ISO 1833-17:2019

Overview

ISO 1833-17:2019 is an international standard developed by ISO that specifies a quantitative chemical analysis method for textiles. This method focuses on determining the mass percentage of chlorofibres and certain other fibres in mixtures that include cellulose fibres (such as cotton and viscose) and additional synthetic fibres. The technique uses concentrated sulfuric acid to dissolve specific fibres, allowing for accurate and reliable measurement of fibre composition in complex textile blends.

This standard is particularly useful when chlorofibres do not fully dissolve in solvents like dimethylformamide or carbon disulfide/acetone mixtures, offering an alternative to the methods described in ISO 1833-12 and ISO 1833-13.

Key Topics

• Scope and Application
  ISO 1833-17 applies to textiles containing blends of:

  • Cellulose fibres: cotton, viscose, cupro, modal, lyocell
  • Synthetic fibres: acetate, triacetate, polyamide, polyester, elastomultiester, certain acrylic and modacrylic fibres
  • Additional components: chlorofibres (based on vinyl chloride homopolymers), polypropylene, elastolefin, melamine, and polypropylene/polyamide bicomponent fibres.

• Analytical Principle
  The method relies on dissolving fibres susceptible to concentrated sulfuric acid from a dehydrated textile sample. The residue after dissolution-consisting primarily of chlorofibres and specific synthetic fibres-is filtered, washed, dried, and weighed. The percentage of fibres dissolved is calculated by difference, enabling quantitative determination of the fibre blend.

• Reagents and Materials

  • Concentrated sulfuric acid (ρ = 1.84 g/ml at 20 °C)
  • Diluted sulfuric acid solution (50%)
  • Diluted ammonia solution for washing steps

• Test Procedure
  The textile sample is treated with sulfuric acid in a conical flask, allowed to react at room temperature, and occasionally stirred. After acid treatment, the liquid containing dissolved fibres is decanted, and the residue is thoroughly washed with specified solutions to remove acid traces before drying and weighing.

• Accuracy and Reliability
  The method offers a confidence limit of ±1 percentage point (at 95% confidence level) on homogeneous textile mixtures, ensuring dependable analytical results suitable for quality control and compliance testing.

Applications

• Quality Control in Textile Manufacturing
  Enables manufacturers and laboratories to verify fibre compositions in blended textiles, ensuring conformity with product specifications and regulatory requirements.

• Material Authentication and Verification
  Supports authentication of blends containing chlorofibres and related synthetic materials, important for verifying labelling claims and detecting counterfeit or substandard products.

• Research and Development
  Utilized by R&D teams in the textile industry to analyze fibre blends for developing new materials and optimizing textile formulations involving cellulose and chlorofibre mixtures.

• Regulatory Compliance
  Helps manufacturers meet international standards and consumer protection laws by providing a standardized method for fibre content quantification.

Related Standards

• ISO 1833 Series
  A comprehensive series covering quantitative chemical analysis of textiles, including:
  • ISO 1833-1: General principles for quantitative chemical testing of textiles
  • ISO 1833-12: Method for mixtures of acrylic, modacrylic, chlorofibres, and elastane using dimethylformamide
  • ISO 1833-13: Method for certain chlorofibres blended with other fibres using carbon disulfide and acetone mixtures

These related standards provide complementary analytical methods suitable for different fibre types and mixtures. ISO 1833-17:2019 offers a vital alternative method particularly when chlorofibres resist dissolution in solvents used by ISO 1833-12 and ISO 1833-13.

By utilizing ISO 1833-17:2019, textile analysts and manufacturers gain an essential tool for accurate, repeatable fibre composition analysis of complex textile blends containing cellulose fibres and chlorofibres, supporting quality assurance and compliance within the global textile market.