Knauf Insulation is a leading European manufacturer of chimney insulation and supplier to some of the world’s largest chimney producers. Our strategy and partnership with our customers is based on continuous, innovative product development, in order to deliver premium solutions with proven expertise.

Our latest innovative chimney insulation product are supreme granulated rock mineral wool fibres – CHM S FLOCKS – specially designed to provide excellent thermal and fire insulation of double-wall stainless steel chimney systems.

CHM S FLOCKS are bio-solublerock mineral wool flocks made of virgin, binder-free rock mineral wool.

Completely natural and highly sustainable, CHM S FLOCKS represent the perfect solution for thermal and fire insulation of double-wall stainless steel chimneys, due to their:

  • supreme fire protection
  • supreme thermal insulation properties
  • excellent stability at high temperatures
  • high material flow in chimney insulation processes

HOW IT WORKS – insulating double-wall stainless steel chimneys

HOW IT WORKS – insulating double-wall stainless steel chimneys
  1. CHM S FLOCKS are produced by grinding layers of rock mineral wool into smaller particles. Our production process is fully automated, ensuring consistent, premium product quality. In order to provide optimal service for our customers different flock sizes are available. Packaging in compressed bags on pallets proves a highly efficient storage and transport solution.
  2. In the blowing machine, flocks are fed to the hopper. The feeder transfers flocks to the shredder, while the stream generated by the blower conveys the insulation to the outlet at high speed (air flow and insulation flow can be adjusted).
  3. In the closed cabinet, ensuring dust retention, flocks are blown into the cavity – the hollow space between the inner and outer wall of the stainless steel chimney pipe, to form an efficient insulation layer. Installation is fast and simple and above all, independent of chimney pipe diameter. Chimney producers require only a single insulation product – CHM SFLOCKS – for all chimney pipe diameters.


  • TIME EFFICIENCY – fast and simple installation : Filling of the chimney tubes with CHM S FLOCKS is fast and simple, regardless of chimney diameter.
  • PRODUCTION EFFICIENCY – one product for all diameters: When using standard pipe section insulation, every product needs to be adjusted to each chimney diameter, while insulating special chimney accessories is very time consuming. When using Knauf Insulation CHM S FLOCKS, however, one product is sufficient for insulating chimneys of any diameter, greatly simplifying stocking requirements and the production and installation processes. Our advanced production process enables fast response-time to all your supply requirements
  • TRANSPORTATION AND STORAGE EFFICIENCY: CHM S FLOCKS are packed in compressed bags on pallets, providing an efficient storage and transport solution. CHM S FLOCKS require 50% less storage spacecompared to pipe sections.
  • QUALITY WITHOUT COMPROMISE: Knauf Insulation CHM S FLOCKS meet all standard requirements for the insulation of stainless steel chimney systems and comply with both RAL and EUCEB standards. Superior characteristics like excellent fire protection and stability at high temperatures, melting points above 1,000˚C, high thermal insulation properties and high sustainability define it as a premium quality solution.

Knauf Insulation CHM S FLOCKS provide efficiency where it really matters, quality without compromise, and serve to innovate your production – welcome to the future of chimney insulation.

For more information see our product folder here or contact:

Borut Vezočnik
Head of Products and Applications OEM Europe & CIS
Tel: +386 4 5114 132 
Mobile: +386 31 651 124

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Illange (FR) rock mineral wool plant

Knauf Insulation's new plant in France opens for business

The new site, which meets the highest standards of sustainable best practice and has created 123 new jobs, will provide an estimated annual economic benefit to the region of €20 million and produce 110,000 tonnes of Rock Mineral Wool every year — enough insulation to renovate 25,000 homes a year.

Jean-Claude Carlin, Group CEO of Knauf Insulation said: “Demand for our rock mineral wool solutions is increasing significantly across Europe and particularly in France where there is a commitment to renovate 500,000 homes every year to tackle fuel poverty, slash energy use and reduce the country’s carbon footprint and stringent new regulations for fire safety.”

“We are looking forward to being able to introduce our new range of solutions to our customers. The new plant will also reduce our carbon footprint and help to recalibrate our production from our facilities in Central and Eastern Europe, significantly improving our customer service levels”.  

Environmental commitment

Mark Leverton, Knauf Insulation’s Managing Director Western Europe, said: “From the outset we announced our ambition to create a reference plant for our group, not only in terms of our innovations but also in terms of our approach to the environment and the wellbeing of our new colleagues.”

The plant is in the process of being certified by the independent sustainable auditing schemes HQE and OsmoZ and Knauf Insulation is working with local environmental association AICINI to transform 7.5 hectares of the site into a wild meadow for plants, birds and insects. A 3,500m2 Urbanscape Green Roof has also been installed across the plant buildings.

Economic benefits

Mark said: “In addition to the 123 new jobs at the plant, we expect to create between 300 and 400 indirect jobs through contractors and local services.”

“The €110 million investment has put the plant in the top 10 of investments in France this year and has directly benefited the region with local businesses carrying out the majority of the work. We estimate the annual indirect impact on the eastern Moselle region will be around €20 million a year.”

Power of people

The majority of the new employees are from the local region. The plant also hosts the largest number of female operators and engineers in the group. Ages of the new employees range from 19 to 57 and all offer a variety of experience.

Alain Rysman, Plant Manager said: “The Moselle region has a long history of industrial excellence so finding skilled people has not been a challenge. The region has been impacted by economic challenges and unemployment over the last couple of decades so there has been an enormous amount of interest in the project. This site shows that an industrial region can rebound and offer more than factory closures.”


Knauf Insulation the recipient of grant in scope of public tender

Knauf Insulation the recipient of grant in scope of public tender by Ministry for Economic Development and Technology in Slovenia, “Incentives for Research and Development Projects 2”

The objective of the public tender is to promote research, development and innovation activities in companies and consortia in the field of innovative R&D projects aiming to develop new or improved products, processes or services in the priority areas of Slovenia’s Smart Specialization Strategy.

Competing project: Development of sustainable, energy-efficient and high-tech insulation materials for food preparation systems – VIIM (collaboration of Knauf Insulation, d.o.o., Škofja Loka, and FPM Černigoj d.o.o., Ajdovščina)

Primary objective of competing RRI project:

  • Innovative product development – energy-efficient needle punched felt produced from natural mineral fibres for kitchen ovens that will help kitchen oven producers in the manufacturing of energy class A ovens under the new Commission Regulation (EU) No. 66/2014, and available to the market at a competitive price. Furthermore, the new material will constitute a high added value for us as the producer (i.e. energy efficiency, low material costs and eco-friendly production).

  • The product will exhibit the following characteristics:

    • Volumetric weight of insulation material: 50–150kg/m3

    • Specific heat capacity (Cp): 0.84kJ/kg.K

    • Thermal conductivity (λ) at high temperatures: <0.06W/m.K

The newly developed material/innovation will improve and strengthen our position in the kitchen oven insulation material production sector.

Total grant awarded: €493,204.42


The investment is financed by the Republic of Slovenia and the European Union from the European Regional Development Fund.

More information on the European cohesion policy in Slovenia available at


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