P-Toluidine, chemically known as 4-aminotoluene or p-methylaniline (CAS No. 106-49-0), is a crucial aromatic amine and one of three isomeric toluidines, distinct from its ortho and meta counterparts by the para-positioning of its methyl group relative to the amino functional group. Discovered in 1845, this versatile compound has since become indispensable in various industrial sectors, thanks to its unique chemical structure and reactivity.

Key Physical and Chemical Properties
P-Toluidine typically appears as a white to light yellow crystalline powder or flaky solid, often with a lustrous sheen. It possesses a molecular formula of C7H9N and a molecular weight of approximately 107.15 g/mol. Its physical characteristics include a melting point ranging from 41 to 46 °C and a boiling point between 197 and 202 °C. The compound has a density of about 0.97 to 1.05 g/cm3 and a flash point around 88 to 90 °C, indicating its flammability under specific conditions. While poorly soluble in pure water, p-toluidine readily dissolves in organic solvents such as ethanol, pyridine, diethyl ether, acetone, methanol, and dilute acids, forming ammonium salts. Its weakly basic nature is attributed to the amino group directly bonded to the aromatic ring. It is sensitive to air and light, necessitating proper storage conditions.

Diverse Applications Across Industries
The utility of p-toluidine stems from its role as a key chemical intermediate in numerous synthesis processes. One of its primary applications is in the manufacture of various dyes, including textile dyestuffs, paper dyestuffs, and other colorants, where it contributes to vibrant and stable pigments. It is also vital in the production of organic chemicals and aromatic azo compounds.

Beyond colorants, p-toluidine finds significant use in the agricultural sector as an intermediate for producing crop protection agents, such as certain fungicides, insecticides, and herbicides. Its versatility extends to the pharmaceutical industry, serving as an essential building block for various pharmaceutical agents.

Furthermore, p-toluidine is a component in accelerators for cyanoacrylate glues, contributing to their quick-setting properties. It can react with formaldehyde to form Tröger's base, a compound with distinct structural characteristics. In analytical chemistry, it can serve as a reagent for substances like lignin and nitrites, and it reacts with catecholamine to form a dye used in spectrophotometric determinations. Its applications also encompass the manufacturing of printing inks, polymer auxiliaries, and even specific types of lubricants and oils.

Quality and Supply
As a reputable chemical manufacturer and supplier, we understand the critical importance of purity and consistency for industrial applications. Our p-toluidine meets stringent quality standards, ensuring an assay of ≥99.0%. We offer versatile packaging options, including standard 25 kg drums, with the flexibility to accommodate specific customer requirements. For those looking to buy p-toluidine, our commitment is to provide a product that upholds the highest levels of quality and safety.

When considering the price of p-toluidine, factors such as quantity and purity are significant. We strive to offer competitive pricing for both small-scale and bulk purchase orders, ensuring accessibility for diverse industrial needs. Our extensive experience in the chemical industry positions us as a reliable partner for your supply chain requirements. Proper storage in a cool, well-ventilated area is recommended to maintain product integrity and safety.