Octane

C8H18

octane

CAS111-65-9

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Identification

CAS Number
111-65-9
EC Number
203-892-1
UN Number
1262
Index Number
601-009-00-8
PubChem CID
356

Physical-chemical properties

Molecular Formula
C8H18
Molar Mass
114.23 g/mol
IUPAC Name
octane

Chemical Identifiers

InChI
InChI=1S/C8H18/c1-3-5-7-8-6-4-2/h3-8H2,1-2H3
InChI Key
TVMXDCGIABBOFY-UHFFFAOYSA-N

Overview

Octane (CAS 111-65-9) is a saturated hydrocarbon with eight carbon atoms featuring excellent fuel properties and high volatility characteristics. Octane represents a fundamental alkane compound in the petroleum industry, serving as both a key component in gasoline formulations and an important reference standard for fuel quality assessment. This colorless liquid hydrocarbon exhibits the typical properties of straight-chain alkanes, including low water solubility and high flammability characteristics that classify it under ADR class 3 for transportation purposes. The compound's molecular structure C8H18 contributes to its significant role in octane rating systems, where it serves as the primary reference point for measuring anti-knock properties in internal combustion engines. Its relatively low boiling point of approximately 125°C and density of around 0.7 g/cm³ make it particularly suitable for fuel applications where volatility and energy density are crucial factors. From a safety perspective, octane requires careful handling due to its flammable nature and potential vapor accumulation. While not classified with specific GHS pictograms, proper ventilation and fire prevention measures remain essential during storage and processing operations. The substance may cause mild irritation upon prolonged skin contact and should be handled with appropriate personal protective equipment. Industrial applications of octane span across fuel blending operations, where it works alongside compounds such as 2-ethylbutyl acetate in specialized formulations, solvent applications in chemical processing, and as a reference standard in analytical laboratories. The petrochemical industry also utilizes octane as a starting material for various synthetic processes and as a component in cleaning solutions where hydrocarbon solvents are required. OYSI maintains reliable supply chains for octane to support diverse industrial requirements across European markets, ensuring consistent availability for qualified commercial applications.

Safety & Classification

No Hazard Classification

This substance is not classified as hazardous according to CLP Regulation (EC) No 1272/2008.

Transport (ADR)

UN Number1262
ADR Class3
Packing GroupII
Tunnel CodeD/E
Proper Shipping NameOctan
Marine PollutantNo

Frequently Asked Questions

What is octane?

Octane is a straight-chain alkane hydrocarbon with the molecular formula C8H18 and CAS number 111-65-9. It consists of eight carbon atoms connected in a linear chain, each saturated with hydrogen atoms. With a molecular weight of 114.23 g/mol, octane is a colorless, flammable liquid at room temperature. It belongs to the family of saturated hydrocarbons and serves as an important component in petroleum products and various industrial applications.

What are the physicochemical properties of octane?

Octane is a colorless, transparent liquid with a characteristic gasoline-like odor at room temperature. It has a boiling point of approximately 125.7°C and a melting point of -56.8°C. The substance is highly hydrophobic, meaning it is insoluble in water but readily dissolves in organic solvents such as alcohols, ethers, and other hydrocarbons. Its density is approximately 0.703 g/cm³, making it lighter than water and highly volatile.

What is octane used for?

Octane is primarily used as a reference standard for measuring gasoline quality and engine performance through the octane rating system. It serves as a solvent in various industrial processes and chemical synthesis applications. Additionally, octane functions as a fuel component and is utilized in the production of specialty chemicals. Its properties make it valuable in research laboratories for calibration purposes and as a non-polar solvent in analytical chemistry applications.

How to handle octane safely?

Octane requires careful handling due to its flammable nature and vapor formation. Always wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Ensure adequate ventilation to prevent vapor accumulation and eliminate ignition sources such as sparks, flames, or hot surfaces. Use explosion-proof electrical equipment when working with octane. Avoid skin and eye contact, and prevent inhalation of vapors through proper ventilation or respiratory protection when necessary.

How to store octane correctly?

Octane must be stored in a cool, dry, well-ventilated area away from heat sources, sparks, and flames. Use appropriate containers made of compatible materials such as steel or suitable plastics, ensuring they are properly sealed to prevent vapor escape. Store away from oxidizing agents and strong acids to avoid dangerous reactions. Maintain storage temperatures below 25°C when possible and ensure proper grounding of containers to prevent static electricity buildup during handling.

What to do in case of contact with octane?

Octane contact requires immediate action depending on exposure type. For skin contact, remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. In case of eye contact, flush immediately with clean water for 15 minutes while holding eyelids open. If vapors are inhaled, move the person to fresh air immediately. For ingestion, do not induce vomiting and seek medical attention promptly while providing fresh air.

How to dispose of octane appropriately?

Octane disposal must comply with local and European waste regulations as it is classified as hazardous waste. Never dispose of octane down drains, sewers, or onto the ground as it can contaminate water sources and soil. Contact licensed waste disposal companies that specialize in flammable liquid waste treatment. Small quantities may be suitable for solvent recycling programs, while larger volumes require professional incineration at authorized facilities equipped to handle hydrocarbon waste safely.

How to transport octane?

Octane is classified under ADR Class 3 (flammable liquids), Packing Group II, requiring specific transport protocols. Use UN-approved packaging designed for flammable liquids with proper labeling and documentation. Transport vehicles must carry appropriate fire extinguishing equipment and emergency response information. Drivers need ADR certification for dangerous goods transport. Ensure proper ventilation during transport and avoid routes through populated areas or near water sources when possible, following all applicable dangerous goods regulations.

Is octane subject to specific regulations?

Octane is regulated under various European frameworks including REACH registration requirements for commercial use. While not classified as a SVHC (Substance of Very High Concern), it must comply with CLP regulation labeling for flammable substances. Transport falls under ADR dangerous goods regulations as Class 3 material. Additionally, workplace exposure limits may apply under occupational health directives, and environmental discharge restrictions are governed by water protection and air quality legislation across EU member states.

Where to buy octane in Europe?

Octane is available through OYSI, a European distributor specializing in technical chemical products. OYSI provides high-quality octane suitable for industrial applications, research purposes, and technical uses across European markets. As an established chemical distributor, OYSI ensures proper documentation, regulatory compliance, and reliable supply chains for octane and other specialty chemicals. Contact OYSI directly for specific grade requirements, quantities, and delivery options to your location within Europe.

Data Sources

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