Form This specification covers beryllium in the form of sheet and plate produced by hot rolling beryllium. Sheet Thickness 0.020 to 0.250 inch (0.51 to 6.35 mm)@ inclusive. Plate Thickness over 0.250 inch (6.35 mm). Application 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. Classification There are three sheet and plate classifications based on flatness tolerances (See 3.5.5). Safety - Hazardous Materials While the materials@ methods@ applications@ and processes described or referenced in this specification may involve the use of hazardous materials@ this specification does not address the hazards that may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved. WARNING Inhaling dust or fumes containing beryllium may cause chronic beryllium disease@ a serious chronic lung disease@ in some individuals. Over time@ lung disease can be fatal. Read the product specific Safety Data Sheet (SDS) for additional environmental@ health and safety information before working with beryllium or beryllium-containing materials.