Current generation gravitational wave detectors rely on ultra-high purity fused silica in the final monolithic stage of the mirror suspension systems for their excellent thermal noise performance. There is however a push to develop cryogenic suspension systems for the next generation detectors, where fused silica loses its superior thermal noise properties. Silicon is an attractive candidate material, and is the baseline design selected for use in the cryogenic Einstein Telescope and brings with it a new set of challenges. This paper outlines what the authors believe to be the world’s first demonstration of a single ribbon hydroxy-catalysis bonded silicon suspension that has cycled between room temperature and a 4 K environment. Also discussed is the characterisation of similar silicon ribbon, detailing work on surface treatments used to improve the ultimate tensile strength alongside the thermal conductivity of the silicon suspension
