SigmaRoc plc announced that in conjunction with the conditional acquisition of Stone, Jacques Emsens has agreed to join the board of SigmaRoc as a Non-Executive Director. Mr. Emsens helped build SCR-Sibelco N.V. (Sibelco) into a world leading materials solutions company. Mr. Emsens is expected to join the Board in the coming months, following the completion of the acquisition of Stone and customary director due diligence.