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Propyne

Also known as: Propyne · Methylacetylene · prop-1-yne · 1-PROPYNE

CAS No.: 74-99-7
Formula: C3H4
Molar mass: 40.06 g/mol
PubChem CID: 6335

GHS pictograms

Flammable

Compressed gas

Harmful / Irritant

2D structure of Propyne — 2D structure · PubChem CID 6335

Summary

Propyne (C3H4), CAS 74-99-7. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.

Background

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Hazards

Flammable (GHS02)

Ignites easily when exposed to a flame or spark.

Compressed gas (GHS04)

Contents under pressure, may explode if heated.

Harmful / Irritant (GHS07)

May cause skin, eye or respiratory irritation.

Hazard statements

H220: Extremely flammable gas [Danger Flammable gases]
H280: Contains gas under pressure
H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure
H336: May cause drowsiness or dizziness [Warning Specific target organ toxicity, single exposure

Storage

Temperature

Keep at room temperature, below 30 °C, out of direct heat.

Ventilation

Store somewhere well-ventilated and away from any ignition source.

Containers

Metal drums or tinted glass, tightly sealed.

Keep away from

Strong acids, strong bases and powerful oxidizers.

Personal protective equipment

Gloves

Nitrile or butyl, at least 0.4 mm thick.

Eye protection

Safety goggles with side shields.

Respirator

A2 organic-vapor cartridge if the room isn't well ventilated.

Occupational exposure limits (HSE)

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EU harmonised classification (ECHA C&L)

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Transport

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FDA recalls & enforcement

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Compatibilities

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Practical safety notes

Flammable. Keep away from open flames, hot surfaces and sparks. Ground containers when transferring.
Compressed gas. Secure cylinders upright, protect valves, store in ventilated areas.
Irritant / harmful. Ventilate the workspace and avoid skin contact.

Derived from the GHS classification shown above. These notes are generic guidance and do not replace the manufacturer's SDS or your local risk assessment.

FAQ

Is Propyne flammable?+

Yes. Propyne (CAS 74-99-7) carries the GHS02 flame pictogram. Keep it away from ignition sources, use non-sparking tools, and ground metal containers when transferring liquid.

What PPE should I wear when handling Propyne?+

Safety glasses with side shields and nitrile gloves are the baseline. Ventilation should be sufficient to keep vapours below the occupational exposure limit. Check SDS section 8 for material-specific breakthrough times.

How should Propyne be stored?+

Store Propyne (CAS 74-99-7) in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible materials. Use a flammable-liquid cabinet and keep away from oxidizers and heat.

Is Propyne dangerous for the environment?+

No specific environmental pictogram (GHS09) is listed in our records for Propyne, but any chemical waste should be handled through your site's hazardous-waste procedure, not poured down the drain.

Where can I find the official Safety Data Sheet for Propyne?+

Official, up-to-date SDS documents are published by each manufacturer (Sigma-Aldrich, Merck, Thermo Fisher, VWR, Carl Roth, etc.) and by regulators such as ECHA and NIOSH. This page is an educational summary and does not replace the manufacturer's SDS.

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