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DS DSEN 61249-2-5Corr 2006-MAR-01 Materals for prnted boards and other nterconnectng structures - Part 2-5 Renforced base materals clad and unclad - Bromnated epoxde cellulose paper renforced corewoven E-glass renforced surfaces lamnated sheets of defned flammablty vertcal burnng test copper-clad