A lot has yet to be explored in the field of polymer and material chemistry for an efficient usage of BSG, and this review will help outlining the opportunities and challenges for the valorisation of BSG through the prism of biomass fractionation for polymer and composite material applications, which were not reviewed to this date. This review will consider articles treating BSG's matrix fractionation and other biomasses for comparison and publications focusing on monomer production from BSG for polymer synthesis as well as the use of BSG for composite materials.