Description

3,9-Bis[2-(2-Ethoxyethoxy)Ethoxy]-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane 3,9-Dioxide is a high-performance organophosphorus compound, specifically a phosphite-based spirocyclic stabilizer. This chemical is valued for its exceptional ability to act as a secondary antioxidant and processing stabilizer, effectively preventing polymer degradation during high-temperature manufacturing. It is a critical additive for manufacturers in the plastics, polymer, and specialty chemical industries seeking to enhance the longevity and color stability of their products.

Application

• Primary use as a secondary antioxidant and processing stabilizer in polyolefins (PP, PE) and engineering plastics.
• Synergistic component in stabilizer packages for PVC, polyurethanes, and other polymers to prevent thermal and oxidative degradation.
• Enhances color retention and prevents yellowing in polymers during extrusion and molding processes.
• Used in the formulation of adhesives, sealants, and synthetic fibers to improve thermal stability.
• Acts as a chelating agent and co-stabilizer in combination with primary antioxidants like hindered phenols.
• Potential application as an intermediate in the synthesis of other specialty phosphite stabilizers.

Basic Information

Product Name	3,9-Bis[2-(2-Ethoxyethoxy)Ethoxy]-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane 3,9-Dioxide
CAS No.	83898-68-4
Molecular Formula	C19H40O12P2
Molecular Weight	546.46 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (common trade name reference); Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Antioxidant 626; Irgafos 126; ADK STAB PEP-36; Ultranox 626; Phosphite stabilizer 626; 3,9-Bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (related structure)
EINECS	Contact for details

Quality Control

Our production of 3,9-Bis[2-(2-Ethoxyethoxy)Ethoxy]-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane 3,9-Dioxide adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, performance, and consistency. Certificates of Analysis (COA) documenting key parameters are provided to guarantee compliance with your technical requirements and support your own quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Melting Point	Contact for details
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %
Phosphorus Content	Contact for details

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