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Fillers & Crushed Sands will revolutionize the market.

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36167 Nüsttal
Best.-Nr.: 6450
36115 Ehrenberg/Rhön
Best.-Nr.: 6449
37412 Herzberg am Harz
Best.-Nr.: 6440
38667 Bad Harzburg
Best.-Nr.: 6419
56299 Ochtendung
Best.-Nr.: 6418
59929 Brilon
Best.-Nr.: 6414
59955 Winterberg
Best.-Nr.: 6413
Pilawa Górna
58-240 Pilawa Górna, Polen
Best.-Nr.: 6409
37139 Adelebsen
Best.-Nr.: 6389
67292 Kirchheimbolanden
Best.-Nr.: 6377
59872 Meschede
Best.-Nr.: 6367
58540 Meinerzhagen
Best.-Nr.: 6366
66839 Schmelz
Best.-Nr.: 6320
07343 Wurzbach
Best.-Nr.: 6315
86633 Neuburg
Best.-Nr.: 6314
99755 Ellrich
Best.-Nr.: 6274
Neu-Bamberg Brechsand
55546 Neu-Bamberg
Best.-Nr.: 6225
Neu-Bamberg Füller
55546 Neu-Bamberg
Best.-Nr.: 6224
55490 Henau
Best.-Nr.: 6219
96515 Sonneberg
Best.-Nr.: 5049


Rock dust/fillers and crushed sands are quartz-poor tempers and drying agents that are added to brick masses. Improved sintering behaviour above 950 °C can strongly increase the body strength. Ideally, rock dust is wetted before transportation and processing in the brick plant.

The maximal grain size of rock fillers is d < 0,6 mm. Therefore the raw material does not have to be further processed to be used in the brick industry. At the same time the Winkler triangle shows, that the grain size of problematic masses can be influenced to increase the amount of support grains.

Graphical representation of filler and crushed sand grain size distribution according WINKLER (1954) & STEIN (1982)
Graphical representation of filler and crushed sand grain size distribution according WINKLER (1954) & STEIN (1982)

Rock fillers are dust-dry mineral products that are produced in large quantities during the dry processing of solid rock. Many quarries invest in equipment for controlled wetting of rock dust. Crushed sands contain bigger grains up to 2 mm. Depending on the brick raw material rock dusts and crushed sands can be used with a share of up to 20 %.

Extraction of phyllite / Poland (2014)
Homogenous wetting of phyllite filler / Poland (2014)
Mixing of greywacke filler and filter cake / Sauerland (2018)

The mineralogical characteristic of rock fillers is determined by the type of solid source rock. Magmatic rocks and fillers with high contents of feldspar and phyllosilicates are very common. Rock fillers can be used to optimize the drying and firing process. Resulting firing colours vary between light cream, grey and red to dark brown.