Omnistab OB

About Omnistab OB

It is a high molecular weight optical brightener / fluorescent whitening agent of the thiophenediyl benzoxazole class. It presents blue light in all the polymers of use.

  • CAS number: 7128-64-5
  • Chemical name: 2,5-thiophenediylbis(5-tert-butyl-1,3-benzoxazole)
  • Moleculair formula: C26H26N2O2S
  • Molecular weight (g/mol): 430.56
  • Content (%): 99.00 min
  • Melting point/range (ºC): 196 - 205
  • Transmittance 450 nm (%): 97.00 min
  • Transmittance 500 nm (%): 98.00 min
  • Ash (%): 0.30 max
  • Volatiles (%): 0.50 max
  • Product form(s): Crystalline powder, Powder
  • Packaging option(s): Carton
Product Data Sheet
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Product Data Sheet

Omnistab OB


Date: Friday, Sep 17, 2021

Product Composition

CAS number: 7128-64-5
Chemical name: 2,5-thiophenediylbis(5-tert-butyl-1,3-benzoxazole)
Moleculair formula: C26H26N2O2S
Molecular weight (g/mol): 430.56

Product Specification

Content (%) 99.00 min
Melting point/range (ºC) 196 - 205
Transmittance 450 nm (%) 97.00 min
Transmittance 500 nm (%) 98.00 min
Ash (%) 0.30 max
Volatiles (%) 0.50 max
Product form(s): Crystalline powder, Powder
Packaging option(s) Carton
REACH compliance
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Regulation EC N˚ 1907/2006

Omnistab OB


Date: Friday, Sep 17, 2021

According to Regulation (EC) N˚ 1907/2006 of the European Parliament and of the Council of 18 December 2006 concerning the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH), all chemical substances on their own, contained in preparations, or in articles, manufactured, imported or used, should comply with the requirements of REACH.

In its role as importer and downstream user Partners in Chemicals has taken its responsibility to continuously consult with its suppliers outside the European Union (EU) about the responsibilities and requirements of REACH and will continue to do so.

In this light, we can inform you that the product that Partners in Chemicals currently supplies to you, Omnistab OB, is a product that is registered with the European Chemicals Agency (ECHA) in compliance with the tonnage band of 10-100mt. The registration number: 01-2120089692-44-0007.

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