Omnistab AN 168

Omnistab AN 168 is a hydrolytically stable phosphite processing stabilizer. Also acts as an antioxidant. It has low volatility and is particularly resistant to hydrolysis. Provides storage stability and give the polymer long term protection against thermo-oxidative degradation. It protects polymers which are prone to oxidation, during the processing steps (compounding/pelletizing and recycling) from molecular weight change (by chain scission or crosslinking) and prevents discoloration. Omnistab AN 168 is compatible with polyesters, styrene homo- and copolymers, polyolefins, olefin-copolymers such as (HDPE, LLDPE), polypropylene, polybutene and ethylenevinylacetate copolymers as well as polycarbonates, polyamides and elastomers such as BR, SEBS, SBS, and other organic substrates.

Product composition

  • CAS number(s): 31570-04-4
  • Chemical name(s): Tris(2,4-ditert-butylphenyl) phosphite
  • Molecular formula: C42H63O3P
  • Molecular weight (g/mol): 646.93 g/mol
  • EU (EG-No (EINECS/ELINCS)): 250-709-6


  • Content (%): 99.00 min
  • Volatiles (%): 0.30 max
  • Melting point/range (ºC): 183.00 - 187.00
  • Transmittance 425 nm (%): 97.00 min
  • Transmittance 500 nm (%): 98.00 min
  • Acid value (mg KOH/g): 0.50 max
  • Hydrolytic resistance (90˚C water, 14h): Regular
  • Free 2,4-Di-tert-butylphenol: 0.30 max
  • Product form(s): Powder, Fine powder, Granular
  • Packaging option(s): Carton, Can


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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