DIN EN ISO 1833-18:2011 Textiles - Quantitative chemical analysis - Part 18: Mixtures of silk and wool or hair (method using sulfuric acid) (ISO 1833-18:2006); German version EN ISO 1833-18:2010
2021DIN EN ISO 1833-18:2021 Textiles - Quantitative chemical analysis - Part 18: Mixtures of silk with wool or other animal hair (method using sulfuric acid) (ISO 1833-18:2020); German version EN ISO 1833-18:2020
2011DIN EN ISO 1833-18:2011 Textiles - Quantitative chemical analysis - Part 18: Mixtures of silk and wool or hair (method using sulfuric acid) (ISO 1833-18:2006); German version EN ISO 1833-18:2010