ISO 105-Z08-1995 PDF

Full title and description

ISO 105‑Z08:1995 — Textiles — Tests for colour fastness — Part Z08: Determination of solubility and solution stability of reactive dyes in the presence of electrolytes. Describes a laboratory method to determine how reactive dyes behave (solubility and stability) in aqueous dyeing media when common electrolytes are present, simulating conditions encountered in both batchwise and continuous dyeing processes.

Abstract

This part of ISO 105 specifies a test procedure for determining the solubility and solution stability limits of reactive dyes in the presence of electrolytes. The method covers preparation of dye solutions, controlled addition of electrolytes, storage/conditioning at specified temperatures, filtration and assessment (visual inspection, filter residue and flow‑through time). Results are reported as solubility/stability limits (g/L) together with test conditions and observations.

General information

• Status: Published — International Standard (confirmed during systematic review in 2023).
• Publication date: June 1995 (published 1 June 1995).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.080.01 (Textiles in general; colour fastness testing).
• Edition / version: Edition 1 (1995).
• Number of pages: 5 (ISO edition).

Scope

Applies to reactive dyes and specifies a laboratory procedure to determine the concentrations at which such dyes remain soluble and stable after the addition of electrolytes commonly used in dyeing (examples: sodium chloride, sodium sulfate, sodium carbonate, sodium hydroxide, urea, sodium silicate). The test simulates conditions in batch and continuous dyeing processes and is intended to provide reproducible solubility and stability limits for formulation, quality control and process troubleshooting.

Key topics and requirements

• Principle: prepare a series of dye solutions, add defined electrolyte solutions, condition at set temperatures/times, then assess by filtration and visual inspection.
• Apparatus & reagents: laboratory glassware (boiling/Erlenmeyer flasks), thermostatic baths/heating, filtration equipment, specified filter paper, and water conforming to laboratory‑grade standards.
• Test parameters: defined temperatures, electrolyte types and concentrations, storage times and handling to reflect batch or continuous processes.
• Evaluation criteria: presence/amount of filter residue, changes in filtrate flow‑through time, and visual evidence of precipitation or instability; results expressed as solubility/stability limits (g dye per litre) and descriptive observations.
• Reporting: test temperature, electrolyte identity and concentration, sample preparation details, filtration results, any deviations from the standard procedure.
• Normative references: laboratory glassware and water quality standards used to ensure reproducibility (normative references appear in the standard).

Typical use and users

Used by dye manufacturers, textile chemists, contract dye houses, quality control and R&D laboratories to assess reactive dye behaviour in formulated dye baths. Also used by standards bodies and testing laboratories for specification, acceptance testing and troubleshooting precipitation or leveling problems in dyeing operations.

Related standards

Other parts of the ISO 105 series (textiles — tests for colour fastness), for example related Z‑parts addressing solubility or dispersibility of other dye classes (ISO 105‑Z04, ISO 105‑Z09, etc.). Normative references within the document include laboratory glassware and water quality standards used to control test conditions. EN/ national identical adoptions (EN ISO 105‑Z08, BS/IS/UNE adoptions) also exist.

Keywords

reactive dyes, solubility, solution stability, electrolytes, dyeing, colour fastness series, filtration, solubility limit, batch dyeing, continuous dyeing, ISO 105‑Z08:1995

FAQ

Q: What is this standard?

A: ISO 105‑Z08:1995 is a part of the ISO 105 series (tests for colour fastness) that specifies a laboratory method to determine the solubility and solution stability limits of reactive dyes when electrolytes are present.

Q: What does it cover?

A: It covers preparation of dye solutions, controlled addition of electrolytes, conditioning, filtration and assessment (visual and filtration‑based criteria) to determine solubility/stability limits expressed in grams per litre, together with required test conditions and reporting elements.

Q: Who typically uses it?

A: Dye producers, textile mills, contract dyers, QC and R&D laboratories, and standards/testing organizations that need to characterise dye behaviour in practical dyeing conditions.

Q: Is it current or superseded?

A: The ISO edition is the 1995 (first) edition. The document was reviewed and confirmed in 2023 and therefore remains current as the active ISO text.

Q: Is it part of a series?

A: Yes — it is Part Z08 of the ISO 105 series (Textiles — Tests for colour fastness). Many parts in the ISO 105 family address different dye classes, fastness properties and test methods.

Q: What are the key keywords?

A: Reactive dyes, solubility, solution stability, electrolytes, filtration, dyeing processes, colour fastness, ISO 105.