PN C45301-04-1993 Caprolactam Method of test Determination of colour of 50% a?ueous caprolactam solution, expressed in Ha-zen units Spectrometric method
1993PN C45301-04-1993 Caprolactam Method of test Determination of colour of 50% a?ueous caprolactam solution, expressed in Ha-zen units Spectrometric method