This specification covers beryllium in the form of sheet and plate produced by hot rolling beryllium block. Sheet: thickness 0.020 to 0.250 inch (0.51 to 6.35 mm), inclusive. Plate: thickness over 0.250 inch (6.35 mm). These products have been used typically for parts requiring high strength-to-weight ratio and high modulus of elasticity, but usage is not limited to such applications.