Omnistab UV 988

Omnistab UV 988  is a benzylidene-bis-malonate type UV absorber. It strongly absorbs in the high energy part of the UV spectrum (short wavelength). It is colorless and is suitable for polyesters as well as for highly transparent PC. The absorption maximum for our Omnistab UV 988 is at 320 nm with the molar extinction coefficient more than 37000 l/ Omnistab UV 988 is also suitable for engineering plastics such as polycarbonate and polyesters. It can also be used in PVC and styrenics.

Product composition

  • CAS number(s): 6337-43-5
  • Chemical name(s): Tetraethyl 2,2-(1,4-phenylenedimethylidyne)bismalonate
  • Molecular formula: C22H26O8
  • Molecular weight (g/mol): 418.437 g/mol
  • EU (EG-No (EINECS/ELINCS)): 228-726-5


  • Content (%): 99.00 min
  • Melting point/range (ºC): 137.00 - 139.00
  • Ash (%): 0.10 max
  • Volatiles (%): 0.50 max
  • Transmittance 425 nm (%): 96.00 min
  • Transmittance 500 nm (%): 98.00 min
  • Product form(s): Crystal powder, Powder
  • Packaging option(s): Carton


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.

Visit Deltachem