For procurement professionals and technical buyers in the industrial chemical sector, a deep understanding of product specifications is paramount. P-Toluenesulfonyl Chloride (PTSC), commonly known by CAS number 98-59-9, is a chemical intermediate that demands attention to detail regarding its quality and properties. When sourcing this compound, especially from China manufacturers, knowing the critical specifications ensures that you acquire the right material for your application.

The appearance of PTSC is typically described as a white crystalline powder. This physical characteristic is an initial indicator of its quality. Beyond appearance, the assay or purity is the most critical specification. Industrial buyers should prioritize PTSC with a high purity, generally stated as ≥99.5%. This level of purity is often required for sensitive applications like pharmaceutical synthesis, where even minor contaminants can impact reaction yields and the quality of the final product.

Other important specifications to consider include moisture content and free acid levels. Low moisture content (e.g., ≤0.1%) is vital as PTSC can hydrolyze in the presence of water, potentially affecting its reactivity and shelf life. Similarly, a low free acid content (e.g., ≤0.2%), often referring to p-toluenesulfonic acid (PTSA), is desirable for maintaining product stability and preventing unwanted side reactions. The presence of ortho-toluenesulfonyl chloride (OTSC) is another factor; a specification of ≤0.2% for OTSC is common for high-grade PTSC.

When you are ready to buy P-Toluenesulfonyl Chloride, look for suppliers who clearly list these technical data points. Manufacturers often provide a Technical Data Sheet (TDS) that details these specifications. This documentation is crucial for verifying that the product meets your specific application requirements, whether it's for dye formulation, pharmaceutical research, or other organic synthesis processes.

For businesses sourcing these chemicals, understanding the packaging is also relevant. PTSC is commonly supplied in 50kg drums or 25kg fiber bags, ensuring safe transport and storage. Reliable suppliers will also provide Material Safety Data Sheets (MSDS) to guide safe handling practices, a critical aspect for any industrial chemical.

In conclusion, when procuring P-Toluenesulfonyl Chloride, pay close attention to its appearance, assay (purity), moisture content, free acid, and OTSC levels. Partnering with established China manufacturers who provide transparent and detailed specifications will ensure you obtain a high-quality chemical intermediate, supporting the success of your industrial processes.