Tetrakis(hydroxymethyl)phosphonium Sulfate (THPS)

Name: Tetrakis(hydroxymethyl)phosphonium Sulfate (THPS)
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 124-64-1

Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) is a reactive organophosphorus flame retardant and biocide widely used for durable flame retardant finishing of cotton and cotton-blend textiles. It forms a cross-linked three-dimensional phosphorus network within cellulose fiber upon curing, providing wash-durable flame retardancy that withstands 50+ industrial launderings. THPS-treated fabrics meet EN ISO 15025, EN 11611, and NFPA 701 standards required for protective workwear.

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Technical Specifications

pH (neat)	2.0–4.0
appearance	Colorless to pale yellow liquid
water solubility	Miscible
phosphorus content (%)	11–12
active THPS content (%)	75–80
specific gravity (20°C)	1.35–1.40

Applications

Durable flame-retardant finishing of cotton workwear and protective clothing
Military and defense FR fabric treatment meeting NATO and MIL-SPEC requirements
Industrial fire-retardant uniforms for oil and gas, electrical, and chemical industries
Cotton theatrical and stage curtain FR treatment
Biocidal treatment of oilfield injection water as secondary application

Key Features

Reactive cross-linking mechanism provides wash-durable FR performance surviving 50+ industrial laundry cycles
Low add-on levels (15–20% on fabric weight) with minimal handle change versus untreated fabric
Meets EN ISO 15025 and EN 11611 standards for protective workwear in high-risk industries
Dual-function product: FR finishing and biocidal activity in oilfield water treatment applications