ISO 105-N04-1993 PDF

Full title and description

ISO 105-N04:1993 — Textiles — Tests for colour fastness — Part N04: Colour fastness to bleaching: Sodium chlorite (severe). This part of ISO 105 specifies a laboratory method for determining the resistance of the colour of natural-cellulose textiles to severe bleaching with sodium chlorite as used in textile processing.

Abstract

Specifies a method in which a specimen (in contact with one or two specified adjacent fabrics) is treated in a sodium chlorite bleaching solution, rinsed and dried; the change in colour of the specimen and staining of the adjacent fabric(s) are assessed using the grey scale. The method is intended for natural cellulose textiles and reflects bleaching conditions commonly used in textile processing.

General information

• Status: Published; confirmed (international standard under ISO review cycle).
• Publication date: October 1993 (1993-10).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.080.01 (Textiles).
• Edition / version: Edition 2 (1993).
• Number of pages: 2 (as published by ISO).

Scope

This part of ISO 105 applies to the determination of the resistance of dyes on natural-cellulose textile materials to severe sodium-chlorite bleaching baths used in textile processing. The procedure defines specimen preparation, contact arrangement with adjacent fabrics, treatment conditions, rinsing and drying procedures, and the visual assessment of colour change and staining by means of the grey scale. The method is primarily intended for natural and regenerated cellulose materials in their normal finished states.

Key topics and requirements

• Test purpose: assess resistance of textile colour to severe sodium chlorite bleaching.
• Applicability: natural-cellulose textiles (and regenerated cellulose as appropriate).
• Specimen arrangement: specimen placed in contact with one or two specified adjacent fabrics to evaluate staining.
• Treatment steps: exposure to specified sodium chlorite bleaching solution, followed by rinsing and drying under defined conditions.
• Assessment: change in colour of the specimen and staining of adjacent fabrics assessed visually using the ISO grey scale for change in colour and staining.
• Intended outcome: reproducible, comparable results for process control, quality assurance and interlaboratory comparison.

Typical use and users

Test houses, textile manufacturers, dye producers, quality control laboratories, research laboratories and conformity assessment bodies use this method to evaluate how textile colours withstand severe sodium-chlorite bleaching normally encountered in processing or end-use environments. It is used for production quality checks, material specification and troubleshooting of dyeing/finishing processes.

Related standards

ISO 105 is a multipart series covering many colour‑fastness tests. Closely related parts include general principles and grey-scale guidance (e.g., ISO 105-A01), other bleaching tests such as ISO 105-N01 (hypochlorite) and many washing, rubbing and light exposure parts in the ISO 105 family (for example ISO 105-C06 for washing, ISO 105-B02 for rubbing, ISO 105-A02/A03 for grey scale / evaluation guidance). Users commonly apply the appropriate ISO 105 A-series procedural guidance together with the specific N04 method for complete assessment.

Keywords

colour fastness, bleaching, sodium chlorite, textiles, natural cellulose, test method, grey scale, ISO 105, colour change, staining

FAQ

Q: What is this standard?

A: ISO 105-N04:1993 is an ISO test method that specifies a procedure to assess the colour fastness of natural-cellulose textile materials to severe bleaching using sodium chlorite.

Q: What does it cover?

A: It covers specimen arrangement, treatment with a sodium chlorite bleaching bath, rinsing and drying, and the visual assessment of colour change and staining using the ISO grey scale. The method is intended to reflect bleaching practices used in textile processing.

Q: Who typically uses it?

A: Textile manufacturers, dye houses, independent test laboratories, research institutions and quality assurance/conformity assessment organizations use this standard for production control, material specification and comparative testing.

Q: Is it current or superseded?

A: According to the ISO bibliographic record this edition (Edition 2, 1993) was published in October 1993 and is recorded as published/confirmed in the ISO lifecycle records; users should check the ISO catalogue for the latest confirmation or revision status before relying on the standard for regulatory or contractual purposes.

Q: Is it part of a series?

A: Yes — ISO 105 is a multipart series of colour‑fastness test methods. N04 is the part that addresses sodium chlorite (severe) bleaching; other parts cover hypochlorite bleaching, washing, rubbing, light, perspiration, and additional specific treatments.

Q: What are the key keywords?

A: colour fastness; sodium chlorite; bleaching; grey scale; natural cellulose; textile testing; ISO 105; staining; colour change.