Naphthalene

When purchasing Naphthalene, the purity level is the most critical factor, typically categorized into Crude Naphthalene (95-98%) and Refined Naphthalene (min 99.5%). For chemical synthesis, ensure the crystallizing point is at least 79.5°C to 80.2°C. Additionally, monitor the sulfur content (ideally <500 ppm for refined grades) and non-volatile residue, as these impurities can significantly affect the quality of downstream products like phthalic anhydride or synthetic resins.

Naphthalene is classified as a Hazardous Material (Class 4.1 Flammable Solid). Suppliers must provide a valid Material Safety Data Sheet (MSDS/SDS) compliant with the GHS (Globally Harmonized System). For exports to the EU, REACH registration is mandatory. If the product is intended for use as a pesticide or moth repellent, it must comply with regional regulations such as the EPA (USA) or BPR (EU) regarding labeling and concentration limits.

Buyers should request a Certificate of Analysis (COA) for every batch. It is highly recommended to engage third-party inspection services like SGS or Intertek to perform Gas Chromatography (GC) testing to verify purity. Furthermore, check the color (Hazen/APHA) in the molten state; high-quality refined naphthalene should be water-white or slightly yellowish, indicating low oxidation and impurity levels.

Naphthalene is a versatile chemical intermediate. Its primary application is the production of Phthalic Anhydride, used in plasticizers and alkyd resins. It is also essential for manufacturing Naphthalene Sulfonate Formaldehyde (NSF), a high-range water reducer for concrete admixtures. Other scenarios include the production of dyes, synthetic tanning agents, and mothballs for household pest control.

Due to its sublimation properties and flammability, Naphthalene must be packed in UN-approved packaging, typically 25kg or 50kg woven bags with PE liners or Jumbo bags. For long-distance sea freight, ensure the containers are kept in a cool, well-ventilated area away from heat sources. Buyers should confirm the supplier's experience in handling Dangerous Goods (DG) containers to avoid port rejection.

To ensure transaction security, use Trade Assurance or Letters of Credit (L/C) for large volumes. Prioritize suppliers on Made-in-China.com who have undergone Audited Supplier verifications. Always verify the supplier's Production License for Hazardous Chemicals to ensure they are a legitimate manufacturer rather than an unlicensed middleman, which reduces the risk of supply chain disruption due to environmental inspections.

Naphthalene prices are closely tied to coal tar and crude oil market fluctuations. Buyers should negotiate based on volume-based pricing tiers, typically seeking discounts for orders exceeding 20-ton (1 FCL) increments. It is advisable to sign long-term framework agreements with price adjustment formulas linked to raw material indices to stabilize costs against market volatility.

Be aware of Anti-dumping duties that may apply between specific countries (e.g., duties on Chinese naphthalene in certain markets). Always check the HS Code (typically 2902.90) against your local customs tariff schedule. Ensure all Export Licenses are secured by the supplier, as Naphthalene is often subject to strict environmental and export controls in major producing nations.