Tris(Hydroxymethyl) Phosphine Oxide (THPO)

THPO is synthesized through controlled oxidation processes, resulting in a white to off-white crystalline powder that is odorless and highly stable under normal conditions. Its unique phosphine oxide structure enables covalent bonding during polymerization, providing long-lasting protection against ignition and flame spread.

Brand:
aozun
Synonym:
Tris(Hydroxymethyl) Phosphine Oxide (THPO)
Appearance:
Colorless or pale yellow liquid
CAS No.:
1067-12-5
Molecular Formula:
O=P(CH2OH)3
Molecular Weight:
140
EINECS:
213-924-6
Solubility:
Soluble in water

Availability:



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Product Description

Product Description

Key Features and Benefits

High Reactivity: Integrates seamlessly into resin systems, forming durable bonds that resist leaching and migration.
Eco-Friendly Profile: Phosphorus-based mechanism reduces smoke generation and toxic gas emissions compared to halogenated alternatives.
Thermal Stability: Maintains efficacy up to 300°C, ideal for high-heat environments.
Water Solubility: Easily disperses in aqueous formulations, simplifying processing in textiles and coatings.
Low Volatility: Ensures consistent performance without evaporation during manufacturing or end-use.

Applications

THPO excels in demanding scenarios requiring superior flame retardancy. Primary uses include:

Textiles and Fabrics: Applied in cotton, polyester, and blended fibers to meet stringent fire safety standards like NFPA 701.
Coatings and Paints: Enhances intumescent properties in waterborne and solvent-based systems for wood, steel, and plastic substrates.
Polymers and Resins: Incorporated into polyurethane foams, epoxy resins, and PVC for electronics, automotive, and construction materials.
Adhesives: Improves fire resistance in structural bonding agents for aerospace and marine industries.
Paper and Wood Treatment: Provides protective layers for archival documents, furniture, and building panels.

By leveraging THPO, manufacturers can achieve UL 94 V-0 ratings and comply with global regulations such as REACH and RoHS.

Product Specifications

Property	Specification
CAS Number	1067-12-5
EC Number	213-924-8
Molecular Formula	C₃H₉O₄P
Molecular Weight	140.08 g/mol
Appearance	White to off-white crystalline powder
Purity (HPLC)	≥99.0%
Melting Point	170-175°C
Solubility in Water	>500 g/L at 20°C
pH (10% Aqueous Solution)	4.0-6.0
Moisture Content	≤0.5%
Packaging	25 kg fiber drums
Shelf Life	24 months in sealed containers

Note: Custom specifications available upon request. All batches undergo rigorous quality control to ensure consistency.

Safety and Handling Information

THPO is classified as non-hazardous under normal handling but requires standard precautions to prevent irritation. Key guidelines include:

Personal Protective Equipment (PPE): Wear chemical-resistant gloves, safety goggles, and protective clothing. Use NIOSH-approved respirators in dusty environments.
Storage: Keep in a cool, dry, well-ventilated area away from strong oxidizers. Store below 40°C in original packaging.
First Aid: In case of skin contact, wash with soap and water. For eye exposure, rinse immediately with copious amounts of water for 15 minutes and seek medical attention.
Environmental: Dispose of in accordance with local regulations. THPO is biodegradable under aerobic conditions and poses low aquatic toxicity.

For detailed Safety Data Sheet (SDS), contact our team.

Frequently Asked Questions (FAQs)

What is Tris(Hydroxymethyl) Phosphine Oxide (THPO)?

THPO is a phosphorus-containing organic compound (CAS 1067-12-5) primarily used as a reactive flame retardant. Its structure features three hydroxymethyl groups attached to a phosphine oxide core, enabling it to chemically bond with substrates for enhanced fire protection.

What are the main applications of THPO?

THPO is commonly used in flame-retardant textiles, coatings, polymers, adhesives, and wood treatments. It helps materials achieve high fire-resistance ratings while maintaining flexibility and durability.

Is THPO environmentally friendly?

Yes, THPO promotes sustainability by reducing reliance on halogen-based retardants. It generates less smoke and fewer toxic byproducts during combustion and is water-soluble for easy processing in eco-conscious formulations.

How should THPO be stored and handled?

Store in a dry, cool place in sealed containers to prevent moisture absorption. Handle with PPE to avoid skin or eye irritation, and ensure good ventilation during use.