Omnistab OB CBS 351 (CBS-X)

Disodium-2,2′-([1,1′-biphenyl]-4,4′-diyldivinylene)bis(benzenesulphonate). Acts as an optical brightener. Omnistab OB CBS 351 (CBS-X) functions by absorbing invisible ultraviolet radiation and re-emitting it as visible light in the blue range of the spectrum. Used to mask the yellowish cast sometimes observed in plastics and fibers after high temperature processing operations.

Product composition

  • CAS number(s): 27344-41-8
  • Chemical name(s): Disodium-2,2'-([1,1'-biphenyl]-4,4'-diyldivinylene)bis(benzenesulphonate)
  • Molecular formula: C28H20Na2O6S2
  • Molecular weight (g/mol): 562.56
  • EU (EG-No (EINECS/ELINCS)): 248-421-0


  • Water (%): 5.00 max
  • Water insolubility (%): 0.50 max
  • 1% Extinction value: 1125 min
  • Product form(s): Crystal powder, Powder, Fine powder, Granular
  • Packaging option(s): Carton, Drum, Fiber drum, Bag


In 2007 we decided to start ICG Specialty Chemicals selling specialty chemicals and additives under the tradename Omnistab.



Partners in Chemicals expanded its business in Middle East by setting up a branch office in Dubai in 2014.

Our Dubai office gives direct access to the Middle East and Africa. Having warehousing facility in the Dubai Free Zone makes it much easier to import, stock and re-export material to different destinations around the globe.




To serve the American market we have set up our Chicago branch office in 2009.



Deltachem (Qingdao) Co. Ltd. has been established in 2012 but general manager Mr. Mike Zou is already since 2007 a business partner for the Omnistab range.

Deltachem is the partner of Choice for Partners in Chemicals.

Besides being responsible for sourcing new products, supplychain and quality controle Deltachem is also managing the production facilities and handles the technical support.

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