Description

3,9-Bis(p-Nonylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane is a high-performance organophosphorus compound, specifically a cyclic phosphonate, valued for its exceptional stabilizing and flame-retardant properties. Its unique spirocyclic structure provides superior thermal and hydrolytic stability, making it a critical additive in demanding polymer applications. This product is essential for formulators and manufacturers in the plastics, coatings, and synthetic fiber industries seeking to enhance material durability and safety.

Application

• Primary Flame Retardant & Synergist in engineering thermoplastics such as polyamides (nylon), polyesters (PET, PBT), and polyolefins.
• Stabilizing Additive for synthetic fibers and textiles to improve resistance to thermal degradation during high-temperature processing.
• Polymer Processing Aid that enhances the thermal-oxidative stability of polymers, extending product lifespan.
• Component in Intumescent Flame-Retardant Systems for coatings, sealants, and construction materials.
• Additive for Adhesives and Specialty Coatings requiring improved fire resistance and thermal stability.
• Stabilizer in High-Temperature Lubricants and Greases to prevent degradation under severe operating conditions.

Basic Information

Product Name	3,9-Bis(p-Nonylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane
CAS No.	52664-24-1
Molecular Formula	C₃₅H₅₄O₆P₂
Molecular Weight	656.76 g/mol
Synonyms	Bis(p-nonylphenyl) Pentaerythritol Diphosphite; Pentaerythritol Bis(nonylphenyl) Diphosphite; Spirocyclic Pentaerythritol Diphosphite; 3,9-Dinonylphenoxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane; FR Pentaerythritol Diphosphite; Phosphite Stabilizer 52664-24-1; Antioxidant 626 (related trade); P-Phosphite Spiro Compound
EINECS	Contact for details

Quality Control

Our production of 3,9-Bis(p-Nonylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and performance. Certificates of Analysis (COA) documenting key specifications are provided with each shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and moisture to maintain product integrity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	95 - 105 °C
Volatile Matter	≤ 0.5%
Acidity (as H₃PO₄)	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.