Phosphoric Acid Flame Retardant Grade

Name: Phosphoric Acid Flame Retardant Grade
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 7664-38-2

Flame retardant grade phosphoric acid is a high-purity orthophosphoric acid used as an acid catalyst and carbon-source activator in intumescent coating systems, wood fire retardant treatments, and cotton textile finishing. It reacts with polyols and nitrogenous compounds at elevated temperatures to form a dense phosphate char that insulates the substrate from heat. Industrial 75–85% concentrations are commonly used for direct treatment of cellulosic materials or as a feedstock for manufacturing ammonium phosphate salts.

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Technical Specifications

appearance	Colorless to pale yellow liquid
arsenic (ppm)	<5
heavy metals (ppm)	<10
phosphorus content (%)	24–28
specific gravity (20°C)	1.57–1.69
phosphoric acid content (%)	75–85

Applications

Wood and timber fire-retardant pressure-impregnation treatments
Cotton and cellulosic textile flame-retardant finishing
Intermediate for manufacturing MAP, DAP, and APP flame retardants
Acid source component in intumescent coating formulations
Paper and cardboard fire-retardant treatment for packaging

Key Features

High phosphoric acid concentration maximizes phosphorus delivery per unit volume for wood treatment
Reacts with cellulose and polyols to catalyze char formation and inhibit combustion
Low-cost and widely available FR raw material for manufacturing downstream phosphate FR salts
Broad compatibility with nitrogen synergists (urea, melamine) in intumescent coating systems