This standard specifies non-fibers in two fiber blends consisting of protein fibers and non-protein fibers as follows:
KS K ISO 1833-4:2009 history
2023KS K ISO 1833-4-2023 Textiles — Quantitative chemical analysis — Part 4: Mixtures of certain protein fibres with certain other fibres (method using hypochlorite)
2018KS K ISO 1833-4:2018 Textiles — Quantitative chemical analysis — Part 4: Mixtures of certain protein fibres with certain other fibres(method using hypochlorite)
2009KS K ISO 1833-4:2009 Textiles-Quantitative chemical analysis-Part 4:Mixtures of certain protein and certain other fibers(method using hypochlorite)