Expanded granulated cork for thermal and acoustic insulation 3-15mm - 250l (0,25m3) - 18kg

We offer four fractions: 2–4 mm, 2–9 mm, 4–8 mm, and 3–15 mm.

It’s a “crushed” form of expanded cork – a lightweight, natural material with even better insulating properties than standard cork.

Expanded cork is made from natural cork (the bark of the cork oak tree) that has been exposed to high temperatures. During this process, the cork begins to expand and takes on a deep brown colour. No chemicals are added during heating – the entire process is 100% natural. Cork contains a substance called suberin, which acts as a natural adhesive and is released when the cork is heated.

Most commonly, they’re used in construction applications, such as:

• insulating attics, walls, floors, and ceilings – especially in hard-to-reach areas,
• filling cavity walls, thermal insulation partitions, and hollow walls,
• pitched roofs – as loose-fill insulation between rafters,
• cavities and underfloor voids,
• levelling out gaps and uneven surfaces in floors and ceilings,
• dry screeds,
• lightweight flooring systems.

Expanded cork granules also have various non-construction uses, including:

• terrariums – as a safe, natural substrate for reptiles and other exotic animals,
• gardens – as an alternative to pine bark, suitable under plants or as decorative mulch,
• film productions – to imitate rubble or soil in special effects (e.g. explosions or collapses),
• model-making – perfect for architectural models and dioramas.

First and foremost, it provides very good insulation – both thermal and acoustic. In fact, its insulating performance surpasses that of standard cork.

Other benefits include:

• Lightweight – it doesn’t add unnecessary load to the structure,
• Resistant to mould, fungi, and pests,
• Chemically inert,
• Dimensionally stable – retains its shape and size over time,
• Long-lasting – maintains its properties for many years,
• Natural and biodegradable,
• Unaffected by extreme temperatures, withstanding a range from –180°C to +120°C without losing its integrity,
• Fire classification Euroclass E – it doesn’t release toxic fumes when exposed to flames.

Yes, the product holds a Polish hygienic certificate issued by the National Institute of Public Health, confirming that the granules are non-allergenic, non-irritating, and free from any side effects. At present, we are the only company in Poland to have received this certification.

Absolutely – natural cork is one of the most environmentally friendly materials available. It’s harvested from the bark of the cork oak tree, which doesn’t require cutting the tree down. The bark naturally regenerates every 9 to 12 years, allowing it to be harvested repeatedly without harming the tree or the ecosystem. Cork oaks are long-living trees – some can live for over 200 years.

What’s more, cork has a negative carbon footprint. Cork oak trees absorb up to four times more CO₂ than other types of trees!

Expanded cork granules offer long-lasting insulation – they can retain their properties for up to 50 years.

It’s dark brown – a result of heating the cork at high temperatures. It isn’t dyed or painted. Compared to classic light beige cork, expanded cork has a more raw appearance.

For the 2–9 mm fraction, the density is approximately 70–80 kg per cubic metre.

Yes, we also offer expanded cork in sheet form.

Cork performs significantly better overall. Foam is a synthetic material that tends to degrade over time – it can settle, lose its airtightness, or break down. Its production also comes with a high carbon footprint.

Cork, on the other hand:

• Doesn’t age as quickly as foam,
• Is natural, non-toxic and safe – for people, animals, and the environment,
• Is resistant to mould, insects, and fungi,
• Has a negative carbon balance and is 100% biodegradable.

The best way to store them is in a dry, well-ventilated space. Avoid keeping them in damp basements, under tarpaulins outdoors, or in non-breathable bags. It’s also important to ensure they’re not exposed to direct sunlight or heat sources.

In short: keep them dry, airy, and away from radiators and sunlight.