BS EN 648-2006 pdf download.Paper and board intended to come into contact with foodstuffs — Determination of the fastness of fluorescent whitened paper and board.
This BS EN 648 specifies procedures for the testing of the fastness of fluorescent whitened paper and board intended to come into contact with foodstuffs. Two procedures are given, procedure A for contact of long duration (e. g. food packaging) and procedure B, for contact of short duration (e. g. napkins, kitchen papers. household papers).
2 Normative references
The following referenced documents are indispensable for the application 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 186.2002) ISO 8787. Paper and board — Determination of capillary rise — Klemm method
3 Terms and definitions
For the purposes of this document, the following term and definition applies.
fastness
ineffective transfer of fluorescent whitening agent from paper, to a glass fibre paper saturated with a test fluid and evaluated visually under UV-Iight against a series of comparison papers
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 deionised water, dilute acetic acid, saliva simulant and olive oil depending on the type of food 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 of 70 gim2
b) capillary rise of 190 mm to 210 mm in 10 mm in accordance with ISO 8787;
7 Sampling
Sampling shall be 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 A (long duration contact)
9.1 Immerse two sheets of glass fibre paper (5.1) in a test fluid (6.2, 6.3, 6.4 or 6.5). Remove the sheets after saturation and free the sheets from excess fluid by wiping them on the rim of the container.
9.2 Place one sheet of glass fibre paper with its smooth side upwards on the glass plate (5.4). Place the test piece (8) immediately on top and cover it with the second saturated sheet of glass fibre paper so that the smooth side of the glass fibre paper is In contact with the test piece again. Place a second glass plate (5.4) on top, wrap the total assembly in polyethylene film (5.5) to prevent the edges from drying out, load it with a mass of 1 kg (5.6) and allow it to stand for 24 h at (23 ± 2)° C with protection against direct light penetration.
9.3 If test pieces of a grammage > 140 gim2 are to be investigated, an appropriate even number of glass fibre paper layers (5.1) is used so that the total of their grammages just exceeds the grammage of the test piece.
Construct the assembly as described in 9.2, with each glass fibre paper being individually saturated and wiped and arranged in such a way that the same number of glass fibre papers are in contact with both sides of the test piece.
9.4 After 24 h open the assembly. Place the glass fibre papers on 3 adjacent glass rods, 0 8 mm to
0 10 mm, with the side which was in contact with the test piece upwards, cover them without contact to
prevent light penetration and air-dry at ambient temperature. Glass fibre papers saturated with olive oil are not
dried.
10 Procedure B (short time contact)
10.1 Immerse two sheets of unstained glass fibre papers (5.1) in a test fluid (6.2, 6.3, 6.4 or 6.5). Remove the sheets after saturation and free the sheets from excess fluid by wiping them on the rim of the container.
10.2 Place one sheet of unstained glass fibre paper with its smooth side upwards on the glass plate (5.4).BS EN 648-2006 pdf download.