90.93 Standard confirmed Jun 7, 2023
ISO
ISO/TC 61/SC 5 Physical-chemical properties
International Standard
83.080.01 Plastics in general
This document describes a high-performance liquid chromatography (HPLC) method for determining the concentrations of cyclic oligomers of caprolactam, from 0,01 % by mass upwards, and linear oligomers of caprolactam, from 5 mg/kg upwards, both up to and including the hexamer of caprolactam (n = 6), in samples of polyamide 6, caprolactam and mixtures of rearrangement products in water.
A second, significantly faster, HPLC method is included for determination of caprolactam and its cyclic dimer, based on the same principle and using the same equipment as the first method.
WITHDRAWN
ISO 15033:2007
PUBLISHED
ISO 15033:2018
90.93
Standard confirmed
Jun 7, 2023