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Irganox® B 501 W

Technical Datasheet | Supplied by BASF
Irganox® B 501 W by BASF is a synergistic mixture of phenolic antioxidant with phosphite. It contains 1:1:2-combination of calcium-bis(((3,5-bis(tert-butyl)-4-hydroxyphenyl) methyl)-ethylphosphonate), polyethylene-wax and tris(2,4-di-tert-butylphenyl) phosphite. It is a blend of Irganox® 1425 WL and Irganox® 168. It is highly effective against thermo-oxidative degradation. Offers good processing stability and gas fading resistance. Provides superior long-term thermal performance. Irganox® B 501 W is used for polypropylene fibers. Its recommended addition level is 0.15-0.25%.
Product Type
Antioxidants > Blends
Chemical Composition
1:1:2-Combination of calcium-bis (((3,5-bis(tert-butyl)-4-hydroxyphenyl) methyl)-ethylphosphonate); polyethylene-wax and tris(2,4-di-tert-butylphenyl) phosphite
Physical Form
Product Status
Applications/ Recommended for
  • PP
  • Fibers/ Textiles/ Carpets > Fibers
Food contact approval
Labels/Agency Rating
Australia, Canada, China, EU, Japan, Korea, Philippines, USA

Irganox® B 501 W Properties


Value & Unit
Test Condition
Test Method
Melting Point
50 - 300 °C
Flash Point
> 150 °C
Bulk Density
420 - 460 g/l

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