BS ISO 6656:2002,Animal and vegetable fats and oils — Determination of polyethylene-type polymers.BS ISO 6656:2002 pdf free download.
The presence of polyethene-type polymers, which originate from packaging materials, can cause serious difficulties in the processing of fats, as they can lead to deposits and blockages in pipes, valves, etc. In the manufacturer of soap, they may lead to the appearance of fibre marbling and undesirable specks.
3 Principle
After acid treatment to decompose any soaps present, a test portion is dissolved in chloroform(which leaves polyethyene-type polymers in suspension) and filtered through a sintered filter crucible containing a mat of filter aid. The crucible and its contents are washed, dried and weighed. Polyethylene-type polymers are extracted from the insoluble matter by boiling tetrachloroethylene. The crucible with its contents are dried and weighed again.
BS ISO 6656:2002 specifies the reference method for the determination of polyethylene-type polymers in animal and vegetable fats and oils.
BS ISO 6656:2002 has been established that below 50 mg of polymers per kilogram the precision of the method is insufficient .
This method is used for animal fats and oils in particular.

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