2-methylpropane

C4H10

CAS75-28-5
GHS02 Gefahrensymbol: Entzündbar – Flamme
GHS04 Gefahrensymbol: Unter Druck stehende Gase – Gasflasche
Danger

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Identification

CAS Number
75-28-5
EC Number
200-857-2
UN Number
1969
Index Number
601-004-00-0
PubChem CID
6360

Physical-chemical properties

Molecular Formula
C4H10
Molar Mass
58.12 g/mol
IUPAC Name
2-methylpropane

Chemical Identifiers

InChI
InChI=1S/C4H10/c1-4(2)3/h4H,1-3H3
InChI Key
NNPPMTNAJDCUHE-UHFFFAOYSA-N

Overview

2-methylpropane (CAS 75-28-5) is a branched alkane hydrocarbon with highly flammable properties and gaseous state at ambient conditions. This saturated hydrocarbon, also known commercially as isobutane, represents one of the four structural isomers of butane with the molecular formula C4H10. As a liquefied petroleum gas (LPG), 2-methylpropane exhibits distinctive branched-chain characteristics that differentiate it from its linear counterpart, n-butane. The compound's branched structure contributes to its lower boiling point of approximately -11.7°C, making it particularly valuable in applications requiring controlled volatility. The substance presents significant safety considerations due to its classification as a flammable gas category 1 and pressurized gas under GHS regulations. Its vapor forms explosive mixtures with air across a wide concentration range, necessitating strict handling protocols and appropriate ventilation systems. Storage requires pressurized containers due to its gaseous nature at standard temperature and pressure conditions. 2-methylpropane finds extensive industrial application as a propellant in aerosol products, where its controlled pressure characteristics and clean combustion properties make it superior to many alternatives. The petrochemical industry utilizes it as a feedstock for alkylation processes and as a refrigerant in specialized cooling systems. Additionally, it serves as a fuel component in portable heating applications and camping equipment, often in blended formulations. Unlike simpler hydrocarbons such as prop-1-ene or methoxymethane, 2-methylpropane's branched structure provides enhanced octane characteristics when used in fuel applications. Its chemical stability and predictable behavior under controlled conditions make it a preferred choice for precision industrial processes requiring consistent performance parameters. OYSI maintains reliable supplies of technical-grade 2-methylpropane to serve diverse European industrial requirements.

Safety & Classification

Danger
Classification:

Flam. Gas 1; Press. Gas

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H220

Extremely flammable gas.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Transport (ADR)

UN Number1969
ADR Class2
Packing Group
Tunnel CodeB/D
Proper Shipping NameIsobutan, unter Druck verflüssigt
Marine PollutantNo

Frequently Asked Questions

What is 2-methylpropane?

2-methylpropane is a branched alkane hydrocarbon with the molecular formula C4H10 and CAS number 75-28-5. Also known as isobutane, it is a colorless, flammable gas at room temperature with a molecular weight of 58.12 g/mol. This saturated hydrocarbon belongs to the butane family and exists as a structural isomer of normal butane, featuring a branched carbon chain structure that gives it distinct physical and chemical properties compared to its linear counterpart.

What are the physicochemical properties of 2-methylpropane?

2-methylpropane is a colorless gas at standard temperature and pressure with a faint petroleum-like odor. It has a boiling point of -11.7°C and a melting point of -159.6°C, making it gaseous under normal conditions. The compound is highly flammable and poorly soluble in water but readily soluble in organic solvents. It has a density lower than air when liquid but behaves as a compressed gas under normal storage conditions, requiring pressurized containers.

What is 2-methylpropane used for?

2-methylpropane is primarily used as a refrigerant in cooling systems and as a propellant in aerosol products. It serves as a fuel component in portable camping stoves and lighters due to its clean-burning properties. In industrial applications, it functions as a feedstock for petrochemical processes and as a blowing agent in foam production. The compound is also utilized in the manufacture of synthetic rubber and as a solvent in various chemical processes requiring low-boiling point solvents.

How to handle 2-methylpropane safely?

2-methylpropane requires careful handling due to its flammable gas classification and pressurized nature. Always wear appropriate PPE including safety glasses, flame-resistant clothing, and work in well-ventilated areas away from ignition sources. Use explosion-proof electrical equipment and ensure proper grounding of containers during transfer operations. Never smoke or use open flames near the substance, and always handle containers gently to prevent damage to pressure relief systems. Keep emergency eyewash and shower stations readily accessible.

How to store 2-methylpropane correctly?

2-methylpropane must be stored in approved pressure vessels designed for flammable gases in cool, well-ventilated areas away from heat sources and ignition points. Store cylinders upright and secured to prevent falling, maintaining temperatures below 50°C to prevent excessive pressure buildup. Keep containers away from oxidizing agents and ensure adequate separation distances from incompatible materials. Storage areas should have appropriate fire suppression systems and be clearly marked with hazard signage indicating flammable gas presence.

What to do in case of contact with 2-methylpropane?

2-methylpropane exposure primarily occurs through inhalation since it exists as a gas. Remove the affected person immediately to fresh air and keep them at rest in a comfortable breathing position. If breathing difficulties occur, provide oxygen and seek immediate medical attention. In case of liquid contact with skin during handling of pressurized containers, treat for cold burns and remove contaminated clothing. For eye contact, rinse thoroughly with water and seek medical advice. Never induce vomiting if accidentally ingested.

How to dispose of 2-methylpropane appropriately?

2-methylpropane disposal must comply with local and European waste regulations for flammable gases. Empty containers should be depressurized safely by qualified personnel and disposed of through authorized hazardous waste collection services. Never release the gas directly into the atmosphere or sewer systems. Unused product should be returned to the supplier when possible or disposed of at licensed hazardous waste facilities. Always consult local environmental authorities for specific disposal requirements and maintain proper documentation of disposal activities.

How to transport 2-methylpropane?

2-methylpropane is classified as ADR Class 2 dangerous goods for transport, requiring specialized handling procedures and documentation. Transportation must use approved pressure vessels and vehicles equipped for flammable gas transport. Proper ADR labeling with GHS02 and GHS04 pictograms must be displayed, and transport documents must include the substance's UN number and hazard classification. Only trained and certified personnel should handle loading, transport, and unloading operations following strict safety protocols and emergency response procedures.

Is 2-methylpropane subject to specific regulations?

2-methylpropane is regulated under European CLP regulation with Flam. Gas 1 and Press. Gas classifications, requiring appropriate hazard labeling and safety data sheets. It falls under REACH registration requirements for chemical substances but is not currently listed as an SVHC (Substance of Very High Concern). Transport is governed by ADR regulations for dangerous goods, and workplace exposure limits may apply under occupational health regulations. Users must comply with national implementation of these EU directives and maintain appropriate safety documentation.

Where to buy 2-methylpropane in Europe?

2-methylpropane is available through OYSI, a trusted European distributor of technical chemicals serving industrial customers across the continent. OYSI provides quality chemical products with proper documentation, safety data sheets, and regulatory compliance support. As a specialized chemical distributor, OYSI ensures reliable supply chain management and technical support for industrial applications. Contact OYSI directly for availability, specifications, and delivery options to meet your specific requirements while ensuring full regulatory compliance and safe handling procedures.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.