Diphenyl Isodecyl Phosphite – CAS No. 26544-23-0

Product Overview

Diphenyl Isodecyl Phosphite, with the chemical formula (C₆H₅O)₂PO(C₁₀H₂₁) and CAS Number 26544-23-0, is a high-performance organophosphite ester designed as a secondary antioxidant, heat stabilizer, and metal deactivator for polymer resins and synthetic rubbers.

Applications

Polymer Processing and Stabilization

• PVC Resins: Dosed at 0.25-1.0 phr in rigid and flexible PVC for profiles, films, and bottles, preventing thermal degradation and maintaining clarity during calendering or extrusion.
• Polyolefin Compounds: Incorporated at 0.1-0.5% in HDPE, LLDPE, and PP masterbatches to enhance color stability and reduce melt fracture in blown films and injection molding.

Rubber and Elastomers

• Synthetic Rubbers: Stabilizer at 0.3-0.8 phr in SBR and EPDM formulations for tires and seals, improving aging resistance and surface finish.
• Wire and Cable Insulation: Protects crosslinked polyethylene against copper-induced oxidation, ensuring long-term electrical performance.

Other Industrial Uses

• Lubricants and Greases: Anti-oxidant additive at 0.5-2.0% to extend fluid life in hydraulic systems and engine oils.
• Adhesives and Sealants: Enhances shelf stability in polyurethane and silicone sealants by chelating metal contaminants.

Why Choose Our Diphenyl Isodecyl Phosphite?

Ours is refined to acid number <0.03 mg KOH/g and APHA color <30, with undetectable free phenol (<0.05%) for superior performance and minimal processing residues. Polymer extruders achieve 20% better color hold and reduced downtime from plate-out. Available in technical and food-grade variants, packaged in 200kg drums, 1000kg IBCs, or bulk tankers, with customizable viscosity and full compliance with REACH, TSCA, and EU 10/2011 standards.

Frequently Asked Questions (FAQs)

What is Diphenyl Isodecyl Phosphite?

It is an alkyl diaryl phosphite with formula (C₆H₅O)₂PO(C₁₀H₂₁) and CAS 26544-23-0, used as a secondary antioxidant. It’s a clear liquid that stabilizes polymers by decomposing peroxides and chelating metals during heat processing.

How is Diphenyl Isodecyl Phosphite applied in PVC compounding?

Add at 0.3-0.6 phr during dry blending with organotin or Ca-Zn stabilizers; it activates at melt temperatures above 180°C to prevent HCl release and maintain transparency in profiles and sheets.

Is Diphenyl Isodecyl Phosphite suitable for food-contact applications?

Yes, it’s listed in FDA 21 CFR 178.2010 for use up to 1.0% in PVC articles, with low migration potential and no detectable extractables in food simulants.

What is the shelf life of Diphenyl Isodecyl Phosphite?

In nitrogen-sealed containers stored cool and dry (<30°C), it retains full activity for 24-36 months, resistant to hydrolysis and oxidation under ambient conditions.

Can Diphenyl Isodecyl Phosphite be used with phenolic antioxidants?

It synergizes optimally with Irgafos 1010 or Songnox 1010 at 1:2 ratios for balanced peroxide control, but test for compatibility in high-shear extruders to avoid phase separation.

Does it influence melt viscosity?

At typical loadings, it has negligible impact on viscosity, actually improving flow by 5-10% through metal deactivation, beneficial for thin-wall molding.

What packaging options are available for it?

Options include 200kg steel drums, 1000kg plastic IBCs, and 22MT bulk isotanks, all inert-gas protected and certified for hazardous goods transport under UN 3082.

For compounding guidelines, stability testing, or supply chain solutions, our additives team is equipped to support.

Contact Us

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