Stainless steel is the default material for use in environments where corrosion resistance is a prerequisite. For internal use, 304-grade material is more than adequate. The widely available higher-grade 316 and 316L stainless materials do provide greater corrosion resist- ance than 304, but the additional cost is unlikely to be justified unless repeated exposure to chlorinated solutions and chlorides, such as seawater, is expected. The washdown requirements for equipment installed in areas where hygiene is a key driver place specific criteria on the design of the enclosure. Hammond's latest IP69/IP69K-rated enclosure is the HYJ Series, manufactured from 304-grade stainless steel. Initially available in five sizes, from 202 × 124 × 102 to 416 × 338 × 203mm, the family's design ensures that there are no areas where contaminants can gather.
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