is a gas, refer to the inhalation section.

Symptoms related to the physical, chemical and toxicological characteristics
Eye contact: No specific data.
Inhalation: No specific data.

Skin contact: No specific data.

Ingestion: No specific data.

Delayed and immediate effects and also chronic effects from short and long term exposure
Short term exposure
Potential immediate: Not available.
effects
Potential delayed effects: Not available.

Long term exposure
Potential immediate
effects: Not available.

Potential delayed effects: Not available.

Potential chronic health effects
Not available.
GeneralCarcinogenicity: No known significant effects or critical hazards.
: No known significant effects or critical hazards.

Mutagenicity: No known significant effects or critical hazards.

Teratogenicity: No known significant effects or critical hazards.

Developmental effects: No known significant effects or critical hazards.

Fertility effects: No known significant effects or critical hazards.

Numerical measures of toxicity
Acute toxicity estimates
Not available.

Section 12. Ecological information
Toxicity
Not available.
Persistence and degradability
Not available.
Bioaccumulative potential
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Section 12. Ecological information
Product/ingredient name

LogPow

BCF

Potential

Acetylene

0.37

-

low

Mobility in soil
Soil/water partition
coefficient (KOC): Not available.

Other adverse effects: No known significant effects or critical hazards.

Section 13. Disposal considerations
Disposal methods: The generation of waste should be avoided or minimized wherever possible. Disposalof this product, solutions and any by-products should at all times comply with therequirements of environmental protection and waste disposal legislation and any
regional local authority requirements. Dispose of surplus and non-recyclable products
via a licensed waste disposal contractor. Waste should not be disposed of untreated tothe sewer unless fully compliant with the requirements of all authorities with jurisdiction.
Empty Airgas-owned pressure vessels should be returned to Airgas. Waste packaging
should be recycled. Incineration or landfill should only be considered when recycling is
not feasible. This material and its container must be disposed of in a safe way. Empty
containers or liners may retain some product residues. Do not puncture or incineratecontainer.

Section 14. Transport information
DOT

TDG

MexicoIMDG

IATA

UN number

UN1001

UN1001

UN1001

UN1001

UN1001

UN proper
shipping name

ACETYLENE,DISSOLVED

ACETYLENE,DISSOLVED

ACETYLENE,DISSOLVED

ACETYLENE,DISSOLVED

ACETYLENE,DISSOLVED

Transport
2.1
hazard class(es)

2.1

2.1

2.1

2.1

Packing group

-

-

-

-

-

Environmental
hazards

No.

No.

No.

No.

No.

“Refer to CFR 49 (or authority having jurisdiction) to determine the information required for shipment of the
product.”
Additional information
DOT Classification
TDG Classification: Limited quantity Yes.
Quantity limitation Passenger aircraft/rail: Forbidden. Cargo aircraft: 15 kg.
: Product classified as per the following sections of the Transportation of Dangerous
Goods Regulations: 2.13-2.17 (Class 2).
Explosive Limit and Limited Quantity Index
0
Passenger Carrying Vessel Index
75
Passenger Carrying Road or Rail Index
Forbidden

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Section 14. Transport information
IATA

Special provisions
38: Quantity limitation Passenger and Cargo Aircraft: Forbidden. Cargo Aircraft Only: 15kg.

Special precautions for user : Transport within user’s premises: always transport in closed containers that are
upright and secure. Ensure that persons transporting the product know what to do in theevent of an accident or spillage.
Transport in bulk according
to IMO instruments: Not available.

Section 15. Regulatory information
U.S. Federal regulations: TSCA 8(a) CDR Exempt/Partial exemption: Not determined

Clean Air Act Section 112(b) Hazardous Air
Pollutants (HAPs): Not listed

Clean Air Act Section 602
Class I Substances: Not listed

Clean Air Act Section 602
Class II Substances: Not listed

DEA List I Chemicals(Precursor Chemicals): Not listed

DEA List II Chemicals(Essential Chemicals): Not listed

Clean Air Act (CAA) 112 regulated flammable substances: acetylene

SARA 302/304
Composition/information on ingredients
No products were found.
SARA 304 RQ: Not applicable.

SARA 311/312
Classification: Refer to Section 2: Hazards Identification of this SDS for classification of substance.

State regulations
Massachusetts: This material is listed.

New York: This material is not listed.

New Jersey: This material is listed.

Pennsylvania: This material is listed.

California Prop. 65
This product does not require a Safe Harbor warning under California Prop. 65.
International regulations
Chemical Weapon Convention List Schedules I, II & III Chemicals
Not listed.
Montreal Protocol
Not listed.
Stockholm Convention on Persistent Organic Pollutants
Not listed.
Rotterdam Convention on Prior Informed Consent (PIC)
Not listed.
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Section 15. Regulatory information
UNECE Aarhus Protocol on POPs and Heavy Metals
Not listed.
Inventory list
Australia: This material is listed or exempted.

Canada: This material is listed or exempted.

China: This material is listed or exempted.

Europe: This material is listed or exempted.

Japan
New Zealand: Japan inventory (ENCS): This material is listed or exempted.
Japan inventory (ISHL): Not determined.
: This material is listed or exempted.

Philippines: This material is listed or exempted.

Republic of Korea: This material is listed or exempted.

Taiwan: This material is listed or exempted.

Thailand: Not determined.

Turkey: This material is listed or exempted.

United States: This material is active or exempted.

Viet Nam: This material is listed or exempted.

Section 16. Other information
Hazardous Material Information System (U.S.A.)/

Health0

Flammability

4Physical hazards

3

Caution: HMIS® ratings are based on a 0-4 rating scale, with 0 representing minimal hazards or risks, and 4
representing significant hazards or risks. Although HMIS® ratings and the associated label are not required on
SDSs or products leaving a facility under 29 CFR 1910.1200, the preparer may choose to provide them. HMIS®
ratings are to be used with a fully implemented HMIS® program. HMIS® is a registered trademark and service
mark of the American Coatings Association, Inc.
The customer is responsible for determining the PPE code for this material. For more information on HMIS®
Personal Protective Equipment (PPE) codes, consult the HMIS® Implementation Manual.
National Fire Protection Association (U.S.A.)
Flammability

4
Health00Instability/Reactivity
SpecialNote: The instability hazard rating for acetylene, dissolved (stabilized acetylene) is 2.

Reprinted with permission from NFPA 704-2001, Identification of the Hazards of Materials for Emergency
Response Copyright ©1997, National Fire Protection Association, Quincy, MA 02269. This reprinted material is
not the complete and official position of the National Fire Protection Association, on the referenced subject
which is represented only by the standard in its entirety.
Copyright ©2001, National Fire Protection Association, Quincy, MA 02269. This warning system is intended to
be interpreted and applied only by properly trained individuals to identify fire, health and reactivity hazards ofchemicals. The user is referred to certain limited number of chemicals with recommended classifications in
NFPA 49 and NFPA 325, which would be used as a guideline only. Whether the chemicals are classified by NFPA
or not, anyone using the 704 systems to classify chemicals does so at their own risk.
Procedure used to derive the classification
Classification

Justification

FLAMMABLE GASES - Category 1
GASES UNDER PRESSURE - Compressed gas
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Section 16. Other information
History
Date of printing: 6/21/2021

Date of issue/Date ofrevision
Date of previous issue: 6/21/2021

Version: 2.02

Key to abbreviations: ATE = Acute Toxicity Estimate
BCF = Bioconcentration Factor
GHS = Globally Harmonized System of Classification and Labelling of Chemicals
IATA = International Air Transport Association
IBC = Intermediate Bulk Container
IMDG = International Maritime Dangerous Goods
LogPow = logarithm of the octanol/water partition coefficient
MARPOL = International Convention for the Prevention of Pollution From Ships, 1973
as modified by the Protocol of 1978. ("Marpol" = marine pollution)
UN = United Nations: Not available.

References: 11/11/2020

Notice to reader
To the best of our knowledge, the information contained herein is accurate. However, neither the above-named
supplier, nor any of its subsidiaries, assumes any liability whatsoever for the accuracy or completeness of theinformation contained herein.
Final determination of suitability of any material is the sole responsibility of the user. All materials may present
unknown hazards and should be used with caution. Although certain hazards are described herein, we cannot
guarantee that these are the only hazards that exist.

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