Products are supplied with the following surface treatment features: Die-cast aluminium alloy cases for gears. Die-cast materials undergo the following surface cleaning operations: - De-burring by means of a mechanically operated shearing system - Accurate shot-peening - Painting - Washing and passivation Grey-coloured cast-iron cases for gears: - Die-cast materials are always painted Painting on reduction units ( if required) meets the following specifications: Description - Polyester resin based heat-hardening powders, altered with epoxy resins. Mechanical properties - Tests carried out onto degreased Unichim white lattens ( film thickness: 60 microns) comply with the following specifications: adherence ( ISO2409) , Erichsen drawing ( ISO152) , inverted shock ( DIN53158) , cone-shaped mandrel ( DIN53151) , hardness ( ASTM D3363/ 74) . Heat resistance - 24 HOURS AT 150¡ C. Corrosion strength - ASTM B 117/ 97 salt fog from 100 to 500 hours depending on the support s preliminary treatment.