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Construction materials

Construction materials for equipment coming in contact with food (including associated adhesives) must be food grade (FDA-approved or national equivalent). Selection of construction material depends upon the dry materials, method of cleaning and cleaning agents to be used.

Metals

Hygienic dry materials handling is best conducted with product contact surfaces of stainless steel. Suitable grades are SS 304, 304L (EN 1.4301/1.4306) and SS 316, 316L (EN 1.4401/1.4404). Aluminum and aluminum alloys (coated and non-coated) might also be used as dry material contact surfaces where only dry cleaning is applied.

Non-metals

Plastics (e.g Polycarbonate, PEEK, PVDF, PA and PTFE) and elastomers (e.g. NBR, Viton, Silicon, FEPsilicon) may be used, but contact should be limited where the dry material is abrasive. These materials must retain their original surface condition when exposed to the processing and cleaning conditions. Fabrics and non-metallic filter materials used in connection with the cleaning of air involved in dry materials handling systems must be non-toxic, cleanable, and not impart contaminating smell to the dry material. Nonmetallic surfaces can create electrostatic charges on the material, which can be problematic.

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