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Propyne safety data

GHS hazards, precautions, first aid, handling and transport for Propyne. A classification summary, not a safety data sheet.
CAS 74-99-7Formula C3H4

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

GHS classification

Pictograms, signal word and hazard classes of the GHS classification

GHS02: Flammable
Flammable
GHS04: Gas under pressure
Gas under pressure
GHS07: Harmful or irritant
Harmful or irritant
Signal word
Danger
413
NFPA 704 rating
health, fire, reactivity

Hazard classes and categories

  • Flam. Gas 1
  • Press. Gas
  • STOT SE 3 (respiratory irritation)
  • STOT SE 3 (narcotic effects)

Hazard statements

H codes grouped by type. Percentages show the share of classification notifications that report the statement

Physical hazards

  • H220Extremely flammable gas.
  • H280Contains gas under pressure, may explode if heated.

Health hazards

  • H335May cause respiratory irritation.
  • H336May cause drowsiness or dizziness.

Precautionary statements

P codes for prevention, response, storage and disposal

Prevention

  • P203Obtain, read and follow all safety instructions before use.
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P222Do not allow contact with air.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.

Response

  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P319Get medical help if you feel unwell.
  • P377Leaking gas fire: do not extinguish, unless leak can be stopped safely.
  • P381In case of leakage, eliminate all ignition sources.

Storage

  • P403Store in a well-ventilated place.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P410 + P403Protect from sunlight. Store in a well-ventilated place.

Disposal

  • P501Dispose of contents and container in accordance with local regulations.

First aid

General first aid measures. Get medical advice if you feel unwell

If inhaled
Respiratory support.
Skin contact
Compressed gases may create low temperatures when they expand rapidly. Leaks and uses that allow rapid expansion may cause a frostbite hazard. Wear appropriate personal protective clothing to prevent the skin from becoming frozen.
Eye contact
If eye tissue is frozen, seek medical attention immediately, if tissue is not frozen, immediately and thoroughly flush the eyes with large amounts of water for at least 15 minutes, occasionally lifting the lower and upper eyelids. If irritation, pain, swelling, lacrimation, or photophobia persist, get medical attention as soon as possible.

Handling, storage and disposal

Summaries only, follow the supplier SDS for your grade

Safe handling

Fire: NO open flames, NO sparks and NO smoking. Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding) if in liquid state. Use non-sparking handtools. Prevent build-up of electrostatic charges (e.g., by grounding).

Inhalation: Use local exhaust or breathing protection.

Skin: Cold-insulating gloves.

Eyes: Wear face shield.

Storage

Fireproof. Cool.

Disposal

METHYL ACETYLENE MAY BE DISPOSED OF 1. IF IN SMALL QUANTITIES, BY ALLOWING THE GAS TO ESCAPE INTO OPEN AIR AT A PLACE WHERE THERE ARE NO IGNITION SOURCES. 2. IF IN LARGE QUANTITIES, BY ALLOWING THE GAS TO BURN UNDER THE SUPERVISION OF QUALIFIED PERSONNEL.

Exposure limits and toxicity

Occupational exposure limits and toxicity data

OSHA PEL, 8-hour TWA
1000 ppm (1650 mg/m³)
NIOSH REL, TWA
1000 ppm (1650 mg/m³)
ACGIH TLV, 8-hour TWA
1000 ppm (EX)
IDLH
1700 ppm (10% LEL)

Short-term exposure: The substance is irritating to the respiratory tract. Rapid evaporation of the liquid may cause frostbite. Exposure could cause lowering of consciousness.

Transport information

UN dangerous goods classification for road, sea and air

UN number
UN 3161
Transport hazard class
2.1

Shipping rules depend on mode, quantity and packaging. Confirm the classification with the supplier SDS and your freight forwarder.

Supplier safety data sheets

SDS documents uploaded by suppliers who list this chemical

No supplier has uploaded an SDS for Propyne yet. Suppliers usually send one with their quote. Request quotes

Safety questions

Quick answers about handling Propyne safely

Is Propyne hazardous?

Propyne carries the GHS signal word "Danger". Main hazards: extremely flammable gas, contains gas under pressure, may explode if heated, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

Which GHS pictograms apply to Propyne?

The GHS classification of Propyne shows 3 pictograms: GHS02 (flammable), GHS04 (gas under pressure), GHS07 (harmful or irritant).

What is the UN number of Propyne?

Propyne is transported under UN 3161, hazard class 2.1. Check the supplier SDS and the current ADR, IMDG or IATA rules before shipping.

How should Propyne be stored?

Fireproof. Cool.

Where can I get the SDS for Propyne?

Ask the supplier for the safety data sheet of the exact grade you buy. Suppliers on CompoundList can attach their SDS to listings and send it with a quote. This page is a GHS classification summary, not an SDS.

GHS classification summary, not an SDS. Always check the supplier's SDS. Last updated 7 Oct 2026. Report an error

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