Working together for a sustainable world


Gülermak Heavy Industries Construction & Contracting Co. Inc. is a sixty-year-old company active in construction and contracting of industrial, infrastructure and transportation projects. Gülermak is a leading steel fabricator in Turkey, serving diverse clients in more than 30 countries. Gülermak identifies sustainability as a core challenge of the future and is proud to invest in Sustonable. Gülermak brings its manufacturing expertise to a company committed to contributing to a more sustainable future.

Shibumi International, a wholly owned subsidiary of Gulermak, focuses on innovative projects in the built environment such as construction, facilities management, building inspection, and innovative solutions to urban life. At its core, Shibumi is dedicated to helping Gülermak diversify as the company evolves beyond its 60th year.

Dekker Zevenhuizen is the market leader in the Netherlands when it comes to custom countertops and one of the world’s most innovative companies in this industry. This more than eighty year-old family company realized the potential of our new sheet material at an early stage and thus decided to invest in the development of Sustonable.

HighTechXL is an accelerator programme for start-ups in the high tech industry and is based on the High Tech Campus in Eindhoven, the Netherlands. Our participation to this programme resulted in multiple investments at the start of 2017, which allowed us to continue financing the development of Sustonable.

SUEZ is a global player that offers innovative and sustainable solutions for waste and raw materials, energy, water and the environment. In the Netherlands, SUEZ collects the waste from 530,000 households and 80,000 companies and institutions. SUEZ makes raw materials for new products in close cooperation with customers and partners. For the pilot, SUEZ supplies recycled PET from household waste.