DIN EN 648 pdf free download

DIN EN 648 pdf free download.Papier und Pappe vorgesehen fur den Kontakt mit Lebensmitteln.
2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 6588-2, Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction ISO 3696, Water for analytical laboratory use — Specification and test methods 3 Terms and definitions For the purposes of this document, the following term and definition applies. 3.1 fastness ineffective transfer of fluorescent whitening agent from paper, to a glass fibre paper saturated with a test fluid and evaluated visually under UV-light 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, alkaline salt solution and olive oil depending on the type of food contact expected.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 × 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 (5.4), the weight (5.6) and the alkaline salt solution (6.4) are stored for 1 h at testing temperature in a drying cupboard (5.8); fluorescent whitening agent (6.1) is boiled in kettle (5.9). The use of cotton gloves is sufficient. 9.2 Immerse two sheets of unstained glass fibre paper (5.1) in a test fluid (6.1, 6.2, 6.3 or 6.4). Remove the sheets after saturation and free the sheets from excess fluid by wiping on the rim of the container. 9.3 Place one sheet of unstained glass fibre paper with its smooth side upwards on the glass plate (5.4). Place the test piece (Clause 8) immediately on the unstained glass fibre paper. Cover it with the second saturated sheet of unstained glass fibre paper, so that the smooth side of the unstained glass fibre paper is in contact with the test piece again. Place a second glass plate (5.4) on top of the second unstained glass fibre paper and for procedures A and B 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 under the condition of Table 1 with protection against direct light penetration. 9.4 If test pieces of a grammage of > 140 g/m 2 are to be investigated, an appropriate even number of unstained glass fibre paper layers (5.1) is used so that the total of their grammages just exceeds the grammage of the test piece. 9.5 After the storage time open the assembly. Place the unstained glass fibre papers on 3 adjacent glass rods, Ø 8 mm to Ø 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. Unstained glass fibre papers saturated with olive oil are not dried. 10 Test Conditions Table 2 describes the test conditions of EN 648. Test conditions A also covers test conditions B and C and long-time duration of hot contact is covered by A and D. 11 Comparison papers 11.1 Solutions for comparison papers Prepare the following stock solution (1 000 mg/l). Dissolve 1 g of fluorescent whitening agent (6.1) in 800 ml distilled or deionised water (6.2) and make up to 1 l. Using this stock solution, prepare the following standard concentrations. DIN EN 648  pdf download.