Ytong is one of the world’s oldest and best known building material brands and is synonymous with autoclaved aerated concrete. Ytong building blocks have been manufactured industrially for over 85 years. Throughout the decades we have continually improved their quality and characteristics. Today, Ytong stands for highly efficient thermal insulation, optimum fire protection, excellent load-bearing abilities and easy recycling.

Picture: Ytong

Aerated autoclaved concrete is primarily composed of the mineral natural materials lime, sand, cement, and water. Manufacturing the block requires low consumption of primary energy and its efficient resource balance is equally impressive: One cubic meter of raw material is sufficient to produce five cubic meters of autoclaved aerated concrete. From production of the raw materials through manufacture and use, right up to material recycling following the demolition of buildings – it is possible to achieve a closed raw material loop for Ytong blocks. The environmental product declaration on the basis of the international ISO 14025 standard confirms that the block is free of harmful substances, does not release any emissions that are harmful to health and exhibits an excellent eco balance.

A balanced indoor climate

Despite its low weight, Ytong autoclaved aerated concrete exhibits high strength with a corresponding load bearing capacity. The millions of air entrainments within the block give it one of the best thermal insulation values for solid building materials. This allows energy-saving exterior walls to be built without additional thermal insulation. The Ytong building block ensures an optimum relationship between temperature and air humidity. Thanks to its purely mineral structure, autoclaved aerated concrete is guaranteed to be non-flammable, completely free of harmful substances and therefore provides the highest level of fire protection and safety.

Picture: House
Modern architecture in Bratislava, Slovakia: Ytong is perfectly suited for sophisticated structures built of natural materials

As the only manufacturer of autoclaved aerated concrete, Ytong provides the market with blocks that have a lambda value of 0.07 W/(mK). This means that single-shell walls with a thickness of 36.5 cm already meet the energy standard of a KfW Efficiency House 55 even without additional thermal insulation. In addition to the classic Ytong building block, Xella offers a further block with above average thermal insulating properties: The Ytong Energy+. A house constructed with Energy+ blocks only consumes one liter of heating oil per square meter of exterior wall over a single heating season. The 40 cm thick Ytong Energy+ block achieves a U-value of 0.15 W/(m2K), thereby achieving the passive house standard without the need for additional insulation. All Ytong products are fully recyclable.

Where the Y in Ytong came from

Energy and raw material shortages following World War I prompted the Swedish government to raise the reference values for thermal insulation. Lower energy consumption would make the country less dependent on imports. The breakthrough came in 1923 with the development of autoclaved aerated concrete. Six years later autoclaved aerated concrete was produced on an industrial scale for the first time in the southern Swedish town of Yxhult. A little later the original name, “Yxhults Anghärdade Gasbetong” became the world’s first registered trademark for a building material. It was marketed globally under the brand name Ytong – and changed the construction industry sustainably.

Ytong Energy+

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Ytong Energy+ possesses one of
the best insulation values for building materials, with a lambda value of 0.065 W/(mK).



5 m3 of building materials are created from 1 m3 of raw materials.