Omnistab AN 1425

Omnistab AN 1425 is a high molecular weight, multifunctional phenolic primary antioxidant for processing and long-term thermal stabilization. It contains phosphorus and is highly efficient, non discoloring stabilizer for organic substrates. Offers protection against thermo-oxidative degradation and high resistance to extraction. Also, used as esterification catalyst for the preparation of rosin esters. It is compatible with polyolefins, polyesters, and crosslinked elastomers (e.g. NBR). It is recommended for applications requiring improved extraction resistance, low volatility, excellent color and color stability and superior gas-fading resistance. It can be used alone or in combinations with other Omnistab stabilizers and co-stabilizers. The recommended concentration is 0.05-0.25 %.

Product composition

  • CAS number(s): 65140-91-2
  • Chemical name(s): (1,1-Di-tert.-butyl)-4-hydroxyphenyl)methyl) ethylphosphonate
  • Molecular formula: 2(C17H28O4P)Ca
  • Molecular weight (g/mol): 695
  • EU (EG-No (EINECS/ELINCS)): 211-685-2


  • Melting point/range (ºC): 260
  • Volatiles (%): 0.50 max
  • Transmittance 425 nm (%): 80.00 min
  • Transmittance 500 nm (%): 85.00 min
  • Calcium (%): 5.50 - 5.90
  • Chloride (%): 0.30
  • Product form(s): Powder, Granular
  • Packaging option(s):


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