Substance profile
Prop-2-yn-1-ol
Prop-2-yn-1-ol is a colorless liquid with a mild, geranium odor.
01 · Identification
What Prop-2-yn-1-ol is
Prop-2-yn-1-ol is a colorless liquid with a mild, geranium odor. Its molecular formula is C3H4O and its molecular weight is 56.06 g/mol. It boils at 114 °C, melts at -52.2 °C.
Under the GHS it carries the signal word Danger. It is classed as flammable agents - 3rd degree.
Other names for Prop-2-yn-1-ol
- propargyl alcohol
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H226 | Flammable liquid and vapour. |
| H331 | Toxic if inhaled. |
| H311 | Toxic in contact with skin. |
| H301 | Toxic if swallowed. |
| H314 | Causes severe skin burns and eye damage. |
| H411 | Toxic to aquatic life with long lasting effects. |
Precautionary statements: P210, P233, P241, P242, P260, P270, P271, P273, P280, P301, P302, P304, P310, P330, P331, P352, P391, P403, P501
03 · Physical and chemical properties
Prop-2-yn-1-ol properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 113.89 °C (237 °F) | NIOSH | |
| 113.61 °C (236.5 °F) | at 760 mmHg | CAMEO | |
| 114 °C (237.2 °F) | ICSC | ||
| Melting point | -52.22 °C (-62 °F) | NIOSH | |
| -47.78 °C (-54 °F) | CAMEO | ||
| Density | 0.97 g/cm³ | NIOSH | |
| 0.9715 g/cm³ | at 20 °C | HSDB | |
| 0.9485 g/cm³ | at 20 °C | CAMEO | |
| Solubility | Miscible with benzene, chloroform, ethanol, 1,2-dichloroethane, ether, acetone, dioxane, tetrahydrofuran, pyridine; moderately sol in carbon tetrachloride | HSDB | |
| IMMISCIBLE WITH ALIPHATIC HYDROCARBONS | HSDB | ||
| Miscible with water | HSDB | ||
| Vapor pressure | 12 mmHg | NIOSH | |
| 15.6 mmHg | at 25 °C | HSDB | |
| Flash point | 36.11 °C (97 °F) | HSDB | |
| 32.78 °C (91 °F) | CAMEO | ||
| Lower explosive limit (LEL) | 3.4 % by volume | ICSC | |
| Closed containers may rupture violently when heated. | HSDB | ||
| May polymerize or decompose explosively. | decomposes | HSDB | |
| Upper explosive limit (UEL) | 70 % by volume | ICSC | |
| Vapor density | 1.93 (air = 1) | ICSC | |
| Odor threshold | 0.35 mg/cu m | HSDB | |
| Odor Threshold Low: 0.15 [ppm] | Haz-Map | ||
| Odor threshold from CHEMINFO | Haz-Map |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Prop-2-yn-1-ol
Storage conditions
Fireproof. Separated from strong oxidants, food and feedstuffs. Keep in the dark. Well closed.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Addition of phosphorus pentoxide to propargyl alcohol caused the alcohol to burst into flame.
Source: Hazardous Substances Data Bank (HSDB)
Planning storage for a mix of chemicals? Check Prop-2-yn-1-ol in the storage compatibility matrix →