BS EN 646:2006 pdf free.Paper and board intended to come into contact with foodstuffs — Determination of colour fastness of dyed paper and board.
BS EN 646 This document describes procedures for the testing of dyed paper and board intended to come into contactwith foodstuffs.Two procedures are given. Procedure A for contact of long duration (e. g.food packaging) andprocedure B for contact of short duration (e. g. napkins, kitchen papers, household papers).
Visual evaluation against a blank is used only in order to detect any bleeding (yes/no) while evaluation againsta grey scale provides grading of the bleeding.
The following referenced documents are indispensable for the application of this document.For datedreferences，only the edition cited applies. For undated references，the latest edition of the referenceddocument (including any amendments) applies.
ISO 8787,Paper and board — Determination of capillary rise — Klemm method
For the purposes of this document, the following term and definition applies.
colour fastness lack of transfer of colour from a paper to a non stained glass-fibre paper，saturated with a test fuid andevaluated visually for staining against a grey scale or a blank.
A sample is brought into contact with glass fibre papers which have been saturated with a test fluid and placedunder load for a given time.The staining of the glass fibre paper is evaluated with the grey scale.The stainingof the glass fibre paper is evaluated against a blank or grey scale.The test fluids used are distilled ordeionised water, dilute acetic acid, saliva simulant and olive oil depending on the type of contact expected.
Dissolve the potassium and sodium salts in approx. 900 ml water. Then add the calcium chloride and magnesium chloride and stir until all added reagents have dissolved completely.Calibrate the pH meter with abuffer solution as stipulated by the manufacturer. Then immerse the pH electrode into the solution, stir brieflyand add hydrochloric acid until a constant pH of 6.8± 0.1 has been obtained.Transfer the solution to a 1000ml volumetric flask and fill to the mark with water.Store protected from light and make sure that the pH of thesimulated saliva is in the 6.8±0.1 range prior to use.BS EN 646 pdf download.