NOT - Bygg og anlegg


The NOT-processes® constitute a Duplex system that consists of one or more surface treatments applied to hot-dip galvanised steel. This elevates carbon steel to the highest corrosion class and opens the door to a wide range of colour combinations and high finishes. Norsk Overflate Teknikk AS provides two different processes.

NOT - Duplex
NOT - Duplex
NOT - Duplex

Steel in highly corrosive environments:
Steel designed for use in highly corrosive environments requires extra protection on account of the high demands made on its service life. This may be relevant for special offshore structures, bridge elements, aquaculture equipment, jetties and roads. Some structures and buildings are constructed in locations where future maintenance is difficult to perform. In such cases, it is essential to apply optimal corrosion protection of the type the NOT-processes® provide.

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Service life
As a Duplex system, the NOT-processes® have a much longer service life than the individual coatings themselves.

Formula for estimated service life


The NOT-processes® are executed in accordance with the following standards:

  • Hot-dip galvanisation in accordance with NS-EN ISO 1461
  • Powder coating in accordance with NS-EN 13438
  • Coating and painting in accordance with Norwegian Standard M-501
  • Surface treatment in accordance with corrosion classes, cf. the NS-EN ISO 12944-2 standard.


In and of itself, hot-dip galvanising steel provides excellent protection. The process results in the best possible rust-protection of steel and assures a long service life free from maintenance. It is also the most economical option for surface treating steel. In hot-dip galvanisation, zinc and iron react with one another to form an alloy. The service life is typically 50–100 years, depending on climate conditions.



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