ISO 18907 pdf download Imaging materials — Photographic films and papers — Wedge test for brittleness Scope This InternationalStandard specifies a method for determiningand expressingquantitativelythe brittlenessof photographic film and papers. lt does not, however, specify a universal britleness test for all types ofstress encountered for which special tests can be required to correctly rate the material for brittleness. The method...