Description

3,9-Bis(Isotridecyloxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane is a high-performance organophosphorus compound, specifically a spirocyclic phosphite, valued for its exceptional effectiveness as a secondary antioxidant and processing stabilizer. Its primary function is to prevent polymer degradation by decomposing hydroperoxides, thereby significantly enhancing the thermal stability and longevity of finished products. This chemical is essential for manufacturers in the plastics, synthetic fiber, and elastomer industries seeking to protect their materials from oxidative and thermal stress during high-temperature processing and end-use.

Application

• Polymer Stabilization: Acts as a highly efficient secondary antioxidant (hydroperoxide decomposer) in polyolefins (PP, PE), engineering plastics, and synthetic rubbers to prevent thermal and oxidative degradation during extrusion, injection molding, and other processing steps.
• Synergistic Formulations: Used in combination with primary antioxidants (e.g., hindered phenols) to create synergistic stabilization systems, offering superior long-term thermal stability (LTTS) for demanding applications.
• Fiber Production: Protects polypropylene (PP) and polyester fibers from molecular weight loss and yellowing during high-speed melt spinning and drawing processes, maintaining fiber strength and color.
• Adhesives and Sealants: Enhances the heat resistance and shelf-life of hot-melt adhesives, polyurethane systems, and other polymer-based sealants.
• Lubricant and Fuel Additives: Serves as an antioxidant additive in synthetic lubricants, greases, and industrial fuels to inhibit oxidation and sludge formation.
• Elastomer Processing: Improves the scorch safety and aging resistance of synthetic rubbers like EPDM and SBR during vulcanization and in final products such as automotive seals and hoses.

Basic Information

Item	Details
Product Name	3,9-Bis(Isotridecyloxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane
CAS No.	69439-68-5
Molecular Formula	C29H60O6P2
Molecular Weight	590.73 g/mol
Synonyms	Bis(isotridecyl) Pentaerythritol Diphosphite; Pentaerythritol Bis(isotridecyl) Diphosphite; Spirocyclic Phosphite Antioxidant; Phosphite Stabilizer 69439-68-5; Isotridecyl Pentaerythritol Diphosphite; 3,9-Diisotridecyloxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane; Hostanox® PAR 24 (Trade Name); Doverphos® S-686 (Trade Name)
EINECS	Contact for details

Quality Control

Our production of 3,9-Bis(Isotridecyloxy)-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane adheres to a stringent quality management system to ensure batch-to-batch consistency and high performance. Each lot undergoes comprehensive analytical testing, including assay by titration, color (APHA), and acidity control, to meet exacting customer specifications. Certificates of Analysis (COA) documenting all critical parameters are provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is easily oxidized; for long-term storage, maintaining an inert atmosphere (nitrogen blanket) in the container headspace is recommended to preserve efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (Titration)	≥ 95.0 %
Color (APHA)	≤ 50
Acidity (as H3PO4)	≤ 0.05 %
Refractive Index (n20D)	1.465 - 1.475
Density (20°C)	0.950 - 0.980 g/cm³

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