Frequently asked questions (FAQ)
Daléro Composites

GRP-profiles are structural plastic profiles that form a strong and durable alternative to traditional profiles made of steel, aluminium, wood, or concrete.

Daléro supplies, among others, rectangular profiles, strip profiles, round bar profiles, tube profiles, angle profiles, H-profiles, I-profiles, U-profiles, box profiles and 3T profiles. In addition, we specialize in custom work. View our overview of GRP profiles here.

Glass fiber reinforced plastic (GRP) profiles are more sustainable than profiles made of traditional materials such as steel, aluminum, and wood. They last longer, require less maintenance, and combine high strength with low weight. Additionally, Daléro Composites' GRP profiles are resistant to extreme weather conditions and aggressive environments. They do not rust or rot, are fire-resistant, and offer excellent resistance to various chemicals. Furthermore, our GRP profiles are radar- and sonar-transparent; this means that they allow electromagnetic waves (radar) and sound waves (sonar) to pass through without significantly reflecting or disrupting them.

GRP profiles are used in a wide range of sectors and applications. You can find our glass fiber reinforced profiles in construction, railways, transport, the energy sector, agriculture, the kitchen industry, HVAC and mobile telecom infrastructure among others..

Our plastic profiles have a glass fiber percentage of at least 60 to 65 percent. This gives them enormous mechanical rigidity and makes them perfectly suitable for heavy structural loads. The other raw materials consist of resins, pigments, and UV stabilizers.

GRP gratings from Daléro are glass fiber reinforced plastic gratings for (industrial) flooring applications. They are used as safe walkways, platform floors, landing floors, or trench covers. You can find the complete range on our page for GRP gratings.

Moulded gratings offer load-bearing capacity in multiple directions, while pultruded gratings provide extremely high strength in one specific direction. Daléro offers custom advice and selects the right grating solution for you: moulded gratings for general walkways and pultruded gratings for larger spans.

These terms apply to moulded gratings and refer to the mesh opening of the grating, ranging from larger openings to very fine-mesh safety gratings.

• Standard mesh (e.g., 38x38mm) is suitable for general industrial walkways.
• Mini mesh (e.g., 19x19mm) offers extra walking comfort and prevents smaller objects or heels from passing through.
• Micromesh (e.g., 13x13mm) provides maximum safety in wet environments and prevents tiny parts from falling through.

A standard GRP grating from Daléro weighs between 12 and 25 kg per m² on average, depending on the height and mesh size. This is up to 50% to 70% lighter than a comparable steel grating. The low weight ensures fast, ergonomic installation and lower transport costs.

Yes, GRP gratings from Daléro feature a concave anti-slip surface as standard. This makes them highly suitable for wet, oily, and industrial work environments. For extreme conditions, the gratings can be supplied ex-works with an extra slip-resistant top layer of embedded quartz grit.

GRP gratings are securely mounted using stainless steel 316 grating clips, mounting clips, or complete fixing sets. Daléro supplies these fixing materials to match the specific load, application, and type of support structure.

Daléro Composites supplies gratings and profiles as standard in various RAL colors, such as sand (RAL 1001), light grey (RAL 7035), anthracite (RAL 7016), brown (RAL 8008), and black (RAL 9005), but customer-specific RAL colors are available upon request. Because the pigment is mixed directly with the resin, the products are colored through-and-through and remain colorfast for a long time.

A JD strip is a high-quality foam strip used in the kitchen industry as a lightweight filling and support strip underneath natural stone countertops.

JD strips have been specially developed for filling and reinforcing kitchen countertops. They offer high shock resistance and precise thickness calibration. By bonding the foam strip underneath the countertop, a sandwich construction is created that enormously improves the overall stability of the surface.

Specially for the kitchen industry, interior builders, and companies working with natural stone, composite, marble, quartzite, or ceramics, Daléro has developed various products to fill and reinforce kitchen countertops and worktops. Which solution is best suited to your case depends on the material and the application of the countertop. In most cases, a JD strip or GRP profile is a perfect solution. Therefore, ensure you are well informed about the possibilities and contact the experts at Daléro.

JD strips are super easy to process into a kitchen countertop or worktop. These foam strips are specially developed for the kitchen industry; they bond well, are lightweight, stable, dimensionally stable, and calibratable.

JD strips are a cost-effective solution for filling countertops. Thanks to their light weight, they form a perfect alternative to composite offcuts. Furthermore, JD strips are easy to cut to size, dimensionally stable, and resistant to both moisture and temperature fluctuations. As a result, they offer a durable and efficient solution for a clean and stable finish of worktops.

Do you manufacture countertops for the kitchen industry and want to know more about JD strips? Please contact Daléro for technical advice, product specifications, or a sample. Our specialists will gladly advise you on the most suitable dimensions and applications for your production process. 

Glass Fiber Reinforced Plastic lasts longer, is lighter, withstands extreme conditions better, and requires less maintenance. As a result, it does not need to be replaced as quickly.

As a B Corp certified company, we are always looking for new or existing ways and strategies to improve our sustainability, innovation, and engagement. In the area of sustainability, we use the R-ladder from the RVO (Netherlands Enterprise Agency), among other tools. This R-ladder ensures that we focus on Rethink, Reduce, Reuse, Repurpose, and Recycle at every step in our business.

Daléro is very proud to be B Corp certified since 2025. This certification shows that we can truly make a difference with our gratings, profiles, and strips. A B Corp certificate is awarded to companies that meet high standards of social and environmental performance, transparency, and accountability. Following an extensive assessment and verification by B Lab, an organization receives the certification, which must be re-evaluated every three years.

As a company, we are aware of our position and opportunities to make an impact, not only within our own industry but also well beyond it. That is why we support a number of charities that align with our own mission and values.

GRP (glass fiber reinforced plastic) is a lightweight composite material made of glass fibers and resin. This material is fully corrosion-resistant, electrically insulating, low-maintenance, and has a very low thermal conductivity. Daléro Composites supplies GRP as a high-quality and sustainable alternative to traditional materials such as steel, aluminum, and wood.

GRP is applied by Daléro in industries including civil engineering, HVAC, marinas, offshore, energy sector, agri, construction, and the kitchen industry. Common industrial and technical applications of this material include walkways, structural profiles, covers, platforms, stairs, and handrails.

GRP products from Daléro do not rust, weigh significantly less than steel, and are fully electrically insulating. Due to the low weight, transport, handling, and on-site installation are much easier. Because the material is resistant to moisture and chemicals, virtually no maintenance or additional protection is required.

Yes, GRP from Daléro is excellently suited for long-term outdoor use. The composite material is optimally resistant to UV radiation, extreme moisture conditions, and large temperature fluctuations. For permanent outdoor installations, Daléro advises the use of high-quality isophthalic or vinylester resin.

Yes, GRP offers high chemical resistance, depending on the chosen type of resin. Daléro uses isophthalic resin or vinylester resin for specific chemical exposures. These resins provide maximum resistance to aggressive substances, acids, and liquids in harsh industrial environments.

Yes, GRP products can easily be cut, drilled, routed, and bonded yourself using standard tools. For a clean finish, Daléro recommends using carbide or diamond tools, such as an angle grinder or circular saw.

When processing GRP, Daléro recommends at least an FFP3 dust mask compliant with EN 149, safety goggles, and work gloves. Because fine fiberglass dust particles are released during sawing and routing, proper protection and suitable dust extraction are necessary for a safe working environment.

Yes, GRP products can be painted or lacquered, provided the surface is correctly pretreated. However, Daléro manufactures materials in the desired color through the resin (pigmentation) as standard. This prevents the color from peeling and makes subsequent painting or lacquering unnecessary in most cases.

Orthophthalic resin is the standard resin for general applications, while isophthalic resin offers higher resistance to chemicals and moisture. Daléro applies isophthalic resin to projects with increased temperature or environmental loads, such as in humid or industrial outdoor environments.

Yes, Daléro's GRP gratings and profiles can be manufactured to be fully fire-retardant. Certified according to internationally applied fire standards such as ASTM E84 Class 1, EN 13501, and BS 476, the products align perfectly with strict industrial safety regulations.

Vinylester resin from Daléro offers extremely high chemical and thermal resistance. This type of resin is specifically used in the most demanding industrial applications. It is the best choice when products come into long-term contact with highly aggressive chemical substances.

No, Daléro Composites supplies exclusively to business customers (B2B) and applies flexible minimum order quantities depending on the product type. For customer-specific projects or standard stock profiles, the minimum order may vary; please contact us directly via our contact page for the exact terms.

Yes, Daléro Composites is fully specialized in custom products and customer-specific GRP solutions. The exact delivery time and any shipping costs (within the Netherlands, Belgium, Germany, and France) depend on the dimensional specifications. You can directly request a quote.

Although the initial purchase price of GRP can sometimes be higher than steel, GRP is significantly cheaper in the long term due to a lower Total Cost of Ownership (TCO). Because GRP from Daléro does not rust and requires no periodic painting, maintenance and replacement costs are completely eliminated. This makes it an economically and sustainably viable investment.