Refrigeration and freezing
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BluRoX: Innovative vacuum perlite insulation

The future is circular

Our vacuum perlite technology is an innovation that will transform refrigeration and freezing. Introducing BluRoX. Instead of conventional polyurethane (PU) foam, this innovative technology uses a more effective form of cold insulation: a vacuum. Finely ground lava stone, known as perlite, stabilises the vacuumed components.

The basis: a revolutionary product design

Unlike the familiar vacuum insulation system with vacuum panels inside foam elements, the vacuum perlite technology in BluRoX appliances consists of a complete, stable 3D vacuum element.

Outer shell material

The outer casing is made of galvanized sheet metal, featuring a white lacquered exterior and a coated inner layer. These materials provide a sturdy structure for the appliance, support the white finish, and serve as the contact point for the door seal magnet.

10 years in the making – Meet some of the people behind the revolutionary freezer in our FNXa 522i film.

About EcoVadis

We use EcoVadis to quantify our progress in the areas of corporate responsibility and sustainability. Our commitment to a holistic corporate strategy has now been rewarded: The EcoVadis gold medal and our position in the top 3% of all the award-winning companies makes it clear that we are facing up to ecological, social and ethical challenges.

Learn more

Efficiency of vacuum insulation over time

Our refrigeration appliances should work energy-efficient as long as possible. Therefore we use only durable vacuum insulation panels which age very slowly. For example: Our patented BluRoX insulation technology or vacuum insulation panels made of silica.

*The thermal conductivity of the evacuated perlite in BluRoX is higher than that of other vacuum panels. However, since the entire device is constructed solely from vacuum insulation, the overall insulating effect of the device is better.

The thermal conductivity values were determined through long-term measurement series with various samples in Liebherr's laboratories.

Innovative BluRoX technology from Liebherr
benefits both people and the environment

Maximum energy efficiency

Instead of conventional foam elements, BluRoX uses a vacuum in combination with finely ground lava stone known as perlite. Energy-wise, a vacuum provides the best possible insulation. Due to its crystalline microstructure, perlite has a very low thermal conductivity. This combination of vacuum and perlite creates an incomparably energy-efficient and simultaneously compact solution for cold insulation.

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More volume

The highly effective BluRoX insulation means the walls can be a third less thick than on a conventional foam-insulated appliance. An appliance fully equipped with vacuum perlite technology has the same dimensions but around 25 % more capacity.

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Recyclable product design

Once a BluRoX appliance has reached the end of its service life, the raw material perlite can be removed and reused without the need for significant processing. Moreover, because the BluRoX insulation is not bonded to the surrounding components, the outer shell and inner container can also be easily processed and reused.

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Easy to repair

Because the vacuum perlite body does not have any integrated technical components, the compact refrigeration module (including its electronics) fits in the base of the BluRoX appliance as a replaceable unit.

This makes repairs even easier, faster and therefore more convenient for our customers.

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The FNXa 522i - The first Cradle to Cradle Certified® freezer

The Liebherr FNXa 522i freezer is coming and will be available from 2026. Born from volcanic rock and over a decade of innovation, is unique in the market. It unites all the benefits of our BluRoX technology, ensuring unmatched energy efficiency (Class A) and up to 30% more storage. The base cooling module cassette ensures easy maintenance. Its circular design allows each component to be reused, earning the Cradle to Cradle Certified® Bronze certification. Our freezer is built for the eco-conscious consumer and steps towards a future that is not linear – but circular.

More information about Cradle to Cradle

FNb 505i – our first freezer with BluRoX

BluRoX is already available – in the door of our FNb 505i freezer. The groundbreaking vacuum perlite technology offers an unprecedented and extremely efficient cold insulation. Thus, freezers can achieve top values in energy efficiency. In addition, the materials in the door can be sorted and reused at the end of their service life.

FNb 505i Prime NoFrost

Freestanding freezer with BluRoX door and NoFrost

  • Exterior dimensions: height/width/depth - 165.5 / 59.7 / 65.5 cm

  • Total volume - 238 l

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Made in Germany

Our superior products offer premium quality, cutting edge design, and innovative features that best fit your lifestyle. The use of high quality materials, perfectly detailed finishes, and elite cooling components are combined with the latest production processes, resulting in an outstanding cooling product.

Made in Germany

Our superior products offer premium quality, cutting edge design, and innovative features that best fit your lifestyle. The use of high quality materials, perfectly detailed finishes, and elite cooling components are combined with the latest production processes, resulting in an outstanding cooling product.

CO2 emissions (2022)

Scope 1:
Direct greenhouse gas emissions generated locally by the activities that an organisation owns or controls.1,428t CO2 eq.
Scope 2
Indirect greenhouse gas emissions resulting from purchased energy.0t CO2 eq.

Water consumption (2022)

Total annual withdrawal (2022)12,319 m³Third-party fresh water.
Total annual discharge (2022)11,683 m³Discharge to third-party (without onsite pre-treatment) - only applies to the water use for hygienic purposes (toilets, hand washing) and/or in kitchens.
Total annual consumption (2022)636 m³The water contained in the painting system* is cleaned, evaporated and put back into circulation. Fresh water needs to be added from time to time to compensate the evaporated water - the system operates without wastewater.

*The painting system is not part of the production process of all BlueRoX appliances -and will be phased out for all production processes at the complete production facility.
Water quantity by use cycle stage of BluRoX appliancesNo water consumption in manufacturing-processes of BluRoX appliances.
No water consumption in use stage.
Physical risk Ochsenhausen: (Baseline water stress)medium-high (20-40%)Reference: AQUEDUCT Water Risk Atlas

Materials

Materials used in refrigerators and freezers come into contact with food and must therefore meet specific criteria. At Liebherr, we ensure compliance with food safety standards.

We are committed to continuously increasing the proportion of recycled materials in the future.

Where do we stand?

Currently, we are unable to procure sufficient quantities of recycled materials for plastics and glass that meet these requirements. In the case of steel, the recycled content could not be reliably demonstrated by our suppliers.

Scope 1:
Direct greenhouse gas emissions generated locally by the activities that an organisation owns or controls.1,428t CO2 eq.

Scope 2:
Indirect greenhouse gas emissions resulting from purchased energy.0t CO2 eq.
Total annual withdrawal (2022)12,319 m³Third-party fresh water.
Total annual discharge (2022)11,683 m³Discharge to third-party (without onsite pre-treatment) - only applies to the water use for hygienic purposes (toilets, hand washing) and/or in kitchens.
Total annual consumption (2022)636 m³The water contained in the painting system* is cleaned, evaporated and put back into circulation. Fresh water needs to be added from time to time to compensate the evaporated water - the system operates without wastewater.

*The painting system is not part of the production process of all BlueRoX appliances -and will be phased out for all production processes at the complete production facility.
Water quantity by use cycle stage of BluRoX appliancesNo water consumption in manufacturing-processes of BluRoX appliances.
No water consumption in use stage.
Physical risk Ochsenhausen: (Baseline water stress)medium-high (20-40%)Reference: AQUEDUCT Water Risk Atlas

Materials

Materials used in refrigerators and freezers come into contact with food and must therefore meet specific criteria. At Liebherr, we ensure compliance with food safety standards.

We are committed to continuously increasing the proportion of recycled materials in the future.

Where do we stand?

Currently, we are unable to procure sufficient quantities of recycled materials for plastics and glass that meet these requirements. In the case of steel, the recycled content could not be reliably demonstrated by our suppliers.

Circular by design

Efficient. Recyclable. Repairable. From the outset the FNXa 522i was designed to follow circular economy principles. Each essential component of the freezer can be reused, earning it the industry leading Cradle to Cradle Certified® certification in bronze for circular economy.

More volume

30% more volume, same size. The BluRoX insulation technology allows for thinner walls, resulting in more internal storage capacity without increasing the appliance's external dimensions. In the case of the FNXa 522i it’s approximately 30% more volume.

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Easier repairability

Cooling module in base. The cooling module of the FNXa 522i is located in the base and can be easily removed, allowing for quick repairs or replacements.

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Highest energy efficiency

Unrivalled energy efficiency. An appliances energy consumption over its lifespan is the biggest factor when it comes to sustainability. Thanks to our BluRoX technology, we are able to provide top energy efficiency class A.

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The Cradle to Cradle Certified® Certification

Cradle to Cradle Certified® is a prestigious certification standard for products designed for the circular economy. It evaluates products in 
five areas: material health, material reutilisation, renewable energy, water stewardship, and social fairness. Products are rated for their commitment to sustainability and continuous improvement.