TOLUENE

CAS Number: 108-88-3 
 Synonyms: Methylbenzene, Methyl Benzol, Phenylmethane, Methacide, Tol, Tolu-sol, Monomethyl benzene
Toluene is a clear, water-insoluble liquid with a distinctive, sweet, pungent odor, similar to paint thinners. It is a naturally occurring hydrocarbon but is primarily produced during the process of refining crude oil and making gasoline. Chemically, it is an aromatic hydrocarbon, consisting of a methyl group (CH₃) attached to a phenyl group (a ring of six carbon atoms). Its molecular formula is C₇H₈ .
Toluene is an exceptionally versatile and widely used industrial solvent. Its primary use is as a precursor to benzene, but it is also a common solvent in many consumer and industrial products. It is a key ingredient in paints, paint thinners, silicone sealants, many chemical reactants, rubber, printing ink, adhesives (glues), lacquers, leather tanners, and disinfectants. In the petroleum industry, it is blended into gasoline to improve its octane rating .
Despite its utility, toluene is a hazardous substance that poses significant health risks. It is a central nervous system depressant. Acute (short-term) inhalation exposure can cause euphoria, confusion, dizziness, headaches, and memory loss, a state sometimes referred to as "huffing" when abused intentionally. Chronic (long-term) exposure, often in occupational settings, can lead to more severe and irreversible neurological damage, affecting coordination, hearing, and vision. It can also cause irritation of the eyes and respiratory tract, dry or cracked skin, and potential harm to the liver and kidneys. Due to these risks, its use in consumer products is often regulated, and it requires careful handling with proper ventilation and personal protective equipment 
 
Specific Applications and Benefits:
Industrial Solvent: This is its most significant use. It dissolves a vast array of materials, including:
Paints, Coatings, and Thinners: Used in lacquers, varnishes, and industrial finishes for its fast evaporation rate and strong solvency for resins.
Adhesives and Sealants: A key solvent in rubber cement, contact adhesives, and sealants.
Printing Inks: Dissolves pigments and resins for rotogravure and flexographic printing.
Chemical Feedstock:
Benzene Production: Toluene is chemically converted to benzene via hydrodealkylation.
Toluene Diisocyanate (TDI): A major use is its conversion to TDI, which is a key monomer used in the production of flexible polyurethane foams (for furniture, mattresses, and car seats).
Other Chemicals: Used to make benzoic acid, benzaldehyde, nitrotoluene, and other precursors for dyes, pharmaceuticals (e.g., saccharin), and explosives (TNT).
Gasoline Additive: Added to fuel to improve its octane rating, enhancing engine performance and preventing engine knocking.
Health and Safety Note: Toluene is a potent neurotoxin. Acute inhalation can cause euphoria and hallucinations (recreational abuse) but also leads to severe health effects. Chronic exposure is linked to irreversible brain damage, hearing loss, and kidney problems. It is also a reproductive toxin. Due to these risks, its use in consumer products like nail polish and hobby glues has been heavily restricted or phased out in many countries, replaced by safer alternatives.
 
Chemical Identity 
Molecular Formula: C₇H₈
Molecular Weight: 92.14 g/mol
EINECS Number: 203-625-9
InChI Key: InChI=1/C7H8/c1-7-5-3-2-4-6-7/h2-6H,1H3
Physical Properties 
Appearance: Colorless transparent liquid
Odor: Aromatic odor similar to benzene
Melting Point: -94.9°C
Boiling Point: 110.6°C at 760 mmHg
Flash Point: 4°C (closed cup)
Auto-ignition Temperature: 535°C
Density: 0.871 g/cm³ at 20°C
Relative Density (water=1): 0.87
Relative Vapor Density (air=1): 3.14
Vapor Pressure: 4.89 kPa at 30°C; 27.7 mmHg at 25°C
Solubility: 0.5 g/L in water at 20°C; insoluble in water, miscible with benzene, alcohol, ether, and most organic solvents
Critical Temperature: 318.6°C
Critical Pressure: 4.11 MPa
Log P (Octanol/Water): 2.69
Explosive Limits: 1.2% to 7.0% by volume in air
Primary Applications 
Industrial Solvent:
 Widely used as an organic solvent in numerous industries including:
Paints and coatings
Adhesives
Printing inks
Rubber and leather industries
Chemical Feedstock:
 Used as raw material for the synthesis of:
Toluene Derivatives: Various chemical intermediates
Pharmaceuticals: Drug synthesis
Dyes: Dyestuff intermediate
Explosives: Trinitrotoluene (TNT) production
Pesticides and Agrochemicals: Active ingredient synthesis
Resins and Polymers: Production of polyurethane foams via toluene diisocyanate (TDI)
Fuel Applications:
Gasoline Blending: Incorporated into gasoline to improve octane rating and combustion characteristics

SAFETY INFORMATION ABOUT TOLUENE

First aid measures:
Description of first aid measures:
General advice:
Consult a physician. 
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
 
If inhaled:
If breathed in, move person into fresh air. 
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately. 
Wash off with soap and plenty of water.
Consult a physician.
 
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
 
If swallowed:
Do NOT induce vomiting. 
Never give anything by mouth to an unconscious person. 
Rinse mouth with water. 
Consult a physician.
 
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
 
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment. 
 
Avoid breathing vapours, mist or gas. 
Evacuate personnel to safe areas.
 
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste. 
Keep in suitable, closed containers for disposal.
 
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
 
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place. 
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
 
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
 
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles. 
Faceshield (8-inch minimum). 
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
 
Skin protection:
Handle with gloves. 
Gloves must be inspected prior to use. 
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product. 
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. 
Wash and dry hands.
 
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
 
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls. 
 
If the respirator is the sole means of protection, use a full-face supplied air respirator. 
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so. 
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions. 
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
 
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company. 
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product