Food hygiene – Guideline for the selection of materials used in contact with foodstuffs – General principles
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2017

Food hygiene – Guideline for the selection of materials used in contact with foodstuffs – General principles
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2009