Description

3,9-Bis(2,4-Dicumylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane is a high-performance, sterically hindered organophosphite antioxidant widely recognized for its exceptional thermal and color stability. This compound is critical for protecting polymers and synthetic materials from oxidative degradation during high-temperature processing and long-term use. It is an essential additive for manufacturers in the plastics, synthetic fiber, and specialty resin industries seeking to enhance product durability and lifespan.

Application

• Polymer Stabilization: Primary antioxidant and processing stabilizer for polyolefins (PP, PE), polyesters (PET, PBT), and engineering plastics to prevent thermal-oxidative degradation.
• Synthetic Fiber Production: Used as a melt stabilizer in the spinning process of nylon and polyester fibers to maintain viscosity and prevent yellowing.
• Hot Melt Adhesives: Protects adhesive formulations from oxidative breakdown during application and extends shelf life.
• Elastomers and Rubber: Imparts aging resistance to synthetic rubbers and thermoplastic elastomers (TPEs).
• Lubricant and Fuel Additives: Serves as an antioxidant in high-performance lubricants, greases, and industrial fuels.
• Coating Resins: Enhances the stability of solvent-based and powder coating resins during curing and in final application.
• Masterbatch and Compound Production: A key component in additive masterbatches for consistent and efficient dispersion in polymer matrices.
• Recycled Plastics: Helps restore properties and stability to post-consumer and post-industrial recycled polymer streams.

Basic Information

Product Name	3,9-Bis(2,4-Dicumylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane
CAS No.	154862-43-8
Molecular Formula	C55H66O6P2
Molecular Weight	885.03 g/mol
Synonyms	Bis(2,4-dicumylphenyl) pentaerythritol diphosphite; Pentaerythritol Bis(2,4-dicumylphenyl) Diphosphite; Phosphite Antioxidant 626; Antioxidant 626; Ultranox 626; Doverphos S-686; ADK STAB PEP-36; Irgafos 126; Diphosphite Spiro Compound; 3,9-Diphosphaspiro[5.5]undecane derivative
EINECS	Contact for details

Quality Control

Our production of 3,9-Bis(2,4-Dicumylphenoxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane adheres to a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, performance, and consistency. Certificates of Analysis (COA) documenting key parameters such as assay, melting point, and solution color are provided and can be tailored to meet specific customer or regulatory requirements.

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 (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture. For long-term storage, consider using an inert atmosphere (e.g., nitrogen purge) to minimize potential oxidation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	75 - 95 °C
Solution Color (APHA)	≤ 50
Acidity (as H3PO4)	≤ 0.05 %
Loss on Drying	≤ 0.5 %
Phosphorus Content	6.8 - 7.2 %

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