Corrosion resistance class CRC
What does CRC actually mean?
CRC stands for corrosion resistance class
- CRC0: very low protection or none at all
No corrosion stress. Applies to small, optically irrelevant standard parts such as threaded pins, circlips and clamping sleeves which are usually only available on the
market in a phosphated or burnished version (and possibly oiled) as well as to ball bearings (for components < CRC 3) and plain bearings.
- CRC1: slight protection
Low corrosion stress. Dry internal use or transport and storage protection. Also applies to parts behind covers in non-visible interior areas, and parts which are covered
in the application (e.g. drive trunnions).
- CRC2: moderate protection
Moderate corrosion stress. Internal application in which condensation can occur. External visible parts with primarily decorative requirements for the surface and which
are in direct contact with the ambient atmosphere typical for industrial applications.
- CRC3: high protection
High corrosion stress. Outdoor exposure under moderate corrosive conditions. External visible parts in direct contact with the ambient atmosphere typical for
industrial applications or media such as solvents and cleaning agents, with primarily functional requirements for the surface.
- CRC4: extreme protection. Particularly high corrosion stress. Outdoor exposure under extreme corrosive conditions. Parts exposed to aggressive media, for instance in the chemical or food industries. Such applications may need to be safeguarded by means of special testing (see also FN940082) using appropriate media.