Antioxidant 626

Product Overview

Antioxidant 626, chemically known as 3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, represents a class of high-efficiency hindered phosphite stabilizers. This specialized additive is engineered to provide exceptional protection against thermal degradation during the processing of various organic polymers. With a molecular formula of C33H50O6P2 and a molecular weight of 604.694, it offers a robust solution for manufacturers seeking to maintain polymer integrity under high-temperature conditions.

As a secondary antioxidant, it functions primarily by decomposing hydroperoxides formed during oxidation, thereby preventing chain scission and cross-linking reactions that compromise material quality. Its unique spiro-phosphite structure ensures superior hydrolytic stability compared to traditional phosphites, making it an ideal choice for demanding industrial applications where moisture resistance is critical.

Technical Specifications

Our manufacturing process adheres to strict quality control standards to ensure consistent performance across all batches. The following table outlines the key physical and chemical characteristics of Antioxidant 626:

Industrial Applications

This antioxidant is widely utilized across the polymer industry due to its versatility and effectiveness. It is particularly suitable for stabilizing polyolefins, elastomers, polycarbonate, polyester, and styrenic polymers. During extrusion or molding processes, Antioxidant 626 helps maintain excellent melt flow rates and prevents yellowing, ensuring the final product retains its aesthetic and mechanical properties.

For optimal performance, it is often used in synergistic combination with primary hindered phenol antioxidants, such as Antioxidant 1010 or 1076. This combination provides comprehensive protection against both processing-induced thermal oxidation and long-term thermal aging. Additionally, it can be formulated alongside benzotriazoles and HALS (Hindered Amine Light Stabilizers) to offer combined thermal and light stabilization for outdoor applications.

Handling And Storage

While Antioxidant 626 exhibits good stability, it is sensitive to moisture. Users should keep containers tightly closed and store the product in a cool, dry environment to prevent hydrolysis. Proper handling procedures should be followed in accordance with the Material Safety Data Sheet (MSDS). We offer bulk packaging options, typically 20kg cartons, to accommodate large-scale industrial production needs. Our commitment to quality ensures that every shipment includes a Certificate of Analysis (COA) for verification.