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Optical brightener OB-1 C.I. 393 used for polyester Stable fiber in Pakistan

Pakistan is one of the leading countries of production and consumption of polyester staple fiber. Polyester staple fiber is actually polyester fiber (PET). Polyester staple fiber is the downstream product of PTA and ethylene glycol, and is the most widely used variety with the largest output in chemical fiber. The white polyester staple fiber can be produced by adding 0.02%-1% optical brightener OB-1 C.I. 393 CAS NO.1533-45-5 in the blending process, and the colored polyester staple fiber can be produced by adding right amount of color masterbatch to the colored polyester staple fiber.

  • Brand: Raytop
  • Appearance: Yellow Green Powder
  • Purity: 98.5%
  • Color shade: Blue
  • Finess: 400-800 mesh
  • Package: 10kg/25kg per fiber drum
  • Shelf Life: 2 years
  • Transport: by sea or by air
  • Molecular formula: C28H18N2O2
  • CAS: 1533-45-5
  • Color light: blue
  • Solubility: solvent solubility
  • Wavelength: 374nm
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TECHNICAL DATA SHEET of Optical Brightener OB-1


Product Name:Optical Brightener OB-1   

Chemical Name:2.2’-(4.4’-diphenol vinyl) dibenzoxazol

CAS No.:1533-45-5

C.I. No.393

Molecular Formula:C28H18N2O2

Molecular Weight:414 

Technical IndexAppearance:Yellowish/greenish powder

Molecular weight:414.4    Melting Point:356℃~360℃


Fineness:≧200 mesh

Volatile content:≦0.5%    

Ash content:≦0.5%

Uses of Optical Brightener OB-1:

Mainly be used in whitening of polyester and plastic, as well in

whitening of Nylon during polymerization. 

For whitening of polyester and nylon; also used in ABS, PS,PVC, HIPS, PA, PC, PP, PE,PET,EVA, PVC, etc. 


Optical Brightener OB-1 Rate of use : (per 1000kg of substrate)   

Polyester: 75-300g  EVA, PP, nylon: 75-200g

Package:25kg per fiber drum

For polyester stable fiber, we also suggest to add some pigment blue 15:1 or 15:3,if you want to know more detail formula, kindly pls contact with our technical team.

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