Description

Irganox B 561 is a synergistic blend of primary and secondary antioxidants designed for superior polymer stabilization. This high-performance additive system is crucial for protecting plastics and synthetic materials from thermal and oxidative degradation during processing and long-term service. It is an essential solution for manufacturers in the plastics, rubber, and synthetic fiber industries seeking to extend product lifespan and maintain material integrity under demanding conditions.

Application

• Primary application as a stabilizer for polyolefins (PP, HDPE, LDPE) to prevent oxidation during extrusion and molding.
• Enhancing the long-term thermal stability of engineering plastics and thermoplastic elastomers (TPEs).
• Protection of synthetic fibers and filaments from degradation during high-temperature spinning processes.
• Stabilization of adhesives, sealants, and rubber compounds to prevent premature aging and loss of properties.
• Used in masterbatch production for consistent and efficient additive incorporation into polymer matrices.
• Formulation component for lubricants and greases requiring oxidation inhibition.

Basic Information

Product Name	Irganox B 561
CAS No.	89421-57-8
Molecular Formula	Blend (Contact for details)
Molecular Weight	Blend (Contact for details)
Synonyms	Irganox B561; Antioxidant Blend B 561; Phenolic-Phosphite Antioxidant Blend; Polymer Stabilizer B561; BASF Irganox B561; Antioxidant B 561; Blend of Irganox 1010 and Irgafos 168 (typical composition); Tris(2,4-di-tert-butylphenyl) phosphite blend with Pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate)
EINECS	Contact for details

Quality Control

Our Irganox B 561 is manufactured under strict quality management systems to ensure batch-to-batch consistency and performance reliability. The product undergoes rigorous analytical testing, including assay and component ratio verification, to meet precise specification limits. A Certificate of Analysis (COA) detailing all quality parameters is provided with each shipment 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 room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); keep the original container tightly sealed when not in use to minimize exposure to atmospheric humidity. Keep away from heat sources and incompatible materials.

Specification

Item	Specification
Appearance	White to off-white powder or granules
Identification (IR)	Conforms to standard
Assay (Active Components)	≥ 98.0 %
Component Ratio (Phenolic:Phosphite)	As per typical blend specification
Volatile Matter	≤ 0.5 %
Ash Content	≤ 0.1 %
Solubility	Soluble in typical organic solvents

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