melting is usually performed in the range of 1300-1450c depending on glass composition.Bulk bioglass can be fomed by casting or injection molding in graphite or steel molds. Annealing,conducted at 450-550c,is crucial because of the high coefficient of thermal expansion of these glasses. If a granulated or powdered material is required,the melt can be rapidly quenched in water or air before grinding and sieving into the desired particle size.bioglass is soft compared to other glasses. and final shapes can be easily made by machining. Diamond cutting tools are preferred for machining. Dry grinding is also possible.Bulk or particulate bioglass must be stored in dry conditions as it easily absorbs water and reacts with it.