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Optical Brightner

Optical Brightner (OBA) or Fluorescent Whitening Agents (FWA) is added to many substrates to reduce yellowing, improve whiteness and enhance the brightness of the product. Optical whiteners function by absorbing ultraviolet radiation and re-emitting blue light. The emitted blue light will reduce the yellow color of the substrate and impart a pleasing whiter-than-white appearance. Optical brighteners give more intensity to some colors as well.

Types of Optical Brightner:

  • Disulfonic / Divalent
  • Tetrasulfonic / Tetravalent
  • Hexasulfonic / Hexavalent

Advantages:

  • Brilliant, bluish whitening effects
  • Good light fastness
  • Excellent resistance to heat
  • Improved initial color
  • Increased brilliancy of colored and black pigments

Application:

  • Injection molded plastics
  • Film and Sheet
  • Fibers