Propyne (C3H4)
Specifications
- CAS No.: 74-99-7
- UN No.: 1954
- EINECS No.: 200-828-4
- Molecular Weight: 40.06 g/mol
- Appearance: Colorless
- Melting Point: -102.7 ℃
- Boiling Point: -23.2℃
- Density: 0.6070kg/m³
- Hazard Class (DOT): 2.1 & 8
- Label: flammable gas
High-purity propyne (C₃H₄) gas supplied from China for fuel gas blending, chemical synthesis, and specialty applications.
High-purity propyne (C₃H₄ / methyl acetylene) gas for MAPP gas production, organic synthesis, and specialty fuel applications.
Propyne, also known as methyl acetylene, is a colorless, flammable alkyne gas. As a component of MAPP (methyl acetylene-propadiene) gas, it is widely used as a fuel gas for oxy-fuel welding, cutting, and brazing applications. It is heavier than air and can form explosive mixtures when combined with air, requiring careful handling and storage. Propyne also serves as an intermediate in organic synthesis for producing various specialty chemicals. Typically, it is handled as a liquefied compressed gas and shipped in specialized cylinders.
Global Shipping & Export Compliance
Propyne (UN 1954) is classified as a flammable compressed gas and must be handled under strict hazardous materials regulations.
- Sea freight (FCL / LCL) – standard export method
- Air freight – limited availability (regulatory controlled)
Required Export Documents
- Material Safety Data Sheet (MSDS)
- Certificate of Analysis (COA)
- Dangerous Goods Declaration (DGD)
- UN-certified cylinder documentation
- Commercial invoice & packing list
How to Order Propyne Gas from China
- Send technical requirements (purity, cylinder specification, application)
- Receive quotation (EXW / FOB / CIF options)
- Confirm cylinder specification & compliance
- Review COA, MSDS, and certification documents
- Production, filling, and quality inspection
- Hazardous goods shipping arrangement
- Delivery and final inspection at destination
Common Mistakes When Buying Propyne Gas
- Choosing suppliers only based on lowest price
- Ignoring cylinder certification and pressure rating
- Not verifying purity and impurity levels
- Skipping third-party inspection before shipment
- Overlooking export documentation compliance
- Underestimating safety requirements for flammable gas handling
Packaging
| Gas Cylinder Specifications | Contents | |
|---|---|---|
| Cylinder Capacity | Cylinder Valve | Weight |
| Custom sizes available | Consult for valve options | Consult for fill weights |
Propyne is typically shipped in specialized cylinders. Please contact us for detailed packaging options and specifications.
Frequently Asked Questions
