Phthalic acid

Phthalic acid (CAS 88-99-3), also known as orthophthalic acid, is an aromatic dicarboxylic acid used across pharmaceutical, cosmetic, and specialty chemical manufacturing. It functions primarily as a pH buffer, acidulant, and catalyst precursor in synthesis and formulation processes.

In pharmaceutical manufacturing, phthalic acid serves as a buffering agent in tablet coatings and controlled-release formulations where precise pH management affects drug dissolution profiles. Cosmetic formulators incorporate it into pH-adjustment systems for creams and serums.

These rinse-off products require stability across a defined acidity range which is critical to shelf life. As a catalyst precursor, it is used in the production of phthalate esters and specialty resins where the acid form is the preferred starting material.

In preservation systems, its acidic character contributes to microbial control in formulations where low-pH environments are part of the preservation strategy. This versatility makes it a staple in modern chemical synthesis and industrial applications.

Phthalic acid is supplied as a white crystalline powder. Pharmaceutical-grade material meeting USP and BP specifications is available for regulated applications, ensuring high purity and compliance with international standards.

Technical-grade product serves industrial synthesis and resin manufacturing where high-volume production is required. Packaging options typically range from kilogram-scale bags to bulk sacks depending on the specific application volume and logistics.