Van Merksteijn Staalcoating B.V. has an ongoing focus on all aspects related to quality control, including abrasive blasting quality specifications, oven temperature, coating thickness, the careful packaging and loading of steel components etc. Its long track record of protecting steel components in accordance with the most rigorous quality standards has enabled Van Merksteijn Staalcoating B.V. to grow and develop into a leading and innovative coating company.

The choice of the system to be used is crucial for the quality of the coating.

Factors that influence corrosion

  • Presence of pollutants in the atmosphere
  • Exposure to rain and sunshine
  • Micro-climate factors such as the presence of surface water, roofs of swimming pools, sun/shade    etc.
  • Direct contact with water or soil
  • Cold bridges in the steel structure
  • Exposure to chemicals as a result of petrochemical industries, pickling baths etc.
  • Exposure to mechanical loading factors such as erosion, sudden impacts etc.
  • Relative humidity or condensation (surface temperature at or below dew point)
  • Extreme temperatures e.g. in cooling/freezer pipes
  • Period during which the steel structure is subjected to additional corrosive influences, e.g. during installation/construction phase


Finishing activities

Finishing activities can be carried out on powder coating systems with the help of liquid paints. Suitable instructions for doing so are available for every powder coating system supplied by Van Merksteijn Staalcoating B.V.

System guarantee

Cooperation between the agency applying the coating and the manufacturer of the powder often makes it possible for Van Merksteijn Staalcoating B.V. to provide a guarantee for the complete system.

The powder coating systems used by Van Merksteijn staalcoating B.V. enable it to offer clients services that comply with very rigorous standards up to the C5-I standard. The table below lists the relevant standards.

Corrosive class

Example of outdoor application

Example of indoor application


Heated buildings with clean indoor environment, e.g. offices, shops, schools and hotels.


Atmosphere with a low level of contamination, rural and dry area with little air pollution.

Unheated buildings where condensation can occur e.g. storage locations and sports facilities.

C3 Urban and industrial environments with relatively little CO2 pollution.
Coastal areas with low salt concentrations.

Commercial environments with high relative humidity and limited air pollution, e.g. food processing businesses, laundry facilities, beer breweries and dairy companies.

C4 Coastal areas with moderate salt concentrations.

Chemical companies, swimming pools, harbours.

C5-I (industrieel)

Industrial areas with high relative humidity and a corrosive atmosphere.

Buildings or areas subjected to practically continuous condensation and high levels of pollution.

C5-M (maritiem)

Coastal areas and outlying areas with high salt concentrations.

Buildings or areas subjected to practically continuous condensation and high levels of pollution.