Tris(Hydroxymethyl) Phosphine Oxide (THPO) CAS No.1067-12-5

Tris(Hydroxymethyl) Phosphine Oxide (THPO), CAS No. 1067-12-5, is an important phosphorus-containing organic compound widely used as an intermediate and functional additive in the chemical industry. With its hydroxymethyl and phosphine oxide groups, THPO offers unique reactivity and stability, making it suitable for diverse applications.

Chemical formula: O=P(CH2OH)3
Molecular weight: 400-500
Properties: Colorless or pale yellow liquid
CAS No: 1067-12-5
Packaging and storage: In 250kg drum, sealed in plastic drums. Store in cool, dry and well ventilated area.

Applications

Flame Retardants and Polymers

  • Polyurethane Foams: Incorporated at 10-20% loading during synthesis to achieve UL-94 V-0 ratings, ideal for furniture and automotive seating.
  • Textiles and Coatings: Applied via padding or spraying for cotton and synthetic fabrics, providing durable fire resistance in upholstery and apparel.
  • Epoxy Resins: Reactive diluent enhancing char yield and reducing smoke evolution in electronics and composites.

Chemical Synthesis

  • Intermediate for Phosphonates: Building block in the production of advanced flame retardants and agrochemicals through further derivatization.
  • Water Treatment Additives: Chelating agent for metal ions in formulations, improving stability in industrial cleaners.

Why Choose Our THPO?

Our Tris(Hydroxymethyl) Phosphine Oxide is produced with advanced purification to limit impurities like heavy metals (<10 ppm) and residual solvents, ensuring optimal reactivity and safety. Manufacturers report 25% better flame-out times in PU applications compared to blends. Supplied in 25kg drums, 200kg IBCs, or bulk tankers, with customizable viscosity for liquid formulations and certifications for REACH and RoHS compliance.

Frequently Asked Questions (FAQs)

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

Tris(Hydroxymethyl) Phosphine Oxide (THPO) is a phosphorus-based compound with formula (HOCH₂)₃P=O and CAS 1067-12-5, primarily used as a reactive flame retardant. It’s a water-soluble solid that integrates into materials to inhibit ignition and spread.

How is THPO applied in polyurethane production?

Blend THPO at 15-25% into the polyol component before isocyanate addition; it reacts via hydroxyl groups for permanent incorporation. Cure at 80-120°C for full efficacy, and test LOI values post-processing.

Is THPO environmentally friendly?

Yes, THPO is halogen-free and promotes char formation over toxic gas release, aligning with green chemistry principles. It’s biodegradable under aerobic conditions and has low bioaccumulation potential.

What is the shelf life of THPO?

In sealed, dry storage below 30°C, THPO remains stable for 12-18 months, with no significant oxidation or viscosity changes when protected from air exposure.

Can THPO be used with other flame retardants?

THPO synergizes with nitrogen-based expanders like melamine for enhanced intumescence, but avoid strong acids to prevent hydrolysis. Compatibility trials are advised for multi-component systems.

Does THPO affect material properties like flexibility?

At recommended loadings, THPO maintains elongation and tensile strength in polymers, with minimal plasticizing effect due to its rigid structure—ideal for rigid foams without brittleness.

What packaging options are available for THPO?

We provide 25kg HDPE drums for powders, 200L plastic IBCs for liquids, and 1000kg flexitanks, all nitrogen-flushed to prevent moisture ingress during transit.

For formulation guidance, safety assessments, or supply chain solutions, our technical team is available.

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