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the bags shall have at least three layers, which together correspond to at least 420 J/m2 TEA average;
the second layer shall be covered with a layer of polyethylene of at least 15 g/m2;
inside the paper layers, a polyethylene bag at least 0,08 mm thick shall be fused to the bottom;
bags shall conform to standard EN 770;
when filling, the powder should be well pressed down. Loose powder must on no account be allowed to penetrate between the various layers.