Features, quality standards and maintenance

Anti-rust treatment for steel
All our steel products are thermally galvanized. The zinc forms a durable protective layer that prevents the formation of rust. The thermal galvanizing procedure takes place in accordance with NEN-EN-ISO 1461.

Steel coatings
Nearly all our steel products can be provided with a powder coating in the RAL colour of your choice. These are all applied over the galvanized steel, which means that the full coating provides a very durable protection against the formation of rust. The powder coating is applied to the galvanized steel in accordance with NEN 5254 (the standard degree of gloss for the powder coating in a RAL colour is 80%). One important aspect of this standard is that for exterior products no unevenness is visible from up to 3 metres. Some products can be delivered in all RAL colours. In a number of cases a surcharge is payable.

Wood and maintenance
Wood is one of the purest natural materials. The quality is determined by many factors during the growing process of the tree and during the processing of the wood. VelopA carefully selects the correct type of wood for every application and places high demands on its suppliers. VelopA considers that small natural irregularities are acceptable because they accentuate the natural appearance. This is a conscious choice that VelopA has made for its customers. Non-natural unevenness, course natural unevenness and deficiencies in the wood that affect the functioning or use of the product are not acceptable for VelopA.

When pouring concrete products there are many factors that influence the final quality and appearance of the end product. Nuances of colour and small areas of unevenness are inherently associated with the material and the production methods give the product a natural appearance. A crack that causes injury, damage to clothing or that weakens the product (a crack that runs too deep) is not acceptable. A hairline crack in the surface is acceptable and VelopA has made a conscious decision in this respect. Structural and/or rough unevenness and differences in colour are not acceptable. During the hardening process limestone seeps from the concrete. This leaves a white deposit on the concrete, which cannot be avoided. For dark grey products such as Etna and Brick the outer surface is rubbed down with a layer of Color Fresh as soon as possible after production. This prevents further seepage of limestone. Since the product has to harden for one day in the mould, seepage of limestone cannot be prevented 100%. The material is therefore subject to slight staining.
Any slight differences in colour that may arise during production and/or storage cannot be prevented. Etna and Brick products also tend to discolour slightly over time, although the nature and extent of this will vary, depending on the amount of weathering to which the product in question is exposed.
Concrete products for which strength is very important, are provided with reinforcement.

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