The present disclosure provides novel bone matrix (BM) materials, and methods for preparation and use of the demineralized bone matrix materials and compositions therefrom. The methods of preparation include the use of a closed-vessel demineralization system, as well as simple, easily reproducible process steps, and significantly shortened times for demineralization. These novel BM materials do not require the inclusion of carriers and/or delivery agents, or the addition of binders, and can be made in various forms, including a clay, putty, crush, powder, or gel. The novel BM compositions and methods disclosed herein may, illustratively, have applications in the medical field, such as in surgical bone graft applications, in the repair and/or regeneration of bone and bone-related tissue, and the like.