Neuburg Siliceous Earth Suppliers


We are the UK and Eire distributor for neuburg siliceous earth; a unique performance filler produced by Hoffmann Mineral GmbH

Neuburg siliceous earth is marketed under the trade names Sillitin and Sillikolloid; a natural agglomerate of corpuscular silica and lamellar kaolinite produced from mineral deposits formed 95 million years ago.

When it is used as a filler its unique particle structure offers a range of application advantages

Advantages of using neuburg siliceous earth

  • Rapid incorporation
  • No filler agglomeration
  • Excellent dispersion
  • Excellent scratch resistance in plastics, paints and varnishes
  • Low abrasivity

Typical applications for neuburg siliceous earth

Elastomers – profile extrusion, roller coverings, cable insulation and sheathing

Surface Coatings – electrophoretic paints

Polishes – car polishes, metal polishes


Aktisil Grades

Aktisil is the trade name for surface treated grades of neuburg siliceous earth, used for applications where optimum physical properties are required. With the exception of Aktisil MAM (based on Sillitin V88) and Aktisil MAM-R (based on Sillitin V85), all grades of Aktisil are based on Sillitin Z86.

Aktisil Selection Chart


Silfit Z91 is a naturally occurring conglomerate of amorphous and crypto-crystalline silica with lamellar kaolinite, which has been subjected to heat treatment.  The components and the thermal process lead to a calcined product that offers special performance benefits as a functional filler.


Sillitin Puriss Grades

The Puriss grades of neuburg siliceous earth are produced by a downstream process which further reduces the already low sieve residue.  They are the first choice when optimum dispersion properties are needed.

Sillitin Puriss Selection Chart

Sillitin Product Selection Chart

Further information and guide formulations can be found on the Hoffmann Mineral GmbH website