Papír a lepenka určené pro styk s potravinami - Stanovení stálosti fluorescenčně běleného papíru a lepenky (Norma k přímému použití jako ČSN).
NORMA vydána dne 1.6.2019
Designation standards: ČSN EN 648
Classification mark: 500488
Catalog number: 507703
Publication date standards: 1.6.2019
The number of pages: 16
Approximate weight : 48 g (0.11 lbs)
Country: Czech technical standard
Kategorie: Technické normy ČSN
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 UV 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