To help characterize the level of tightness of a product, an international standard has been defined. This standard defines several levels (from 0 to 9) to which resistance levels correspond to solid or liquid elements.
This standardization is expressed in the form of an IPXY coding where X corresponds to the level of protection against solid bodies and Y against water.
For example: IP67
When the protection against solid bodies is not specified, one can also find a type IPX5 codification
0 No protection
1 protection against solid foreign objects (diameter from 50 mm)
2 protection against solid foreign objects (diameter from 12.5 mm)
3 protection against solid foreign objects (diameter from 2.5 mm)
4 protection against solid foreign objects (diameter from 1.0 mm)
5 dust protection
6 hermetic to dust