Phosphorous acid

Phosphorous acid (CAS 10294-56-1) is an inorganic acid used industrially as a reducing agent, chelating agent, and corrosion inhibitor across a broad range of chemical processing applications.

It functions primarily to control pH, sequester metal ions, and stabilize formulations against oxidative degradation. In water treatment, it acts as a scale inhibitor and corrosion control agent in cooling water systems.

Agricultural formulations use it as a precursor to phosphonate-based fungicides and as a direct active component in crop protection products targeting oomycete pathogens. It is essential for modern farming.

In textile and leather processing, it supports pH regulation during dyeing and tanning operations where precise acid control affects product consistency. This ensures high-quality finishes in manufacturing.

Pharmaceutical and chemical manufacturers use it as a reducing intermediate in synthesis and as a stabilizer in formulations sensitive to metal-catalyzed oxidation. It is a versatile chemical building block.

Phosphorous acid is supplied as a white crystalline solid or as an aqueous solution, with solution concentrations typically at 70% being the most commercially traded form for global logistics.

Technical grade is standard for industrial applications including water treatment, agriculture, and metal processing. These grades provide reliable performance for large-scale industrial operations and systems.

Higher purity grades are available for pharmaceutical synthesis and specialty chemical manufacturing where tighter specifications are required. These meet the rigorous demands of sensitive chemical processes.