Materials for printed boards and other interconnecting structures. Reinforced base materials, clad and unclad. Brominated epoxide cellulose paper reinforced core/woven E-glass reinforced surfaces laminated sheets of defined flammability (vertical burning test), copper-clad|Printed-circuit boards, Printed circuits, Printed-circuit bases, Coated materials, Reinforced materials, Specification (approval), Paper, Epoxides, Epoxy resins, Glass fibres, Sheet materials, Laminates, Fire-resistant materials, Flammability, Copper, Foil