Physicochemical Characteristics & Quality Control Standard of 99% Min Pyrogallic Acid CAS 87-66-1 White Crystalline Powder

Technical Research Brief

Pyrogallic Acid CAS 87-66-1 is a typical polyhydric aromatic phenol supplied as white crystalline powder with minimum purity of 99%. This article focuses on its molecular reduction mechanism, oxidation properties and standardized quality control indicators, providing technical reference for raw material screening.

Pyrogallic Acid (CAS 87-66-1), also known as pyrogallol, features three hydroxyl groups attached to the benzene ring. This special molecular structure endows the substance with strong reducing capacity, which differs significantly from other monohydric and dihydric phenolic compounds. The active hydroxyl groups are susceptible to reactions with oxygen under light and ambient temperature, leading to gradual color change of solid powder and aqueous solutions. Such inherent chemical traits must be fully considered during raw material evaluation and storage design.

Disclaimer: This content only describes physicochemical properties and quality specifications. No application effect guarantee, solely for industrial technical research reference.

I. 99% Min Purity Standard and Impurity Control

The minimum 99% purity specification forms a critical threshold for industrial-grade Pyrogallic Acid. Low-grade products with insufficient purity contain extra organic impurities and moisture. These contaminants may interfere with redox reactions, cause unexpected side reactions and affect the stability of final products. Our standardized purification process strictly controls impurity content, stabilizing both chemical indicators and the white crystalline appearance of finished goods batch after batch.

II. Oxidation Principle and Professional Storage Requirements

Once exposed to light and air, Pyrogallic Acid will be oxidized and gradually turn grey or brown. Good sealing, shading and low-temperature environments can effectively slow down the oxidation process. Many raw material suppliers on the market fail to maintain consistent product color and purity across batches. Reliable refining technology and standardized packaging solutions help avoid quality fluctuation during long-distance transportation and inventory storage.

III. Batch Testing Documents and Technical Support

Each batch of Pyrogallic Acid CAS 87-66-1 comes with complete COA test reports covering purity, appearance, moisture and related impurity items. We provide professional suggestions on packaging, transportation and warehouse management according to its chemical characteristics to help customers reduce quality loss caused by improper handling.

Disclaimer: Actual stability depends on packaging mode, storage environment and shelf time.