Diphenyl 2-Ethylhexyl phosphite

Product Overview

Diphenyl 2-Ethylhexyl Phosphite, with the chemical formula C₂₀H₂₇O₃P and CAS Number 15647-08-2, is an organophosphorus compound renowned as a secondary antioxidant and heat stabilizer in polymer formulations, particularly for PVC and polyolefins. This colorless to pale yellow liquid offers excellent thermal stability up to 250°C and low volatility, effectively decomposing hydroperoxides to prevent chain-scission and discoloration during processing. With a purity ≥97%, it chelates metal ions to inhibit catalytic degradation, enhancing long-term color retention and mechanical integrity. Its branched alkyl chain provides hydrolytic resistance, making it suitable for high-humidity environments and food-contact applications without migration issues.

Applications

Polymer Stabilization

• PVC and Flexible Films: Dosed at 0.2-0.4 phr in calendered sheets and bottles to prevent yellowing and brittleness, ideal for packaging and medical tubing.
• Polyolefin Compounds: Auxiliary stabilizer at 0.1-0.3% in HDPE and PP pipes, enhancing resistance to copper-catalyzed degradation in wiring conduits.

Industrial Formulations

• Lubricants and Greases: Added at 0.5-1% as an anti-wear additive, reducing friction and oxidation in high-load bearings.
• Coatings and Adhesives: Improves weatherability in alkyd and epoxy systems, maintaining gloss and adhesion over extended exposure.

Why Choose Our Diphenyl 2-Ethylhexyl Phosphite?

Our Diphenyl 2-Ethylhexyl Phosphite is purified to acid value <0.30 and chroma <50, with trace phenol <0.1% for unmatched clarity and stability in sensitive resins. Users in PVC recycling note 25% improved color fastness and reduced additive usage. Available in technical and food-contact grades, packaged in 200kg drums or 1000kg IBCs, with bulk options for large-scale compounding and full REACH/FDA compliance.

Frequently Asked Questions (FAQs)

What is Diphenyl 2-Ethylhexyl Phosphite?

It is a phosphite ester with formula C₂₀H₂₇O₃P and CAS 15647-08-2, acting as a secondary antioxidant. It’s a low-volatility liquid that decomposes peroxides and chelates metals to stabilize polymers like PVC during processing.

How is Diphenyl 2-Ethylhexyl Phosphite used in PVC stabilization?

Incorporate at 0.3-0.5 phr alongside primary antioxidants during melt blending; it synergizes with Ca-Zn systems to suppress HCl evolution and maintain transparency in extruded profiles.

Is it safe for food-contact materials?

Yes, it’s approved under FDA 21 CFR 178.2010 for indirect additives up to 0.5% in PVC, with low migration and no extractables in aqueous, acidic, or fatty simulants.

What is the shelf life of Diphenyl 2-Ethylhexyl Phosphite?

Under nitrogen storage in cool, dark conditions (<25°C), it remains stable for 24-36 months, with no significant peroxide formation or viscosity change.

Can it be combined with other antioxidants?

It excels with alkylated phenols like Irganox 1010 at 1:1 ratios for full-spectrum protection but avoid high-sulfur co-additives to prevent phosphite hydrolysis.

Does it impact processing temperatures?

Its high thermal stability allows processing up to 220°C without decomposition, potentially reducing cycle times by 10-15% in twin-screw extruders.

What packaging options are available for it?

We supply 200kg steel drums, 1000kg HDPE IBCs, and 20MT isotanks, all nitrogen-purged for oxidation prevention and compliant with UN 3082 shipping.

For stabilization recipes, regulatory guidance, or volume pricing, our additives specialists are ready to assist.

Contact Us

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