All Humidur® products are two-component solvent-free epoxy coatings, developed and solely produced by Acotec. The product was initially developed to stop underwater heavy marine corrosion. Since its first application in 1984, the product is claim-free until today.

Heavy-duty performance and outstanding properties

The Humidur® coatings are on the market since 1984. Since that first application, the system is claim-free from any failures on the coating and on the application, even in highly corrosive environments. The system has proven to be maintenance-free when there has been minimal or no mechanical impact.

Humidur® is a system designed to use in all kinds of water and has a high chemical resistance at the same time. The system has proven to be effective in salt, brackish, fresh, drinking and even waste water. It also protects steel tanks and pipes with more aggressive chemicals.

In the marine and shipping industry, the products may also be used in submerged, splash zone and tidal areas and in atmospheric zones. In other words, Humidur® is able to function on the complete structure. This is proven in practice on multiple structures for several decades!

Other properties include:

  • Proven lifetime of over 30 years in highly corrosive environments
  • Stops biological corrosion
  • Practical results show adhesion strengths of over 20 MPa
  • Can perform in a wide range of temperatures from -35°C up to 150°C
  • Resistant to most fluids between pH 0 and 14
  • Excellent abrasion and impact resistance
  • Surface tolerant: minimal surface preparation can be done
  • Unlimited overcoating
  • Excellent cathodic disbondment resistance
  • Any RAL-color is available (except anti-fouling)
  • Humidur® gives a very smooth surface to increase the flow velocity of pipe structures

Humidur® has approvals for drinking water, offshore, petrochemical, etc. The coating system has also been approved by several governmental agencies such as: ABS (American Bureau of Shipping), CCS (Chinese Classification Society), USACE(United States Army Corps of Engineers), BAW (Bundesanstalt für Wasserbau), Norwegian Defense, etc.

Technical back-up is available from TNO, SGS, Royal Haskoning, University of Ghent, University of Antwerp, Maritime Academy of Antwerp, EXOVA, TÜV Rheinland, etc.


The Humidur® coatings proved to be the most cost-effective solution according to a life cycle cost analysis conducted by Royal Haskoning. This can be explained by the fact that the coatings are maintenance-free and by the durability of the system (proven life time of over 30 years). Furthermore, Humidur® is a one-coat systemreducing the application and labour costs and the amount of waste.

User friendly

All Humidur® coatings are single layer systems. The application can be done straight onto the substrate after surface preparation, which means that no primersare required. This makes the Humidur® coating probably the fastest applicable liquid epoxy on the market. There will be no risk of contamination between layers or problems with interadhesion.

If requested, several layers can be applied wet-on-wet without waiting time, as no individual layer needs separate curing because of the absence of solvents (WFT = DFT). This is in contrast to alternative solvent-based coatings, which are limited in layer thickness as solvents need to evaporate after every layer.

Other advantages of Humidur® include:

  • Capable of curing under water and at freezing temperatures: the structure may be submerged immediately after coating application
  • Can be applied in a relative humidity up to 95%
  • Humidur® is safe to work with: flashpoint > 100°C and even >120°C
  • Can be applied easily by spray, brush, roller or caulking variant

Environmentally friendly

The Humidur® coatings were developed “avant-la-lettre” and were composed with a clear vision towards the future. The coatings contain no solvents, no heavy metals, no coaltar, no isocyanates, no VOC’s and no TBT. The product has 100% solids and is perfectly safe for the environment.

Humidur® is capable of curing under water without leaching taking place and has no detrimental effect on the sediment, fauna and flora in and out of the water. When using Humidur® on static marine structures, the biofilm can form itself on top of the Humidur® coating without affecting the substrate and without any loss of properties. For the anti-corrosion coatings, almost 30-year old coupons proved there is no migration of the corrosive elements towards the substrate. Humidur® stops biological corrosion and MIC without affecting or killing the bacteria.

Humidur® AF is the anti-fouling coating in the product range when the formation of a biofilm is unwanted.

As Humidur® is a single layer system, less waste will be created in the process.

On-site support by Acotec

Acotec is the worldwide expert in the field of anti-corrosion technology, providing a complete service from corrosion mechanisms and corroded steel inspection through to corrosion damage cleaning and repair and Humidur® corrosion protection.

Acotec provides the full service from coating manufacturing, to coating application and quality control in cooperation with its clients. Acotec can provide the full equipment and technical assistance which makes the Humidur® products to the most complete products on the market.

To see how Acotec applies these Humidur® products under the highest quality standards, Acotec develops and builds cofferdam to comply with the demand on the market. Furthermore, Acotec offers special access and application technologies such as pigging and robotic technology, rope access, gantries, barges and automated spray equipment.  For more information please visit


Corporate warranties are issued by Acotec up to 30 years depending on the application conditions. More information upon request.

An insurance policy of 10 years, given by HDI Gerling, is available on all Humidur anti-corrosion coatings in case of optimal surface preparation. This is the highest insurance available on coating and application. For the terms and conditions on this warranty, please contact Acotec nv directly.

Benefits specific for Offshore Oil and Gas Market

  • One-coat system
  • Capable of curing under water
  • Surface tolerant: even under minimal surface preparation conditions the coating withstands extreme conditions (adhesion values reach up to 25 MPa)
  • Safe to work with: flash point > 100°C
  • Resistant to harsh exposure conditions: can be applied in submerged, splash zone and tidal areas and atmospheric zones
  • Maintenance-free
  • Can be applied in a relative humidity up to 95%
  • Can be applied easily by spray, brush, roller or caulking variant
  • Norsok M-501, n° 7 approved
  • Anti-fouling also for static structures
  • NDT inspection allowed

The Humidur® products have been successfully applied in the offshore oil and gas market by following companies: Shell, Statoil, ConocoPhilips, Talisman Energy, Maersk Offshore, Transocean Drilling, Fairfield Energy.