EN 14392:2007 – Aluminium and aluminium alloys – Requirements for anodised products for use in contact with foodstuff
1 Scope
This European Standard specifies requirements for coloured or uncoloured anodic oxidation coatings on wrought and cast products in aluminium and aluminium alloys for use in contact with food.
These requirements cover the chemical composition of the bath, the sealing and the properties of the obtained anodic oxidation coatings. They do not cover dyestuffs and pigments but do cover the metallic deposits produced by electrolytic colouring.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 601, Aluminium and aluminium alloys — Castings — Chemical composition of castings for use in contact with foodstuff
EN 602, Aluminium and aluminium alloys — Wrought products — Chemical composition of semi products used for the fabrication of articles for use in contact with foodstuff
EN 10204, Metallic products — Types of inspection documents
EN 12258-1:1998, Aluminium and aluminium alloys — Terms and definitions — Part 1: General terms
EN 12373-1, Aluminium and aluminium alloys — Anodizing — Part 1: Method for specifying decorative and protective anodic oxidation coatings on aluminium
EN 12373-4, Aluminium and aluminium alloys — Anodizing — Part 4: Estimation of loss of absorptive power of anodic oxidation coatings after sealing by dye spot test with prior acid treatment
EN 12373-5, Aluminium and aluminium alloys — Anodizing — Part 5: Assessment of quality of sealed anodic oxidation coatings by measurement of admittance
EN 12373-7, Aluminium and aluminium alloys — Anodizing — Part 7: Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion in phosphoric acid/chromic acid solution with prior acid treatment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12258-1:1998 and the following
apply.
3.1
anodic oxidation coating
coating obtained by an electrolytic oxidation process, having protective, decorative or functional properties
3.2
sealing
treatment of anodic oxide coating to reduce porosity and the absorption capacity of the coating by hydrothermal processes carried out after anodising
3.3
order document
document or set of documents agreed between supplier and purchaser at the time of ordering
NOTE An order document can be an order of the purchaser confirmed by the supplier or a quotation of the supplier confirmed by the purchaser.
4 Ordering information
In addition to the information necessary for sufficient definition of the product and its properties as defined by EN 12373-1, order documents shall contain the following information:
a) the number of this European Standard;
b) any requirement on the periodicity of inspection certificates (see Clause 8).
5 Chemical composition of the aluminium or aluminium alloy
The chemical composition of the aluminium or aluminium alloys for use in contact with food, intended to be anodised, shall comply with the requirements of EN 601 or EN 602, as applicable.
6 Chemical composition of the anodization bath
The anodization of aluminium or aluminium alloy products intended to be in contact with foodstuff shall be carried out in a diluted aqueous solution of one or more of the following acids:
sulfuric acid;
sulfomaleic acid;
sulfosalicylic acid;
oxalic acid;
sulfophtalic acid;
phosphoric acid.
EN 14392:2007 – Aluminium and aluminium alloys – Requirements for anodised products for use in contact with foodstuff