BS ISO 11949:2015 pdf free

BS ISO 11949:2015 pdf free.Cold-reduced tinmill products – Electrolytic tinplate
The surface of electrolytic tinplate is normally subjected to a passivation treatment and to oiling.Passivation, produced either by a chemical or an electrochemical treatment, gives a surface with an improved resistance to oxidation and improved suitability for lacquering and printing. The typical range of passivation is generally up to 10 mg/ m2 for each side. Unless otherwise agreed at the time of ordering, the usual passivation procedure is a cathodic treatment in an acidic chromate solution.
Under normal conditions of transport and storage, electrolytic tinplate shall be suitable for surface treatments such as established lacquering and printing operations.
Tinplate coils and sheets are supplied with an oil coating. The oil shall be one that is recognized (i.e. by the relevant national or international authority) as being suitable for food packaging. Unless otherwise agreed at the time of ordering, the kind of oil is at discretion of the manufacturer.
NOTE 1 For the oil, DOS (dioctyl sebacate) is usually used.
NOTE 2 For measuring chromium of passivation film, the diphenylcarbazide method or the X-ray flourescence spectrometric method is usually applied. When the X-ray method is applied, it is necessary to consider the influence of chromium in base metal.
The nominal coating mass, on each surface, shall be expressed in grams per square metre. The lowest value specified in this International Standard shall be 1,0 g/m2 on each surface, and no upper limit is specified. Values of preferred coating masses are 1,0 g/m2, 1,4 g/m2, 2,0 g/m2, 2,8 g/m2, 4,0 g/m2,5,0 g/m2, 5,6 g/m2, 8,4 g/m2 and 11,2 g/m2.
Whatever the coating mass used, the coating mass for sample average and for individual sample shall not be less than the minimum coating mass indicated in Table 2. The coating mass for sample average is the average of three measurements on each sheet selected. The mass per unit area for equally and differentially coated tinplate is determined on test pieces taken from samples selected in accordance with Clause 12 and tested in accordance with 13.1.BS ISO 11949 pdf free download.