For any chemical intermediate to perform optimally in demanding industrial applications, its specifications must be clearly defined and consistently met. 1-Naphthol (CAS 90-15-3), a critical compound used in dyes, pharmaceuticals, and beyond, is no exception. Understanding the key specifications that leading manufacturers provide is crucial for procurement professionals and R&D scientists alike, ensuring they source material that meets their precise needs.

The most fundamental specification for 1-Naphthol is its purity, typically measured by High-Performance Liquid Chromatography (HPLC) or Gas Chromatography (GC). While general-purpose grades might suffice for some applications, industries like pharmaceuticals and high-performance dyes demand a purity level of ≥99.0%. This high purity ensures minimal interference from byproducts during complex chemical reactions, leading to more predictable outcomes and higher yields. Manufacturers often highlight assay results, such as a ≥99.5% GC assay, as a testament to their product's quality.

Another vital characteristic is the physical appearance. 1-Naphthol is commonly supplied as off-white to light grey flakes. Deviations from this description, or the presence of discoloration, might indicate degradation or contamination, prompting further investigation into the manufacturing and storage conditions.

Impurity profiling is equally important. Key impurities to monitor in 1-Naphthol include 2-Naphthol and 1-Naphthylamine. Low levels of these impurities, for example, ≤0.2% for 2-Naphthol and ≤0.1% for 1-Naphthylamine, are indicators of a well-controlled manufacturing process. These limits are critical because these impurities can affect reaction kinetics, product color, and even the safety profile of downstream products, particularly in pharmaceutical applications.

Furthermore, the solidifying point is a reliable indicator of purity. A solidifying point of ≥94.5℃, as often specified, confirms the crystalline integrity and purity of the 1-Naphthol. Low boiling matter should also be kept to a minimum (≤0.1%) to ensure efficient processing and minimal loss during reactions.

When you decide to buy 1-Naphthol, partnering with a manufacturer that clearly states these specifications and provides supporting documentation like a Certificate of Analysis (CoA) is essential. This commitment to quality assurance from a reputable supplier, especially a leading manufacturer in China, provides the confidence needed for critical industrial processes.