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- Practical Guide -
Page 102 of 153
from polymeric coatings on metal substrates, which are intended to come into contact with
foodstuffs and a test method for overall migration into aqueous simulants by article filling
from polymeric coatings on food and beverage cans and non-stick coatings.
NOTE Polymeric coatings on metal substrates are not yet included in the scope of any
European Union Directive. This prestandard has been prepared to assist in the development
of such a Directive.
Food simulants, test media and reagents
Aqueous food simulants
The aqueous food simulants shall be of the following quality:
- distilled water or water of equivalent quality, simulant A;
- 3 % acetic acid (w/v) in aqueous solution, simulant B;
For the purposes of this standard this means a solution prepared by diluting 30 g of acetic
acid with distilled water to a volume of 1 l;
- 10 % ethanol (v/v) in aqueous solution, simulant C.
For liquids or beverages with an ethanol content greater than 10 % (v/v) the test is carried out
with aqueous solutions of ethanol of a similar strength.
Each of the above food simulants shall give a non-volatile residue of less than 5 mg/l, when
evaporated to dryness and dried to constant weight at 105 C to 110 C.
For overall migration testing of a coating material which is applied to substrates which are
not resistant to acid, 3 % acetic acid is an unsuitable simulant because of the interfering
corrosion products. 10 % aqueous ethanol should be used instead, since intensive studies
have demonstrated that they provide sufficient information to evaluate coating materials for
the overall migration properties even under the condition of contact with acidic food. Only in
certain cases would it appear necessary to use 3 % acetic acid as simulant, e.g. for samples
containing inorganic constituents and testing specific migration of certain additive such as
pigments, siccatives, amines and similar. In these cases the finished product can be tested
with acetic acid only if the corrosion products do not interfere with the determination of the
particular specific migrant. Otherwise it is recommended either to apply the coating on to an
inert substrate prior to testing, or to test the unsupported film in the case of laminated metal.