BS EN 648:2018 pdf download.Paper and board intended to come into contact with foodstuffs – Determination of the fastness of fluorescent whitened paper and board.
This document describes procedures for the testing of the fastness of fluorescent whitened paper and board intended to come into contact with foodstuffs. Some procedures depending on the foreseeable use of the material are given.
Visual absence of the glass fibre paper’s fluorescence under tJV light is evaluated.
For samples having significant different sides, a migration can occur from one glass fibre to the other and could lead to wrong interpretation of the fastness of one side. It is advisable to check these samples using large sampling procedure to prevent cross contamination of the glass fibre during the migration procedure. The procedure is described in Annex A. If lower limit of detection is required, this procedure can also be used.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 186 Paper and board – Sampling to determine average quality (ISO 186)
EN ISO 3696, Water for analytical laboratory use – Specification and test methods (ISO 3696)
ISO 6588-2, Paper, board and puips – Determination of pH of aqueous extracts – Part 2: Hot extraction
4 Principle
A sample is brought into contact with glass fibre papers which have been saturated with a test fluid and
placed under load for a given time. The staining of the glass fibre paper is evaluated by comparison with
a series of fluorescent whitened comparison papers. The test fluids used are distilled or deionized water,
dilute acetic acid, alkaline salt solution and olive oil depending on the type of food contact expected.