BS EN 646:2018 pdf free

BS EN 646:2018 pdf free.Paper and board intended to come into contact with foodstuffs – Determination of colour fastness of dyed paper and board.
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3.1 colour fastness
lack of transfer of colour from a paper to a non-stained glass-fibre paper. saturated with a test fluid and evaluated visually for staining against a grey scale
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 and temperature. The staining of the glass fibre paper is evaluated against a grey scale. The test fluids used are distilled or deionized water, diluted acetic acid, alkaline salt solution and olive oil depending on the type of contact expected.
5 Materials and equipment
5.1 Unstained glass fibre papers’) of 60 mm x 90 mm. The glass fibre papers shall meet the following conditions:
a) grammage 70 g/m2
b) pH-value 9,0 to 9,5, measured in the hot water extract according to ISO 6588-2:
c) free from fluorescent whitened and wet strength agents;
d) free from cellulosic fibres.
5.2 Glass plates, 60 mm x 90 mm.
5.3 Polyethylene film, uncoloured and transparent.
5.4 Mass, 1 kg.
5.5 Grey scale in accordance with EN 20105-A03.
5.6 Drying cupboard.
5.7 Kettle.
6 Reagents
6.1 Distilled or deionized water, purity in accordance to EN ISO 3696, grade 3.
6.2 Aqueous acetic acid, 3.0 % (m/v).
6.3 Alkaline salt solution, see Table 1. composition of the alkaline salt with a pH of 8,6 ± 0,1.
6.4 Vegetable oil, that should be as defined in Commission Regulation (EU) No 10/2011.
7 Sampling
If a lot is tested then sampling is carried out in accordance with EN ISO 186.
8 Preparation of sample
Cut or punch several test pieces of 50 mm x 20 mm from the sample under investigation. Smooth edges shall be obtained.
9 Procedure
9.1 In case of test conditions D, the glass plates (5.2), the mass (5.4) and the vegetable oil (6.4) are stored for 1 h at testing temperature in a drying cupboard (5.6); distilled or deionized water (6.1) is boiled in kettle (5.7]. The use of cotton gloves is sufficient.BS EN 646 pdf free download.