Tradition and progress
express our dynamic

Maintaining the established and creating something new
we have merged:

We, the companies Siebeck-Bitter GmbH and Dibau GmbH have merged and now operate under the name of Siebeck GmbH.
Together we are even stronger in supporting you in future challenges.

The name Siebeck-Bitter GmbH means a mid-sized company, family-owned since 1896, with a profound level of professional experience. The core competency of Siebeck-Bitter is the design, manufacturing and distribution of industrial valves for worldwide application at highest quality standards.

The valves are applied for mining, machines and plant construction, road, rail and tank vehicles as well as for the chemical industry. In addition to regular standards, the designing will also be acc. to medium specific respectively user specific standards. Professional expertise, flexibility, reliability, 100 % inspection prior to delivery, well thought-out special design and utmost importance to quality management characterize this company.


The name Dibau stands for a broad performance spectrum especially in the fields of glass sealant, building and connection joint and for the leading distributor and business partner of the innovative, global market leader Dow Corning®.

You can supply processing materials and processing equipment. The product range also includes cleaners and primers, acrylates, PU-foams, adhesives, high-quality insect screening systems for windows and doors, accessories for roller shutters, porches, ready-to-use roller shutter, roller shutter motor, accessories and machinery of Makita®. A comprehensive, high quality range, intensive and competent consultation and service as well as professional handling and flexibility characterize this company.

Please visit us in our company or arrange an appointment with us on your site. We will be glad to support you in any matter!

Thank you very much for your interest, we look forward to a good and successful cooperation!