Corrosion resistance classes - CRC

CRC0

Very slight or no protection for components, with no corrosion stress such as

• small, visually irrelevant standard parts,

CRC1

Slight protection for components with low corrosion exposure such as

• transport and storage protection
• Parts that do not have primarily decorative surface requirements, e.g. in internal areas that are not visible or behind covers

CRC2

Medium protection for components with moderate corrosion stress such as

• externally visible parts with primarily decorative surface requirements
• Direct contact with a normal industrial environment or media such as coolants or lubricating agents

CRC3

Strong protection for components subject to high corrosion stress such as

• external, visible parts in direct contact with a normal industrial environment or media such as solvents and cleaning agents
• Primarily functional surface requirements
  

CRC4

Hard protection for components subject to particularly high corrosion stress such as

• parts exposed to aggressive media, e.g. in the food or chemical industry
• Outdoor exposure under extreme corrosive conditions

These applications should be supported with special tests with the media if required.