Powder coating

High corrosion protection and finish

NOT possesses extensive expertise and holds a market-leading position in powder coating for aluminum, steel, and hot-dip galvanized steel. 

In addition to providing a surface with high corrosion resistance and long life, powder coating has no volatile solvents. Overspray is recycled, and the process generates minimal waste, which contributes to a positive work environment, reduced emissions, and saved resources.

We also offer chrome-free pre-treatment for powder-coated aluminum.

Pulverlakkering. Foto.

We can offer transportation

Bergen–Stavanger / Stavanger–Bergen
Stavanger–Kristiansand–Østlandet / Østlandet–Kristiansand–Stavanger
We are also helpful with other destinations.

Feel free to contact our planner for transportation pricing
phone: (+47) 93 48 41 18,
email: post.pulverlakk@not-as.no.

Contact (+47) 93 23 87 71

Trond Sverre Aarsland
Operations Manager/ Planner
(+47) 93 23 87 71
Kari-Anne Thu
Head of Administration
(+47) 97 61 93 19
Ivar Salte
General Manager
(+47) 98 29 63 84

Technical information

Powder coating explained

Powder coating essentially consists of the same main ingredients as a wet coating system, excluding the fact that many of these systems contain solvents. The properties come from binders, curing agents, pigments, and various additives. The binder is typically epoxy, polyester, or a combination of these. The powder coating is electrostatically charged, sprayed onto the product, and achieves its final texture through melting and curing in a curing oven at temperatures of 180–200 °C.


Choosing the right pretreatment is of crucial importance for the durability of the coating. To achieve optimal durability, we place great emphasis on giving the product the correct pretreatment in a modern multi-stage immersion system. We use the most reputable chemicals available in the market. For hot-dip galvanized materials, zinc-manganese phosphate is used.

This pretreatment is the key to the coating system. As no coating layer is completely diffusion-tight, this pretreatment will passivate the metal surface, thus preventing corrosion.

Powder Application

After the chemical pretreatment, the objects are dried in an oven and hung on a conveyor line. The powder is electrostatically charged using guns and is blown towards the grounded object, which, due to the voltage difference, attracts the powder coating. The force is consistent across the entire surface, resulting in an even and automatic layer formation.

Prinsippskisse pulverlakk. Grafikk.


After the powder has been applied, the process continues through the curing oven where the powder coating melts and cures at 180–200°C.

Quality Control

When the objects come out of the curing oven, they are first visually inspected, and then the film thickness and gloss level are checked.


Powder coating can meet the market’s strictest requirements, including long-term corrosion resistance, chemical resistance, and finish. Powder coating, combined with the right pretreatment, is ideal for hot-dip galvanized steel and aluminum, where both excellent corrosion protection and a decorative surface are desired. Typical examples include profiles, fittings, building panels, railings, stairs, agricultural equipment, park furniture, and more.

Additionally, we stock aluminum sheets for coating.

We offer the option to laminate all relevant plate dimensions from 1000×2000 to 1500×3000.

We also keep aluminum sheets in stock for sale in the following dimensions:
1 mm × 1250 × 2500
1.25 mm × 1250 × 2500
1.5 mm × 1250 × 2500
1.5 mm × 1500 × 3000.

NOT places great emphasis on optimal quality assurance processes with a focus on the environment. We are certified according to NS-EN ISO 9001:2015 and 14001:2015.

Powder coating of hot-dip galvanized steel is carried out according to NS-EN ISO 12944-2, EN ISO 1461, NS-EN 13438, and KVS 200.

Significant new investments were made in 2018–2019, making the factory one of the most modern in Norway.


Maximum dimensions of objects:

Length: 8000 mm (7200 mm for aluminum) x Width: 800 mm x Height: 1500 mm

Maximum weight: 800 kg.

Chemical pretreatment for aluminum:

13 baths – Width: 0.8 m x Height: 1.5 m x Length: 7.35 m.
Drying at 80 °C.

Pulverlakkering, maks dimensjoner. Grafikk.

Chemical pretreatment for steel/hot-dip galvanized steel:

13 baths – Width: 1.2 m x Height: 1.5 m x Length: 8.85 m.

Drying at 80 °C.

Outgassing before powder coating at 200 °C.

Curing oven length: 48 m.

To achieve the desired corrosion protection, the factory has two separate chemical pretreatment systems. One system consists of two different pretreatment processes: chromating for aluminum and a chrome-free alternative. The other pretreatment system involves Zinc Manganese phosphate for hot-dip galvanized steel and carbon steel. These are the three processes that currently provide the best corrosion protection.

Technical requirements for aluminum

The surfaces must always be clean, free from paint spots, white rust (aluminum oxide), and adhesive residue from any packaging tape.

Anodized objects should be avoided in favor of untreated ones.

The objects to be painted must not have come into contact with silicone or silicone-containing substances. For example, lubricant on the nozzle during CO2 welding, or silicone residue on hands after caulking work. Silicone and silicone gas lead to craters in the paint surface. When lubricating production machinery, only lubricants marked as silicone-free should be used.

“White rust” (aluminum oxide) in such large quantities that pitting corrosion occurs on the surface will be considered goods that are not covered by the warranty.

Drainage: For constructions with pipes and other closed or semi-closed details, sufficient drainage must be present. This means drainage holes and openings that allow liquids from pretreatment baths to easily exit the object when lifted out of the baths. If uncertain about this, please contact us preferably before production starts.

Details should not be assembled before painting. Adjacent surfaces act capillary-like in pretreatment baths. Liquid drawn into this gap emerges from the openings like steam from a pressure cooker when the paint is cured at 180-200°C. This steam damages the paint surface in the area around the vent hole.

Requirements for orders

The corrosion class to which the objects will be exposed must be agreed upon in advance. Different usage environments are divided into corrosion classes, ranging from class C1 (dry indoor) to class C5 (aggressive industrial environment/outdoor coastal climate). Relevant corrosion classes are achieved through the combination of metal, pretreatment, and topcoat type.

For outdoor use, only polyester coating should be used. For indoor use (i.e., not exposed to sunlight), epoxy can be applied.

All orders must be accompanied by scaled drawings/sketches and a specification of the relevant coated surface. Along with the drawings, it should be clearly indicated where the objects will be installed (e.g., east, west, north, south facade, building, project, etc.).

Adhesion warranty must always be agreed upon in advance through the offer/project.

Plates that crack after coating are not covered by the warranty program.

Description for Powder Coating of Hot-Dip Galvanized Steel

Steel is an excellent material for use in architecture due to its strength, malleability, and welding possibilities. Hot-dip galvanizing has proven its remarkable ability to protect steel against corrosion over several generations.

In recent years, systems for powder coating of hot-dip galvanized steel have been developed to meet high requirements for adhesion to the zinc coating combined with a high surface finish. Since hot-dip galvanizing itself provides a relatively “coarse” surface treatment, certain requirements must be placed on the steel quality to ensure that the product can achieve the desired corrosion class and surface finish.

Steel quality and finish of the final product must always be agreed upon in advance.

Requirements for orders

Steel that is unsealed, aluminum-stabilized, or has silicon content lower than 0.02% is always required for the best finish (NOT Pulverlakk AS’s finish class 1).

This steel will also provide a glossy and uniform surface.

Steel with silicon content between 0.15% – 0.20% can be used for finish class 2.

It might be sensible to selectively determine the need for finishing level, so that not everything on, for example, a railing requires the same finish, but rather limit the best finish to, for instance, the handrail. This is done to cost-optimize the product.

NOT Pulverlakk AS can offer, by mutual agreement, a 15-year guarantee against chipping as well as a classification of the surface finish included in ZiPoCoat (hot-dip galvanizing + powder coating).

All of these measures are taken to ensure that we can deliver a quality product that aligns with customer expectations.


NOT Powder Coating AS can, upon further agreement, offer a 15-year warranty against peeling as well as a classification of surface finish included in the NOT-PROCESSES® (hot-dip galvanizing + Zinc Manganese phosphate + powder coating).

All of these measures are taken to ensure that we are capable of delivering a quality product that meets customer expectations.

The warranty covers adhesion of powder coating to the base material.

The warranty is based on many years of experience and development that give us confidence in the adequacy of our procedures. Thus, the warranty applies up to and including corrosion class C5 according to NS EN ISO 12944-2:1998.

The warranty is based on the application of the best pre-treatment chemicals and expertise, as well as the best powder qualities available in the market.

The warranty covers the coating of aluminum and hot-dip galvanized steel.

For the coating of hot-dip galvanized steel, it is a prerequisite that the correct steel quality is used (according to technical requirements for NOT-PROCESSES®) and that both hot-dip galvanizing and powder coating are carried out by companies within Norsk Overflate Teknikk AS (NOT).

Powder-coated surfaces must be washed as soon as possible and no later than 3 months after installation. Maintenance of the surface is limited to simple cleaning with mild soapy water. The frequency of cleaning depends on the environment in which the products are used and the appearance requirements. We recommend cleaning before contaminants penetrate the surface, but an annual wash is considered a minimum regardless of the environment in which the products are used. In a marine environment (splash zone/shoreline) and heavily industrial-polluted environments, it is recommended to increase the frequency of cleaning.

Any defects resulting in powder coating peeling off will be rectified by us on-site. We will, upon agreement, cover the cost of coating material, labor, and travel expenses necessary to repair any defects.


NOT contributes to accessibility in nature

NOT have been involved in two exciting projects that will make it easier for you to navigate through nature.

We choose green zinc

The zinc we purchase is produced in the most environmentally friendly manner possible, prioritizing climate consciousness.

NOT is investing in renewable energy!

Norsk Overflate Teknikk is committed to sustainable energy.