How to choose an Alveus granite sink – hardness, color, and material durability
How to choose an Alveus granite sink – hardness, color, and material durability
A granite sink is one of the most popular solutions for a kitchen draining area today. If you have decided to invest in the Alveus brand, you have made a good first step – it is a manufacturer with a long tradition that produces its sinks from its own composite material called Alvéus Granit (sometimes also referred to as Alvéotec). However, with so many models, colors, and configurations available today, it is easy for an average customer to get lost. This article will help you understand what a granite sink is actually made of, why the hardness of the material matters, how individual color shades behave in everyday kitchen use, and what to pay attention to when making your final choice.
If you are also interested in how granite sinks compare to stainless steel alternatives, please see our separate article Alveus granite sink vs. stainless steel sink – comparison of properties and maintenance. Here we will focus exclusively on the granite line.
What is a "granite" sink – material composition and production
The term "granite" can be a bit misleading. It is not a natural stone carved from a granite block. It is a composite material whose base is a mixture of natural quartz sand, acrylic resins (PMMA – polymethyl methacrylate), and pigment additives. The mineral filler content in Alveus products is usually around 80 %, while the remaining 20 % consists of resin matrix and colorants.
This high proportion of mineral fillers is key. The higher the proportion of aggregate (quartz sand, granite, slate), the harder, heavier, and more heat-resistant the final product is. Alveus states that the hardness of its composite sinks ranges from 3 to 4 on the Mohs scale – for comparison: pure acrylic reaches about 2–2.5 Mohs, steel is around 5–6 Mohs, while natural granite is around 6–7 Mohs. So yes, the granite composite is softer than natural stone, but significantly harder than pure acrylic or enamel.
From a production point of view, it is also important how the sink is shaped. Alveus uses a press or gravity casting method – the result is a monolithic piece without welds or joints, which significantly affects long-term hygiene quality and resistance to moisture penetration. Gaps and welds are the first places where bacteria settle and where corrosion processes begin.
Material hardness – why it is essential for a kitchen sink
Hardness is not just an abstract number on paper. In a kitchen sink, it has a direct impact on everyday life. Here are practical scenarios I encounter regularly:
Resistance to scratches
Normal kitchen use means that cutlery, pots, lids, and various metal objects fall into the sink daily. On a clean acrylic surface, you would see a network of fine scratches after a few months, which degrade the appearance and also create micro-grooves where dirt sticks. The Alveus granite composite is significantly more resistant – scratches appear much less frequently during normal handling. This does not mean it is "indestructible"; if you systematically scratch the sink with a stainless steel wire brush, the surface will also be damaged. However, with normal use and proper cleaning, it will maintain its smooth matte surface for years.
Thermal resistance
The Alveus granite composite can withstand short-term contact with hot objects up to about 280 °C. This is enough to place a hot pot taken from the stove into the sink, but not a hot cast iron pot directly from the oven. This limit is significantly higher than with pure acrylic, where a hot pot would realistically damage the sink. However, Alveus always recommends placing a wire mat or silicone stand in the granite sink to extend the surface's lifespan. When a customer asks, "Can I put hot pots in there?" – the answer is: yes, short-term and occasionally; not as a daily routine.
Resistance to impacts
Here comes one of the few disadvantages of granite composites compared to stainless steel: they are more brittle. Natural stone and its composite version belong to a group of materials that tolerate tension worse than metal. This means that if a heavy ceramic bowl falls into a granite sink from a height, it may crack or chip a small piece of material. This happens rarely, but it does happen – granite composites are more vulnerable to impacts than stainless steel. We will discuss this in more detail in the article Common problems and issues with granite sinks – cracks, drain, sealing.
Color options for Alveus granite sinks – what each color really means
Alveus offers granite sinks in several basic color lines. Each of them has different optical properties and reacts differently to normal use and dirt. Choosing a color is not just an aesthetic choice – it is also a practical consideration.
Black (code 91) – elegant, but demanding
Black is the most popular shade for a long time. It visually minimizes the visibility of fixtures and minor scratches, which sounds great – and it really does. The problem is the opposite: black color brutally highlights every water drop, so limescale stains and water spots are clearly visible. If you live in an area with hard water (which is most of Slovakia outside mountainous areas with soft spring water), you will have to polish and wipe the black sink practically every day after use, otherwise it will always look dirty.
A great example is the model ATROX 50 black 91 + pop-up drain – a robust sink with dimensions 790 × 500 mm, which looks fantastic, but I always warn customers to have realistic expectations regarding daily maintenance. Someone who lives alone and cooks little can manage it without problems. A large family with intensive kitchen use and hard water will have to wipe the sink dry after every major washing.
Natural (NAT) – a universal compromise
The "Natural" or "NAT" shade is a warm beige-cream tone with a subtle stone texture. This shade is probably the most practical from the perspective of daily use – water stains are less visible than on black, and the sink does not look permanently dirty like white does with heavy soiling. Scratches are also less noticeable than on dark shades.
A typical representative in this category is the model ZOOM 10 NAT – a compact solution for smaller kitchens, where the customer does not have to worry about constant polishing and at the same time gets a warm color note that matches a wooden or laminate kitchen set.
Grey (Grey, Graphite) – the hidden champion
Grey in various shades (light grey to dark graphite) is probably the best choice in terms of optical resistance to daily wear and tear. Limescale stains are significantly less visible than on black, and the sink looks visually clean and does not invite a feeling of mess. Grey also blends well with a modern grey kitchen line or with white – it is a neutral shade that does not look outdated or too extravagant.
Bronze, Cappuccino, Sahara – warm tones for warm interiors
These shades are less popular, but they have a loyal group of customers. They suit especially kitchens with warm wooden surfaces, natural stone, or terracotta flooring. From a serious practical point of view, they behave very similarly to natural (NAT) – water stains are less visible, and maintenance is manageable.
White – most susceptible to visible wear
A purely white color is visually beautiful, but from a long-term perspective, it is the most susceptible to visible staining when in contact with coffee, tea, red wine, or tomato juice. If someone cooks a lot and is not willing to rinse the sink thoroughly and immediately after every contact with staining foods, white is the wrong choice. White shades also highlight scratches more over time.
You can read more on this topic in the article Which granite shade to choose – comparison of colors (black, white, grey, bronze).
Surface finish – matte vs. glossy surface and what it changes
Alveus produces granite sinks exclusively with a matte surface. It is important to know this, as many customers come with the expectation of a glossy stone, as seen in the showroom of another manufacturer. A matte surface has several specific advantages:
- Less visible scratches – a fine scratch is much harder to notice on a matte surface than on a glossy one
- Less optical effect of water droplets – droplets on a matte surface do not create such pronounced circles
- Better grip of wet objects – a glossy surface is more slippery when touched
- Durability of the surface – a matte surface does not lose its sheen, as it has none; a glossy surface, when damaged, creates visible stains without sheen
The only "disadvantage" of matte is that some customers subjectively perceive it as less "premium" aesthetics. This is purely a personal matter – from a technical point of view, a matte surface is a better choice for a kitchen sink.
Sink configuration – one basin, two basins, with a drip tray
Alveus granite sinks are available in many configurations. When choosing, consider primarily the size of the cabinet under the sink and how you work in the kitchen.
Single basin is suitable for smaller kitchens (cabinet length 45–60 cm) and for households where less cooking is done and the sink is mainly used for quick dishwashing. A large single basin sink (60–100 cm) is ideal for those who wash large pots and need maximum working space in one area.
Double basin – one large for washing, the other smaller for draining or separation: this is a classic solution for active kitchens. I warn customers that a double basin sink requires a cabinet of at least 80–90 cm, so both basins have a meaningful width.
Drip tray (a ribbed area next to the main basin) is practical if you do not use a dishwasher or if you supplement it with manual washing. The drip grooves must be sloped in the correct direction – water must flow back into the basin, not onto the work surface. This is a technical detail that is worth asking about for a specific model.
If you are thinking about dimensions and how to adapt the sink to your cabinet, read the article What sink size do I need – how to measure the cabinet and choose the right dimensions.
Sink and faucet sets – advantages of a complete solution
Alveus sells not only individual sinks but also complete sets where the faucet and sink are matched into one aesthetic unit. This makes practical sense: it saves you the trouble of worrying whether the faucet's outlet height will be sufficient for the depth of your sink or whether the color of chrome or matte brass will match the granite shade.
For example, the ALVEUS INTERMEZZO 130/81 + TONIA Chrome Faucet Set is a premium solution for larger kitchens – the sink with dimensions 1300 × 810 mm features a large working basin suitable for intensive cooking, combined with a stylish chrome faucet. Similarly, the ALVEUS INTERMEZZO 30/91 + DELOS 91 Faucet Set offers a black version of the sink and faucet in a harmonious design unit – a perfect choice for a modern dark kitchen, where the customer is aware of the higher maintenance requirements and is prepared for it.
For more compact kitchens, I recommend looking at the ALVEUS CADIT 40/55 + RUTA Chrome Faucet Set – a smaller sink suitable for small kitchens or a secondary work zone next to an island, again completely solved including the faucet.
Chemical resistance and daily maintenance – what the material can withstand
The Alveus granite composite is resistant to common kitchen chemicals – dishwashing detergents, degreasers, and mild acids (lemon, vinegar in normal dilution). Problems arise in the following cases:
- Concentrated acids – undiluted vinegar in direct contact for a long time, or professional descaling agents without dilution, can damage the surface
- Strong alkaline cleaners – some industrial degreasers when used repeatedly can dull the surface
- Acetone and solvents – absolutely not, they always damage the surface
- Abrasive powders and steel wool – leave micro-scratches, over time they dull the surface and damage all color finishes
Standard recommended maintenance is simple: rinse with clean water after each use, wash once a week with a regular liquid dish soap and a microfiber cloth, and in case of limescale use a weak citric acid solution (one tablespoon in a glass of water) or a commercial descaler suitable for granite. More details can be found in the article Cleaning and maintenance of a granite sink – what to use and what to avoid.
Where the material can behave unexpectedly – practical experiences
Over the years of working with customers, I have noticed several situations where the granite sink surprised – sometimes positively, sometimes less so:
Case 1 – White kitchen + black sink + hard water: A customer from Trnava bought a black Alveus sink for a white modern kitchen – a visually impressive contrast. After three months, they asked why the sink had "grayed out". The answer was simple: calcium from undecalcified water formed a white film on the dark surface. The solution was to establish a routine of drying the sink after each use and treating it with a descaler once a week. The sink has been in perfect condition ever since – it just requires discipline.
Case 2 – Ceramic pot from the oven directly into the sink: A customer from Nitra placed a ceramic baking tray directly into a cold granite sink. The thermal shock caused a micro-crack in the corner of the basin. Although Alveus is better than classic acrylic in terms of thermal shock resistance, a sudden temperature change (for example, 220 °C vs. 15 °C cold water) is a risk for any composite or stone material. Lesson learned: let hot items cool down for a while before placing them in the sink.
Case 3 – Painting the kitchen and no protection for the sink: A kitchen renovation, the sink was installed before painting. The paint with a tinted pigment settled on the edge of the sink – almost invisible on a gray shade, but a visible stain on a white sink. Lesson learned: always cover the sink with foil during renovation work.
Sink weight and requirements for the base
A granite composite sink is significantly heavier than a stainless steel one. While a standard stainless steel sink weighs 4–8 kg, a granite sink of the same size ranges between 12 and 22 kg, depending on the model and configuration. For larger models (e.g., a sink of 130 × 50 cm format), the weight can reach up to 25–28 kg.
What does this mean in practice? The cabinet under the sink must be sufficiently robust – a standard kitchen cabinet made of DTD/MDF can usually handle weights up to 25–30 kg, but for older or cheaper furniture, it is advisable to consult the furniture manufacturer. The installation of the sink is physically more demanding and I recommend doing it with two people. More about the installation can be found in the article Installation of an Alveus granite sink – installation procedure including the trap and faucet.
Most frequently asked questions from customers (FAQ)
Is the Alveus granite sink really scratch-resistant? Can I put cutlery in it?
Yes, the granite composite is significantly more resistant to scratches than pure acrylic. Normal handling – falling cutlery, placing plates, washing mugs – the sink can handle without visible scratches for years. Problems arise with systematic and intensive abrasive stress (steel wool, abrasive powder). Therefore, even with granite it applies: use soft sponges and liquid cleaning agents.
Why does my black granite sink look white-gray after washing? Is something wrong?
Yes, this is normal and it is limescale – deposits of calcium and magnesium from hard water. Stains are much more visible on a black surface than on lighter shades. The solution is to regularly dry the sink with a towel after use and to treat it weekly with a mild descaler or a citric acid solution. The sink is not damaged – it is just stained.
Can I place a hot pot directly from the stove or oven into the Alveus granite sink?
Occasionally and with caution, yes – a hot pot from a gas stove (bottom temperature about 100–150 °C) can be placed in the sink. The problem is a sudden thermal shock: if you place a pot at a temperature of 220–250 °C into a sink where cold water (10–15 °C) is running, the temperature difference can cause micro-cracks in the material. Alveus recommends always using a silicone mat for protection. This is a similar rule to natural stone – heat is fine, but thermal shock is not.
Is it worth buying a sink and faucet set instead of purchasing them separately?
In most cases, yes, and for several reasons. The set is color- and dimension-matched – the faucet height is designed for the specific sink depth in the set. When buying separately, you have to check yourself whether the faucet height is sufficient (minimum 10 cm above the top edge of the sink) and whether the color option matches harmoniously. Sets are also usually slightly cheaper than the combined price of both items bought separately. For customers without technical experience, a set is a clearly safer choice.
What is the lifespan of an Alveus granite sink?
With proper maintenance and normal use, the realistic lifespan of an Alveus granite sink is 15–25 years. Alveus provides a standard 10-year warranty on manufacturing defects for its sinks. In practice, sinks that are cared for according to recommendations often last even longer without visible deterioration. A condition for long life is to avoid strong acids, abrasives, and intense thermal shocks.
Do I need to use a special sealing when installing the sink, or is regular silicone enough?
Standard sanitary silicone sealant (transparent or white) is fully sufficient for installing a granite sink. It is important that it is suitable for kitchen environments (mold-resistant, with a label indicating "kitchen/bathroom"). It is applied to the lower edge of the sink before placing it into the cutout in the countertop. More about the installation technique can be found in the article How to correctly install a pop-up drain and overflow for a kitchen sink.
How to finally narrow down your choice – a checklist before ordering
Based on everything we have covered, here is a practical list of questions to consider before you click "Add to cart":
- What is my cabinet? Measure the internal dimensions of your cabinet and determine the maximum cutout you can make. This is covered in the article What size sink do I need – how to measure the cabinet and choose the right dimensions.
- One or two basins? How intensively do I cook? Do I have a dishwasher? Do I need a draining board?
- What is the water hardness in my area? For water hardness above 20°dH, avoid black color or be prepared for daily maintenance.
- What color matches my kitchen? Dark kitchen + dark sink = elegance, but demanding maintenance. Light kitchen + neutral tone = a more practical solution.
- Will I buy a set or separately? A set is a safer and more convenient choice for most customers.
- Have I been satisfied with the previous sink in this kitchen? If not, why? Was it too small? Too shallow? These are signals of what to change.
Conclusion – Alveus granite sink as a long-term investment
An Alveus granite sink is not the cheapest item in your kitchen – and it shouldn't be. It is an item that the whole household uses daily, that you touch hundreds of times a day, where you wash vegetables, dishes, pots, and cook. Choosing the right model and color can save you from daily frustrations caused by a wrong choice or from having to replace the sink after five years.
The hardness of the material ensures resistance to daily mechanical stress. The right color eliminates visual fatigue and unnecessary extra work. And when you add to that the monolithic construction without welds, the matte surface that hides itself well, and the proven European manufacturing – you get a product that will serve you calmly for twenty years, if used with common sense.
Take a look at the complete Alveus category on atria.sk and find the model that fits your kitchen perfectly – whether it's a compact sink for a studio apartment or a large double-basin set for a family kitchen full of daily cooking.
Do you have a question about this topic?
Having trouble deciding or dealing with a specific situation in your home? Write to us – we are happy to help.