BS 15384-1:2017 pdf download – Packaging — Test method to determine the porosity of the internal coating of flexible aluminium tubes Part 1 : Sodium chloride test 1 Scope This European Standard is applicable for internally coated cylindrical and conical aluminium tubes, mainly used for the packing of pharmaceutical, cosmetic, hygiene, food or other household products. The internal coating is used as a barrier and should avoid any contact between aluminium and the product. This standard defines the sodium chloride method to detect the electrolyte conductivity as one criterion for the quality of the internal coating. NOTE The electrolyte conductivity of the internal coating is only one criterion for evaluation of the quality of an internal coating. It does not give any information on the quantity or size of any pores or uncoated areas, nor any hint on possible reactions between the aluminium tube and the product. The electrolyte conductivity should never be used as the sole criterion for quality evaluation of the internal coating, but always with other parameters e.g. film thickness, acetone and/or ammonia resistance and of course results of enhanced stability studies. 2 Principle The electrolyte conductivity of internally coated aluminium tubes is tested by an enamel conductometer. The aluminium tubes are filled with an electrolyte solution up to a fixed level at its open end. One electrode is connected to the tube nozzle, the second electrode is dipped into the solution. A defined voltage is applied for a fixed time. The induced current is a measure for the quality (pores and/or film thickness) of the internal coating. 3 Apparatus 3.1 Enamel conductometer 3.2 Moveable electrode 3.3 Electrolyte NOTE A schematic diagram of the test equipment is given in Figure 1. 4 Procedure All parameters having a significant influence on the test results for sodium chloride methods are listed in Table 1. Depending on the method and the kind of apparatus (different apparatus are available) specific adjustments and calibrations may be necessary and should be done as described in the user manuals prior to use. To take a measurement put the tube into the adapter electrode, ensuring there is an electric circuit between the tube and electrode. Insert the dipping electrode centrally into the tube until it touches the tube shoulder, avoiding any contact between the tube wall / tube shoulder and the dipping electrode. Fill the tube with electrolyte up to 10 mm from the end...
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