Frequently Asked Questions

You can place an order with one of our natural stone workers. He will measure the project, order the concrete slab directly from Kwantz, manufacture it according to plan in his workshop and install it. You can find a list of our partners here.

If you want to see our different concrete colours in real life, you can make an appointment with one of the natural stone workers we partner with. It is also possible to book a visit in our production.

The presence of small air bubbles is inherent to concrete. These are only visible in sawn edges or in cut-outs of an undermount sink. You can choose to keep this natural character or ask the natural stone worker to fill them.

The ultra-strong concrete slabs from Kwantz come in one standard size, namely a length of 3260 (+/- 2 ) mm, width 1383 (+/- 2) mm and a standard thickness of 25 (+/- 1) mm. A thicker looking concrete worktop can be achieved by working with mitered edges.

The new ASTOR color range no longer needs to be nourished after installation. Kwantz provides the concrete with an invisible and permanent stain protection, capable of forming a molecular bond with the material without sealing the surface, which remains breathable. This allows some substances to still penetrate and then evaporate. This technology enhances the material's strong, natural properties and extends its lifespan. The process changes the surface tension of the concrete, making it much more difficult for liquids like water, coffee, or oil to penetrate. Because Kwantz concrete is resistant to sunlight and UV rays, the colors and natural properties are preserved over time.

Kwantz belongs to the group of calcareous stones (such as bluestone, marble, travertine) that require specific maintenance. Therefore, descaling products must be avoided when cleaning the surface. It is best to clean your countertop with a neutral degreaser or water and natural soap. This prevents grease from building up on your countertop. Acidic degreasers based on vinegar or lemon must not be used, as they will decalcify the stone, possibly causing white stains. Use products suitable for cleaning calcareous (natural) stone.

Kwantz is a stone that belongs to the family of calcareous materials. The stone is alive, evolves, and may develop a patina over time. Like other calcareous natural stones (such as bluestone, marble, travertine), Kwantz is sensitive to acids. Spilled vinegar, red wine, or lemon should be wiped up immediately as they may permanently damage the surface. Keep the surface dry after each use and do not leave wet objects standing for long periods, such as a plant pot. TIP! Wipe stains and splashes with a damp cloth and do not let them dry.

Don’t worry: with products like Goodbye Stain, these organic discolorations can usually be removed quite easily — just be sure to follow the supplier’s instructions.

Is there a slight acid etching? In most cases, it’s just a few small splashes that will gradually blend into the natural color variations of the surface. The worktop evolves with use and develops a unique patina over time.

If you want to refresh the worktop after a few years of use — or before selling — a professional can sand the surface lightly and reapply a stain protector. This is one of the key advantages of natural stone: it is pigmented throughout, making it perfectly restorable and renewable. This ability to restore the surface extends the lifespan of the worktop and actively contributes to a more sustainable use of materials.

The surface of Kwantz concrete is very scratch-resistant, but it is not harder than steel for instance. In any case, the use of a cutting board with any type of worktop is recommended to maintain the character of the material.

It is recommended to always use a coaster for hot pots and pans.

Just like for concrete kitchen countertops, it is recommended to impregnate your stone. This will make the cleaning process easier. You can clean your Kwantz concrete in the bathroom with a soft sponge and a cleaning product that is specially intended for cleaning natural stone.

Use little detergent and brush over the concrete surface until all lime and soap residue is gone. To clean taps and shower head, use a limescale cleaner by applying it to a cloth (but don’t spray it directly). This will prevent the concrete from being damaged.