ISO 105-Z09-1995 PDF

Full title and description

ISO 105‑Z09:1995 — Textiles — Tests for colour fastness — Part Z09: Determination of cold water solubility of water‑soluble dyes. This part of ISO 105 specifies a laboratory method to determine the solubility behaviour of water‑soluble dyes in cold (25 °C) aqueous solution without prior heating; it is intended for comparative and quality‑control testing rather than measurement of absolute solubility.

Abstract

The standard describes a practical test procedure for determining whether and to what extent a water‑soluble dye dissolves in cold water (25 °C) under defined conditions. It sets out required apparatus, reagents, test specimen preparation, test conditions, observations and reporting format. The method is not intended to establish absolute solubility limits but to provide reproducible comparative data useful for dye formulation and textile quality control. Annexes list factors that may influence results.

General information

• Status: Published — international standard (confirmed following periodic review).
• Publication date: 1 June 1995 (Edition 1, published June 1995; last periodic confirmation: 6 February 2023).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.080.01 (Textiles — testing).
• Edition / version: Edition 1 (1995).
• Number of pages: 4 (concise test method; some language editions or adoptions may show small variation in pagination).

Scope

Specifies a laboratory procedure to determine the cold‑water (25 °C) solubility behaviour of dyes that are classified as water‑soluble. The procedure covers sample preparation, test liquids, test apparatus, conditions for dissolution, observation/measurement of solution clarity or residue and reporting. It applies to dyes and dye formulations used in textile processing where cold‑water behavior is relevant for handling, product performance or environmental/discharge considerations.

Key topics and requirements

• Definition of test temperature and conditions (25 °C; no prior heating) and rationale that method is comparative, not for absolute solubility values.
• Required apparatus and glassware, including specified agitation and filtration/observation steps to detect undissolved material.
• Sample preparation and specified quantities/concentrations to ensure reproducible comparisons between dyes or batches.
• Instructions for observation, criteria for judging solubility (clarity, presence of residue) and optional quantitative checks where applicable.
• Reporting requirements: identification of sample, test conditions, observations, any deviations and interpretation guidance.
• Annex describing factors that can influence results (purity, particle size, salts/electrolytes, pH, water quality) and recommended notes for comparability.

Typical use and users

Used by textile test laboratories, dye manufacturers, chemical formulators, quality assurance teams in textile mills, research organizations and regulatory or environmental testing bodies. Typical applications include incoming‑material checks, batch quality control, formulation development, and assessments related to handling/processing or wastewater management where cold‑water solubility affects performance or environmental fate.

Related standards

Part of the ISO 105 series (Tests for colour fastness) and closely associated with other Z‑parts that address solubility/dispersibility and stability of dyes (for example ISO 105‑Z04 and ISO 105‑Z08). Regional/adopted versions exist (for example UNE‑EN ISO adoptions). Consult the full ISO 105 collection for complementary test methods covering wash, light, rubbing and other colour‑fastness characteristics.

Keywords

ISO 105, colour fastness, dye solubility, cold water solubility, water‑soluble dyes, textile testing, dye quality control, solubility test, 25 °C.

FAQ

Q: What is this standard?

A: ISO 105‑Z09:1995 is an ISO test method that specifies how to determine the cold‑water (25 °C) solubility behaviour of water‑soluble dyes for textile applications. It is a concise, comparative laboratory procedure rather than a method for measuring absolute solubility.

Q: What does it cover?

A: It covers apparatus, test conditions, sample preparation, observation/interpretation criteria and reporting for cold‑water solubility tests of water‑soluble dyes. It includes guidance on factors that can affect results and how to document them to maintain comparability.

Q: Who typically uses it?

A: Textile test laboratories, dye and chemical manufacturers, QA/QC teams in textile production, R&D groups and environmental testing labs use this standard for product checks, formulation work and quality control related to handling and discharge behavior of dyes.

Q: Is it current or superseded?

A: The 1995 edition (Edition 1) remains the published edition. The standard was subject to ISO's periodic review process and was last confirmed in 2023, so this edition is considered current unless a newer revision is published after that confirmation.

Q: Is it part of a series?

A: Yes — it is one part of the ISO 105 series (Tests for colour fastness), which comprises many parts covering different test methods for colour fastness and related dye behaviour characteristics.

Q: What are the key keywords?

A: Colour fastness, cold water solubility, water‑soluble dyes, textile testing, ISO 105, solubility test, 25 °C, dye quality control.