Isobutylene(C4H8)
Specifications
- CAS No.: 115-11-7
- UN No.: 1055
- EINECS No.: 204-066-3
- Molecular Weight: 56.11 g/mol
- Appearance: Colorless
- Melting Point: -140 ℃
- Boiling Point: -6.9℃
- Density: 0.5879kg/m³
- Hazard Class (DOT): 2.1 & 8
- Label: flammable Gas
High-purity isobutylene (C₄H₈) gas supplied from China for polymer production, chemical synthesis, and fuel applications.
High-purity isobutylene (C₄H₈ / 2-methylpropene) for polyisobutylene manufacturing, butyl rubber production, chemical intermediate synthesis, and alkylation feed.
Isobutylene, also known as 2-methylpropene, is a colorless, flammable gas that is insoluble in water but readily soluble in ethanol, ether, and most organic solvents. As a branched-chain alkene, it exhibits high reactivity due to its carbon-carbon double bond, making it a valuable monomer for polymerization reactions. Isobutylene serves as a key feedstock for producing polyisobutylene, butyl rubber, and various chemical intermediates. It is also used in the production of antioxidant additives, fuel components, and specialty chemicals. The gas is typically transported as a liquefied compressed gas under pressure.
Global Shipping & Export Compliance
Isobutylene (UN 1055) 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 Isobutylene 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 Isobutylene Gas
- Choosing suppliers only based on lowest price
- Ignoring cylinder certification and pressure rating
- Not verifying moisture and impurity levels
- Skipping third-party inspection before shipment
- Overlooking export documentation compliance
Packaging
| Cylinder Capacity | Valve |
|---|---|
| 40L、72L、118L | CGA350/BFW-1 |
Industrial Grade Isobutylene(C4H8) 99.99%
| Specification | 99.99% |
|---|---|
| Propane/%（m/m） | <0.0010 |
| Propene/%（m/m） | <0.0010 |
| Butane/%（m/m） | 0.0071 |
| 2-Butene/%（m/m） | <0.0010 |
| 1-Butene/%（m/m） | <0.0010 |
| butadiene/%（m/m） | <0.0010 |
| Dimethyl ether/%（m/m） | <0.0005 |
| tert-butyl alcohol /%（m/m） | <0.0005 |
| Tert-butyl methyl ether/%（m/m） | <0.0005 |
| Moisture/%（m/m） | 0.00213 |
| Dimeric substance/%（m/m） | <0.0005 |
Frequently Asked Questions
