Major violations either produced in three grades with a minimum size of 0.5 m2. Thin in thickness from 1.5 to 3 cm and regular in thickness from 3 to 5 cm and vehicular of thickness 5.7 cm.
Extra large break rather than 1 m2 6 to 14 cm thick. Thin loaded cast, ordinary, run strong and extra large laid in sand. These are primarily uteprodukter.