The IP69K rating is for applications where high pressure and high temperature wash down is used to sanitize equipment. Improved version of SS boxes were introduced with double lip and double gasket to meet IP69K requirement.
Techno Module is a modern, patented modular construction system for building LV panel boards. TM is easy to assemble, easy to expand during and after construction, open to all breaker brands and will technically fulfill any requirement that you might have.
Mild steel boxes have a high finish and are very solid. They will represent and reflect the quality of the machinery of the OEM in a convincing manner. The boxes can be fitted out with a large variety of different inserts so you can custom build your enclosure to any need. See for instance the DB2 system that is easy to mount for your convenience.