The surface coating is carried out typically with paint or enamel paint, namely a mixture of:
- water and aliphatic ammines;
- functional charges.
The functional features of such product intended to come into contact with food, guarantee the insulation from metal, the resistance of mechanical process, resistance to chemical attack, including with respect to the natural components or additives and to the inertia with respect the food.
However, additionally, the precursors included in paints shall satisfy the following:
The monomers needed for the synthesis of polymers (resins and crosslinkers) shall be present in the allowed components lists of the specific laws and regulations. These are:
- CE n.1895/2005 on the restriction of use of certain epoxy derivatives in materials and articles intended to come into contact with food, which defines the migration limits of some epoxy derivatives or material with plastic coating;
- Reg. UE 10/2011 on plastic materials and articles intended to come into contact with food;
- Reg. UE 2018/213 on the use of bisphenol A in varnishes and coatings intended to come into contact with food.
In addition to the specific product requirements necessary to guarantee the performance, the economic operators shall draft a declaration of conformity for MOCA certification according to Reg. 1935/2004 to guarantee the traceability of the products (including paints).
The declaration shall comply with the annex I of Reg. (UE) 2018/213 and in case is included an epoxy resin also compliance to Reg. CE 1895/2005 is required avoiding the use of bisphenol A (BPA).