Naphthalene

Naphthalene is an aromatic hydrocarbon with the molecular formula C10H8 and CAS number 91-20-3. It consists of two fused benzene rings forming a bicyclic structure with a molecular weight of 128.17 g/mol. This white crystalline solid is naturally found in coal tar and petroleum, and is classified as a Category 2 carcinogen with acute toxicity properties. It exhibits characteristic aromatic properties and is highly toxic to aquatic life with long-lasting effects.

Naphthalene is a white crystalline solid at room temperature with a distinctive mothball-like odor. It has a melting point of 80.2°C and boiling point of 218°C. The substance is poorly soluble in water but readily dissolves in organic solvents such as alcohol, ether, and benzene. It sublimes easily at room temperature, transitioning directly from solid to vapor phase, which contributes to its characteristic strong odor and volatility.

Naphthalene is primarily used as a raw material in the production of phthalic anhydride, which is essential for manufacturing plasticizers, resins, and dyes. It serves as an intermediate in the synthesis of various chemicals including naphthalene sulfonates, used as concrete admixtures and dispersants. Historically used in mothballs, this application has declined due to health concerns. Industrial applications also include wood preservatives, textile processing aids, and as a feedstock for specialty chemicals production.

Naphthalene requires careful handling due to its carcinogenic and toxic properties. Always wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and respiratory protection when handling. Work in well-ventilated areas or under fume hoods to prevent inhalation of vapors. Avoid skin contact and ingestion. Due to its GHS08 and GHS07 pictograms indicating health hazards, implement strict hygiene measures and ensure workers are properly trained on safe handling procedures.

Naphthalene should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat sources and ignition sources due to its ADR Class 4.1 flammable solid classification. Keep containers upright and properly labeled with hazard information. Store away from incompatible materials such as strong oxidizing agents. Due to its tendency to sublime, ensure containers are vapor-tight. Implement appropriate fire prevention measures and maintain storage temperatures below 40°C to minimize vapor generation.

Naphthalene exposure requires immediate action due to its acute toxicity. For skin contact, immediately remove contaminated clothing and wash affected area thoroughly with soap and water for at least 15 minutes. If inhaled, move person to fresh air immediately and seek medical attention if breathing difficulties occur. In case of eye contact, rinse immediately with plenty of water for at least 15 minutes. For ingestion, do not induce vomiting and seek immediate medical attention. Always consult a physician in case of exposure.

Naphthalene disposal must comply with local and European waste regulations due to its hazardous classification and environmental toxicity (GHS09). It cannot be disposed of as ordinary waste and requires treatment as hazardous chemical waste. Contact licensed hazardous waste disposal companies for proper collection and treatment. Small quantities may be incinerated at authorized high-temperature facilities. Never discharge naphthalene into drains, soil, or water bodies due to its aquatic toxicity classification (Aquatic Acute 1; Aquatic Chronic 1).

Naphthalene is classified under ADR as Class 4.1 flammable solid, Packing Group III, requiring specific transport regulations. It must be packaged in approved containers with proper hazard labels and documentation. Transport vehicles must carry appropriate safety equipment and emergency response information. Drivers require ADR certification for dangerous goods transport. Packages must display the correct UN number, proper shipping name, and hazard pictograms. Ensure transport in well-ventilated vehicles and avoid exposure to heat sources during transit.

Naphthalene is subject to comprehensive European chemical regulations under REACH and CLP frameworks due to its hazardous classification as Carc. 2 and environmental toxicity. It requires safety data sheets, hazard labeling with Warning signal word and specific pictograms (GHS08, GHS07, GHS09). Although not currently listed as SVHC, its carcinogenic properties mean it may face future restrictions. Companies must comply with occupational exposure limits, environmental discharge regulations, and worker protection requirements under various EU directives.

Naphthalene is available through OYSI, a specialized European distributor of technical chemicals. As an established chemical supplier, OYSI can provide naphthalene with proper documentation, safety data sheets, and regulatory compliance for industrial applications. Given naphthalene's hazardous classification, it's essential to source from reputable distributors who ensure proper handling, packaging, and transport according to ADR regulations. Contact OYSI directly for availability, specifications, and technical support for your naphthalene requirements across European markets.