Educational content for trained professionals. Not a Safety Data Sheet, not medical advice. In an emergency, call your local poison control or emergency services immediately. Terms of use.
Propiolic Acid
Also known as: PROPIOLIC ACID · 471-25-0 · 2-Propynoic acid · prop-2-ynoic acid
- CAS No.
- 471-25-0
- Formula
- C3H2O2
- Molar mass
- 70.05 g/mol
- PubChem CID
- 10110
Flammable
Corrosive
Toxic
Harmful / Irritant
Summary
Propiolic Acid (C3H2O2), CAS 471-25-0. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.
Background
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Physical properties
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Hazards
Ignites easily when exposed to a flame or spark.
Attacks skin, eyes and materials.
May be fatal even in small doses.
May cause skin, eye or respiratory irritation.
Hazard statements
- H226: Flammable liquid and vapor [Warning Flammable liquids]
- H301: Toxic if swallowed [Danger Acute toxicity, oral]
- H310: Fatal in contact with skin [Danger Acute toxicity, dermal]
- H314
- H315: Causes skin irritation [Warning Skin corrosion/irritation]
- H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure
Storage
Keep at room temperature, below 30 °C, out of direct heat.
Store somewhere well-ventilated and away from any ignition source.
Metal drums or tinted glass, tightly sealed.
Strong acids, strong bases and powerful oxidizers.
Personal protective equipment
Nitrile or butyl, at least 0.4 mm thick.
Safety goggles with side shields.
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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Open comparator with Propiolic AcidPractical safety notes
- Flammable. Keep away from open flames, hot surfaces and sparks. Ground containers when transferring.
- Corrosive. Wear chemical goggles, faceshield and chemical-resistant gloves. Have an eyewash within reach.
- Acute toxicity. Work under a fume hood, restrict access, keep a specific antidote plan available.
- 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 Propiolic Acid flammable?+
Yes. Propiolic Acid (CAS 471-25-0) 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 Propiolic Acid?+
Chemical-splash goggles and a faceshield, chemical-resistant gloves (nitrile or butyl) and an apron are the minimum. Work inside a fume hood or use a suitable respirator. Check SDS section 8 for material-specific breakthrough times.
How should Propiolic Acid be stored?+
Store Propiolic Acid (CAS 471-25-0) 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. Segregate acids from bases and keep away from metals that can be attacked.
Is Propiolic Acid dangerous for the environment?+
No specific environmental pictogram (GHS09) is listed in our records for Propiolic Acid, 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 Propiolic Acid?+
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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