Description

3,9-Bis(2,4-Ditert-Butylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane is a high-performance organophosphite antioxidant and secondary phosphite stabilizer. It matters because it provides exceptional long-term thermal stability and color protection for polymers, preventing degradation during processing and end-use. This compound is essential for manufacturers in the plastics and polymer industries who require reliable protection for sensitive materials against oxidative and thermal stress.

Application

• Primary antioxidant and processing stabilizer for polyolefins (PP, HDPE, LDPE).
• Color stabilizer and melt flow protector in engineering plastics and thermoplastic elastomers.
• Synergistic component in stabilizer systems with primary phenolic antioxidants (e.g., Irganox 1010).
• Stabilizer for adhesives, sealants, and polymer resins to prevent yellowing and maintain mechanical properties.
• Protective additive in masterbatches and compounded polymers for enhanced weatherability.
• Used in the production of films, fibers, and molded articles requiring high clarity and color stability.

Basic Information

Item	Detail
Product Name	3,9-Bis(2,4-Ditert-Butylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane
CAS No.	87498-44-0
Molecular Formula	C35H56O6P2
Molecular Weight	658.77 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite; Pentaerythritol Bis(2,4-di-tert-butylphenyl) Phosphite; Ultranox 626; Irgafos 126; ADK STAB PEP-36; Phosphite Antioxidant 626; 3,9-Bis[2,4-bis(1,1-dimethylethyl)phenoxy]-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane
EINECS	Contact for details

Quality Control

Our production of 3,9-Bis(2,4-Ditert-Butylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing to ensure compliance with industry specifications for purity, performance, and consistency. Certificates of Analysis (COA) documenting key parameters such as assay, melting point, and solution color are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic and easily oxidized nature, the container must be kept tightly sealed after opening to minimize exposure to moisture and air. For long-term storage, consider using an inert atmosphere (e.g., nitrogen blanket).

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 180 °C
Solution Color (APHA)	≤ 50
Acidity (as H3PO4)	≤ 0.05 %
Loss on Drying	≤ 0.5 %

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