This standard ( Part 8 ) prescribes the method for determining the resistance of upper material of polyvinyl chloride boots when subjected to repeated flexing or bending under specific conditions and for known periods on flexing machine.
IS 12240 Pt.8-1988 history
1988IS 12240 Pt.8-1988 Test methods for polyvinyl chloride boots Part 8 Bending resistance of polyvinyl chloride upper materials