| Name | 2-Butyne |
| Synonyms | Butyne 2-Butyne But-2-yne CH3CequivCCH3 CROTONYLENE(DOT) Crotonylenetylene Crotonylene, Dimethylacetylene |
| CAS | 503-17-3 |
| EINECS | 207-962-2 |
| Molecular Formula | C4H6 |
| Molar Mass | 54.09 |
| Density | 0.691 g/mL at 25 °C(lit.) |
| Melting Point | -32 °C |
| Boling Point | 27 °C(lit.) |
| Flash Point | -25 °C |
| Water Solubility | Not miscible in water. |
| Vapor Presure | 11.47 psi ( 20 °C) |
| Refractive Index | n20/D 1.393(lit.) |
| Risk Codes | R12 - Extremely Flammable R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S16 - Keep away from sources of ignition. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| UN IDs | UN 1144 3/PG 1 |
| Vapor pressure | 11.47 psi ( 20 °C) |
| refractive index | n20/D 1.393(lit.) |
| flash point | -25 °C |
| storage conditions | 2-8°C |
| morphology | Liquid |
| color | Clear colorless to light yellow |
| Specific gravity | 0.691 |
| water solubility | Not miscible in water. |
| BRN | 1361340 |
| EPA chemical information | 2-Butyne (503-17-3) |
| WGK Germany | 3 |
| RTECS number | GQ7210000 |
| TSCA | Yes |
| HazardClass | 3 |
| PackingGroup | I |
| customs code | 29012990 |