Lightweight fillers

Our lightweight filler ‘Stiff’ consists of hollow microspheres that consist largely of silicon dioxide and aluminium dioxide. These hollow microspheres are characterised by a particularly low density and high melting temperatures. Their chemical composition also makes them inert, water resistant and non-toxic.

Pros and cons
Lightweight fillers Properties


  • High bonding strength
  • Density reduction and lower weight of the end products
  • Reduced binder requirement
  • Enhanced flow properties
  • Better heat and sound insulation
  • Improved mechanical parameters
  • Increased chemical resistance
  • Temperature-resistant
  • Low water absorption
  • High degree of hardness


  • Uneven grain size

Lightweight fillers
Manufacturing process

Hollow microspheres are produced during the combustion of coal in thermal power plants. At temperatures of 1500–1750 °C, combustion causes the particles to form in the fly ash.

Lightweight fillers Programme

Fibre Filler



Order our Lightweight fillers Sample box

Contact our fibre experts and discover our extensive STW sample box with numerous raw material samples, personally tailored to your needs and requirements.

Order Lightweight fillers sample box

technology and
quality of the fibre

State-of-the-art laboratory facilities, quality management according to ISO 9001:2015, energy management according to ISO 50001:2018 and last but not least the high demands on our own work ensure the high quality standards of our Lightweight fillers. See for yourself.

If you want to know more about the technology and quality of our Lightweight fillers If you want to know, just get in touch with us. We would be happy to advise you comprehensively and help you with our know-how.

You are looking for the perfect Lightweight fillers for your application or have an exact requirement profile, which the used Lightweight fillers must fulfill?

Then you are exactly right, as a technology leader in the field of fibre development and production, we offer you individual solutions and manufacturing processes that ensure constant and reproducible fibre quality.



Concrete, Shotcrete, Cement
Fire Protection Applications
Paints, Coatings
Plasters (Base, Exterior, Interior)
Putty, Filler, Reinforcing Fillers
Levelling Compound, Self-Levelling Compounds, Floor Coatings
Tile Adhesive
Liquid Wallpaper
Marine Coating
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