This Standard 61249-2-2 gives requirements for properties of phenolic cellulose paper reinforced copper-clad laminated sheets of high electrical grade in thicknesses of 0,8 up to 3,2 mm. This standard covers materials with different requirements on flammability and they are designated according to the following: EN 61249-2-2-1 General purpose grade. Requirement on flammability not specified. EN 61249-2-2-2 Material of defined flammability. (Horizontal burning test). EN 61249-2-2-3 Material of defined flammability. (Vertical burning test). This grade of materials is provided for one of two flammability requirements as designated FV0 or FV1 as shown in Table 9. Some property requirements may have several classes of performance. The class desired must be specified on the purchase order, otherwise the default class of material may be supplied.