EN ISO 105-Z01:1995

Overview

EN ISO 105-Z01:1995 specifies a standardized test method for evaluating the colour fastness of wool textiles to metals present during the dyeing process, specifically focusing on the impact of hexavalent chromium salts. This test method is crucial for determining how these chromium salts influence the durability and appearance of dyed wool, ensuring high-quality textile production and consistent colour performance. An alternative, milder test method is also defined to assess effects of lower chromium salt concentrations typically found during shading.

Key Topics

• Scope and Applicability:
  • Designed specifically for wool fabrics subjected to dyeing processes involving chromium salts.
  • Evaluates the colour change due to the presence of hexavalent chromium (potassium dichromate) in the dye bath.
• Test Principle:
  • Two dyeings are performed simultaneously: one with chromium salts and one without, using the standard dyeing procedure for wool.
  • Colour difference is assessed using a grey scale designed for evaluating changes in textile colour fastness.
• Test Methods:
  • Method 1 (Standard Test): Addition of potassium dichromate at 1% concentration relative to wool mass; dye baths maintained at boiling for 60 minutes.
  • Method 2 (Milder Test): Addition of potassium dichromate at 0.2% concentration for less intensive exposure, suitable for shading assessment.
• Assessment and Reporting:
  • The colour difference is measured using the ISO grey scale for colour change, providing a numerical rating reflecting the level of colour fastness.
  • Test reports must detail the dye used, dyeing strength, test method, and obtained colour fastness rating.

Applications

• Quality Control in Textile Industry:
  Assists manufacturers in identifying the impact of metal contaminants on wool dyeing quality, ensuring consistency in the final product’s appearance.
• Product Development:
  Enables textile developers to select suitable dyes and dyeing conditions that minimize colour degradation in the presence of chromium salts.
• Regulatory Compliance:
  Provides compliance verification for textiles subjected to metal exposure in dyeing baths, helping meet industry and environmental standards.
• Consumer Assurance:
  Guarantees improved colour durability of wool products, increasing consumer confidence in textile longevity and appearance.

Related Standards

• ISO 105-A01: General principles of colour fastness testing in textiles.
• ISO 105-A02: Grey scale for assessing change in colour – used as the reference in EN ISO 105-Z01 for colour comparison.
• Other Parts of ISO 105: Address various tests for colour fastness to light, washing, rubbing, and other environmental factors affecting textile appearance and durability.

By following the procedures established in EN ISO 105-Z01:1995, textile professionals can confidently evaluate and control the effects of chromium salts on wool dyeing, optimizing textile performance and ensuring global standards compliance. This leads to enhanced product quality, better resource management, and reduced environmental impact in wool textile manufacturing.