Hydrophober Zuschlag mit waterproof technology from Evonik
Waterproof technology from ROTEC®

The high-tech hydrophobic aggregate ROTOCELL PLUS®

DIN ISO 9001 certified
Certified ISO 9001

Assurance and transparency



Since the 1990s ROTEC® is a leading manufacturer of environmentally-friendly lightweight aggregates with an annual production exceeding 180,000 tons.

ROTEC® promotes, improves and sells this ecologically excellent raw material worldwide.

The "young company" is built on the strong foundation of its shareholders, KANN GmbH & Co. KG with headquarters in D-56170 Bendorf, one of the largest building materials supplier of the Federal Republic, as well as, Dr. Carl Riffer Baustoffwerke GmbH & Co. KG with headquarters in D-56218 Mülheim-Kärlich.

Seit dem 01.01.2019 ist die Fa. Dr. Carl Riffer alleiniger Gesellschafter und setzt den erfolgreichen Werdegang von ROTEC® innovativ und zukunftsorientiert fort.


Dr. Carl Riffer Baustoffwerke