Do epoxy bow tabs break?

No. Epoxy resin is a general term for a class of polymers that contain more than two epoxy groups in the molecule. It is the epichlorohydrin and bisphenol A or polyol polycondensation product. Due to the chemical activity of the epoxy group, available in a variety of compounds containing active hydrogen to make it open the ring, curing crosslinking to generate a mesh structure, so it is a thermosetting resin, harder than a stone, so epoxy resin bow piece is not broken.