Who we are

Wilhelm Siefer GmbH & Co. KG is one of the world’s leading companies in wet size-reduction technology. Our Trigonal® machines are used in many industrial sectors worldwide and offer solutions for wet size-reduction tasks of all kinds.

Our success is the combined result of experience, expertise and innovation

We are convinced that a company that focuses on its strengths will always be the one that is successful. Our Trigonal® machines are our strength! They employ a simple operating principle: wet size reduction and other kinds of processing of several materials, of which at least one is in a liquid state. And this is done at the highest technical level. That is why Siefer stands for long-lasting products that do their job reliably – in countless cases for decades.