Norner provides additive purity analysis of antioxidants

Additive purity analysis

Norner additive team analyse the purity of several commercially available antioxidants. The results of AO1010 and P168 are described below.

PURITY of AO1010

  • AO1010 (CAS no. 6683-19-8) is produced in a 2-stage process. The main product is a tetra-ester, but AO1010 contains several substances as by-products. There is a high focus on polymer purity, both from polyolefin producers and within legislation.
  • EU’s food contact regulation, Regulation (EC) No 10/2011, refers to NIAS (non-intentionally added substances) and states that the main impurities of a substance should be considered and if necessary to be included in the specifications of a substance.
  • Norner has checked AO1010 from the global key suppliers.
  • We are able to give a “finger print” of AO1010 from the different suppliers. The benefit with Norner’s study is that all analysis has been done with the same instruments and the same operator per analytic method.
  • Norner’s study has shown that the main impurity substance "Metilox" varies from ca. 500 ppm to ca. 6.000 ppm. 

PURITY of P168

  • P168 (CAS no. 31570-04-4) is produced in a 1-stage process. The main by-product is 2,4-DTBP (2,4-di-tert. butyl phenol), the starting phenol to make P168 and the resulting phenol from a hydrolytic reaction of P168.  
  • Norner has checked P168 from the global key suppliers. Norner’s study has shown that the level of 2,4-DTBP varies from ca. 100 ppm to ca. 1.300 ppm. 
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