# The Plastic Materials and Articles in Contact with Food Regulations 1998, Paragraph 4


Where, in the Table to this Part of this Schedule, the letter “a” is shown in brackets after the “X”, only one of the two simulants specified shall be used in the migration test, that is to say—
(a) if the pH value of the food is higher than 4.5, simulant A shall be used,
(b) if the pH value of the foodstuff is 4.5 or less, simulant B shall be used.

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Source: https://www.legislation.gov.uk/uksi/1998/1376/schedule/4/part/IV/paragraph/4 (the official version)
Page: https://openlegislation.uk/plastic-materials-and-articles-in-contact-with-food-regulations-1998/schedule-4/part-IV/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.