# The Materials and Articles in Contact with Food (Wales) Regulations 2012, Paragraph 3


Filling
(a) Samples which can be filled—
Fill the article with a 4 % (v/v) acetic acid solution to a level no more than 1 mm from the overflow point; the distance is measured from the upper rim of the sample. Samples with a flat or slightly sloping rim should be filled so that the distance between the surface of the liquid and the overflow point is no more than 6 mm measured along the sloping rim.
(b) Samples which cannot be filled—
The surface of the sample which is not intended to come into contact with foodstuffs is first covered with a suitable protective layer able to resist the action of the 4 % (v/v) acetic acid solution. The sample is then immersed in a recipient containing a known volume of acetic acid solution in such a way that the surface intended to come into contact with foodstuffs is completely covered by the test liquid.

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Source: https://www.legislation.gov.uk/wsi/2012/2705/schedule/3/paragraph/3 (the official version)
Page: https://openlegislation.uk/materials-and-articles-in-contact-with-food-wales-regulations-2012/schedule-3/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.