Propyne
Also known as: 1-PROPYNE, ALLYLENE, Acetylene, methyl-, CH3CequivCH, EINECS 200-828-4, MFCD00036235, Methylacetylene, PROPYNE, PROPYNE, 99+%, Propine, Propyne 96%, methyl-acetylen, prop-1-yne, propargyl acid, propyne
Propyne (CAS 74-99-7) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C3H4 and a molecular weight of 40.06390 g/mol. Key properties include a melting point of −102.7 °C(lit.), a boiling point of −23.2 °C(lit.), a density of 0.648 g/cm3 and a flash point of -51 °C. It is classified under GHS with signal word Danger and hazard statements H220, H280 and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 74-99-7
- Jingsj CID
- J-1106847-7
- Molecular Formula
- C3H4
- Molecular Weight
- 40.06390 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | −102.7 °C(lit.) |
|---|---|
| Boiling Point | −23.2 °C(lit.) |
| Density | 0.648 g/cm3 |
| Flash Point | -51 °C |
| Exact Mass | 40.03130 |
| LogP | 0.63950 |
| Appearance | gas |
| Vapor Pressure | 204.6 mm Hg ( −49.5 °C) |
| Refractive Index | 1.363 |
GHS Safety & Compliance
- H220
- H280
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2901299090 |
|---|---|
| Summary | 2901299090 unsaturated acyclic hydrocarbons。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:2.0%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Propyne?
The CAS number of Propyne is 74-99-7.
What are the molecular formula and molecular weight of Propyne?
Propyne has molecular formula C3H4 and molecular weight 40.06390 g/mol.
Is Propyne hazardous?
Propyne has GHS signal word Danger and hazard statements H220; H280; H335 — May cause respiratory irritation.
What are the upstream and downstream products of Propyne?
For Propyne, Upstream Products: 1-bromopropene, Isobutylene, Propionaldehyde; Downstream Products: 2-Chloropropene, 2,2-Dichloropropane, Methyl isopropyl ether.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Propyne (CAS 74-99-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1106847-7 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.