HDP Color-coated Steel Strips for Sustainable Construction in the Netherlands

Driven by the Dutch government’s 2030 carbon neutrality goal, a BREEAM Excellent-certified eco-friendly commercial complex in Amsterdam faced a challenging choice of roofing materials. Traditional color-coated panels often suffer from coating powdering within five years in the strong winds and salt spray of the North Sea, and the PVDF coatings provided by local suppliers were expensive. In the end, they cooperated with Wanzhi Steel and ordered 420 tons of color-coated steel strips.

Customer Background

The Netherlands boasts some of the highest environmental standards in Western Europe. The project’s general contractor discovered our company’s HDP high-weather-resistant color-coated steel strip through a Google search. Using China’s independently developed nano-modified PVDF technology, it achieves an A++ weather resistance rating according to the European standard EN 10169-2012, and is priced 22% lower than similar European products. After three rounds of video factory inspections and on-site sample testing, this exemplary international purchase was ultimately concluded.

Order details

• Product Name: HDP High Weathering Resistant Color-Coated Steel Strip (PVDF Coating).

Substrate Specifications

• Base Material: DX51D + AZ150 (Aluminum-Zinc Alloy Substrate).
• Thickness: 0.5mm/0.6mm (±0.03mm tolerance).
• Width: 1250mm, custom slit width up to 334mm, 500mm.

Coating System

• Front: 25μm PVDF Fluorocarbon Coating + 5μm Primer.
• Back: 15μm PE Polyester Coating.
• Color: Back: RAL 9006, Front: RAL 9004 Signal Black.
• Surface Finish: Matte.
• Quantity Ordered: 420 tons (28 40-foot HQs).

Packaging

• Each roll is wrapped with anti-scratch PE film and moisture-proof paper, steel corner guards, and honeycomb cardboard edge protection.

Breakthrough performance enabled by materials science

Climate Lab Data:

In a cyclic test simulating the Dutch coastal climate (7 days of salt spray + 7 days of UV + 3 days of freezing), our materials outperformed the Netherlands National Institute for Building Research (TNO) baseline by 38%.

On-site monitoring comparison

Compared with the German brand used during the same period, on the same building facade, the color difference change ΔE value of our product is 0.7 lower (measured after 8 months of use).

Project production process

Raw Material Preparation, Degreasing, and Cleaning

Select standard cold-rolled steel strip as the substrate, inspect its thickness, width, and surface quality, and then unwind and cut it. Chemical degreasing or electrolytic cleaning removes oil, dust, and rust.

Surface Pretreatment

Phosphate or chromate treatment forms a chemical conversion film on the steel strip surface. Chromate or chromium-free passivation treatment improves the steel strip’s corrosion resistance.

Primary Coating (Primer), Finish Coating (Topcoat), and Curing

Using a roller coating process, apply a uniform layer of primer to the steel strip surface, bake it at high temperature, and then apply a HDP topcoat and bake it at a high temperature.

Cooling and Straightening

The steel strip is cooled to room temperature using air or water cooling systems. A straightener is then used to eliminate any wavy or warped deformations that may have occurred during processing.

Quality Inspection

• Appearance Inspection: Check that the coating surface is flat and free of bubbles, cracks, or flaking.
• Performance Testing: Test coating thickness, adhesion, corrosion resistance, weatherability, and other indicators.
• Dimensional Inspection: Confirms that parameters such as steel strip thickness, width, and length meet standards.

Splitting and Packaging

Steel strips are slit into specified widths and lengths according to customer requirements. They are then packaged with rust-resistant film, wrapped with belt, and secured to prevent damage during transportation.

Finished Product Storage

Qualified color-coated steel strips are stored in the warehouse, sorted by specification and batch, and await shipment.

Architect’s Notes

“This isn’t just a simple material procurement exercise; it’s an industrial collaboration across the Eurasian continent. The Chinese supplier’s rapid response to the EN 13523-7 anti-graffiti test has opened our eyes to new possibilities in the global supply chain.”

—Prof. de Vries, Chief Architect of the project

If you are interested in color-coated steel strips, welcome to contact us.

 

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