Antioxidant 565
CAS 991-84-4
EC 213-590-1
Formula C33H56N4OS2
MW 588.95 g/mol
UV Absorbers & Stabilizers Plastics & PolymersPrinting & PackagingCoatings, Adhesives, Sealants & ElastomersAutomotive UV Protection & StabilizationAntioxidant & Stabilizer
Description
Antioxidant 565, also known by trade names Irganox 565 and UVA-AO, is a hindered phenolic antioxidant combined with a thioether component, registered under CAS 991-84-4 and EC 213-590-1. It carries no assigned E-code and is classified under HS code 2933.69.6050.
In polyolefin and engineering plastic formulations, Antioxidant 565 interrupts oxidative chain reactions by scavenging free radicals generated during thermal processing and UV exposure, extending service life of the finished part. It is also used in automotive coatings and adhesive systems where combined antioxidant and UV stabilization is required within a single additive.
Antioxidant 565 is supplied as a solid and is subject to REACH registration requirements for import and use within the European Economic Area. Procurement teams should confirm grade specifications and packaging formats directly with the supplier, as these vary by production batch and regional distribution agreements.
In polyolefin and engineering plastic formulations, Antioxidant 565 interrupts oxidative chain reactions by scavenging free radicals generated during thermal processing and UV exposure, extending service life of the finished part. It is also used in automotive coatings and adhesive systems where combined antioxidant and UV stabilization is required within a single additive.
Antioxidant 565 is supplied as a solid and is subject to REACH registration requirements for import and use within the European Economic Area. Procurement teams should confirm grade specifications and packaging formats directly with the supplier, as these vary by production batch and regional distribution agreements.
Physical Properties
| Melting Point | 92-95 °C |
| Boiling Point | 670.7±65.0 °C(Predicted) |
| Density | 1.07±0.1 g/cm3(Predicted) |
| Color | White to Off-White |
| Form | Solid |
| Log P | 13.2 at 25℃ |
Trade & Regulatory
| HS Code | 2933.69.6050 |
Other Names
UVA-AOIrganox 565IRGANDX565DDIrganox RA 565antioxidant AN 565Antioxidant Sunoxy 565ANTIOXIDANT TRUELICHT AN5652,4-Bis(octylthio)-6-(4-hydroxy-3,5-di-tert-butyla
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