On some of the switches that are listed on the Digi-Key site you will see the feature “Process Sealed” listed.
E-Switch defines “Process Sealed” as a switch that is “sealed to meet the minimum requirements of IP-67.”
Based on the IEC 60529 standards document. IP67 means dust tight and protected against the effects of immersion from 15cm to 1m. However E-Switch also notes that due to variables encountered in the actual water-wash processes that IP-67 does not necessarily insure that water entry into your parts can not happen.
Selection of Process Sealed Switches
See Also: IP/Nema Ratings