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Name: 2,2-Dimethylpentane
Chemical Formula: C7H16
Common Synonyms: Isooctane (though not true isooctane), Heptane, 2,2-dimethyl-
CAS Number: 590-35-2
GHS Classification: Flammable liquid and vapor, Category 2; Aspiration hazard, Category 1
Symbols: Flame, Health hazard
Signal Word: Danger
Hazard Statements: Highly flammable liquid and vapor. If swallowed, may enter airways and cause lung irritation or chemical pneumonia. Breathing high concentrations causes dizziness or drowsiness.
Precautionary Statements: Keep away from open flames, sparks, and hot surfaces. Avoid breathing vapors, wash hands thoroughly after handling.
Component: 2,2-Dimethylpentane
Concentration: Nearly 100% if pure
Impurities: Lower alkanes or related hydrocarbons sometimes show up, depending on supply chain, but people using this in labs usually look for high purity for experimental accuracy.
Eye Contact: Rinse carefully with plenty of water for several minutes. Remove contact lenses if present and easy to do.
Skin Contact: Wash with plenty of soap and running water. Remove contaminated clothing.
Inhalation: Move person to fresh air. If they feel unwell, call for medical advice.
Ingestion: Do not induce vomiting—danger of chemical pneumonia. Seek immediate medical attention.
General Advice: Exposed workers in busy industries should stay sharp about symptoms like headache, dizziness, cough, or breathing difficulty; no one should tough it out if there are warning signs.
Suitable Extinguishers: Use dry chemical, foam, or carbon dioxide. Never splash water directly—spreading fire is the last problem anyone wants.
Protective Equipment for Firefighters: Full protective gear, self-contained breathing apparatus.
Specific Hazards: Vapors form explosive mixtures with air. Heating up, these vapors can travel back to the ignition source and flash—firefighters face a risk beyond the visible flames.
Advice for Responders: Approach from upwind, keep containers cool by spraying with water at a safe distance.
Personal Precautions: Eliminate sources of ignition. Ventilate the affected area. Put on protective gloves and goggles.
Environmental Precautions: Block off drains to keep the spill from reaching waterways—hydrocarbons can wreak havoc on aquatic organisms.
Containment and Clean-Up: Soak up with inert material such as sand or earth. Shovel collected material into proper containers for disposal. Rinse site with plenty of water once absorbed material gets cleared up. Companies dealing with bulk storage must have routine and clear plans, not just for regulators but because surprises in cleanup cause workplace harm and environmental damage.
Safe Handling: Handle in well-ventilated areas. Avoid breathing vapors or mist. Keep away from sparks, open flames, static discharge sources. Always ground and bond containers when transferring the liquid.
Storage: Store in tightly closed, properly labeled containers, away from incompatible substances like strong oxidizers. Store in a cool, dry place with proper explosion-proof electrical fittings. Trained workers often know to avoid using plastic containers that attract static, but newcomers should get this explained.
Special Considerations: Segregate from food and feed. Providing spill kits near storage helps everyone act immediately in case of accidental leaks.
Occupational Exposure Limits: Short exposure: Threshold not officially set everywhere, but values for similar hydrocarbons suggest keeping levels below 300 ppm in most workplaces.
Engineering Controls: Local exhaust ventilation helps remove vapors from breathing zones. Safety showers and eye wash stations should not just exist on paper safety plans—they need to work, and people need to know where to find them.
Personal Protective Equipment: Nitrile gloves for hand protection. Goggles for eye protection. Flame retardant clothing in case of substantial exposure. If ventilation is poor, use NIOSH-approved respirator.
Appearance: Colorless, clear, liquid
Odor: Gasoline-like, hydrocarbon smell, noticeable at low concentrations
Boiling Point: Around 93-95°C (200-203°F)
Melting Point: -117°C (-178°F)
Flash Point: Roughly -12°C (10°F) — easily ignitable at room temperature
Auto-Ignition Temperature: About 243°C (469°F)
Vapor Pressure: Moderate, climbing with temperature
Solubility: Insoluble in water, mixes well with other organic solvents
Density: About 0.69 g/cm³
Chemical Stability: Stable at normal temperatures and pressures, but vapor builds up if not handled right.
Reactivity: Can react strongly with oxidizers—danger of fires or explosions.
Hazardous Decomposition: Burning releases irritating smoke—carbon monoxide, carbon dioxide. Firefighters and anyone nearby should expect rough air quality during a fire.
Routes of Exposure: Inhalation, ingestion, skin or eye contact
Symptoms: Dizziness, drowsiness, headache, nausea. Breathing high concentrations can depress the central nervous system.
Chronic Exposure: No classified risk of long-term illness at low, controlled exposure, but accidental or regular overexposure may damage the respiratory system or cause liver and kidney stress.
Sensitization: No clear evidence of allergic reactions from contact.
Carcinogenicity: Not listed as a carcinogen by IARC, NTP, or OSHA. Workplace experience shows that keeping exposures down, even for chemicals not labeled as highly toxic, avoids unpredictable long-term health issues for workers and nearby communities.
Toxicity to Aquatic Life: High—hydrocarbons like this are tough on fish and can kill invertebrates with small spills.
Persistence and Degradability: Tends to linger in soil and water, evaporates but leaves a chemical legacy in confined environments.
Bioaccumulation: Not much—volatility means it often evaporates rather than builds up, but can travel through air and contaminate distant territories.
Mobility: Flows easily through soil, spreading contamination fast if spilled in or near water.
Method: Incinerate in a chemical incinerator equipped with afterburner and scrubber, following local, regional, and national regulations.
Containers: Empty containers still contain vapors—ventilate and triple-rinse before recycling or disposal.
Precaution: Professional waste handlers often see homemade disposal or pouring down the drains—both contaminate water and get companies fined. Supervised disposal limits this public and environmental hazard.
UN Number: 1206 (Heptanes)
Proper Shipping Name: Heptanes, including 2,2-dimethylpentane
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: II (medium hazard)
Label: Flammable liquid
Precautions: Secure load, keep away from heat, avoid loading with oxidizers. Many drivers carrying such loads are trained to verify seals, grounding, and labeling, but oversight and refreshers go a long way to reducing risks on highways and in cities.
OSHA: Covered as a hazardous chemical under general workplace standards.
EPA: Subject to reporting for spills under CERCLA and Clean Water Act.
Right-To-Know Laws: Requires communication of hazards to workers and emergency personnel, and transparent labeling is not optional—it's a matter of real-world health and trust.
Global Inventories: Listed in TSCA and inventories in many major industrial nations.
