Overview
EN ISO 105-X09:1995 is a European adoption of the international standard ISO 105-X09:1993, titled Textiles - Tests for colour fastness - Part X09: Colour fastness to formaldehyde. Published by CEN, this standard specifies a test method to determine the resistance of textile colors to gaseous formaldehyde exposure. The test is applicable to textiles of all kinds and forms, providing vital information on the durability of textile coloration when exposed to formaldehyde vapors.
The method involves exposing textile specimens to a controlled formaldehyde atmosphere and assessing any resultant color change using the ISO grey scale. It is important to note that this test is not suitable for detecting color changes caused by crease-resist finishing with urea-formaldehyde products or any subsequent dye treatments with formaldehyde-based solutions.
Key Topics
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Scope & Purpose
This standard applies to revealing the color fastness of textiles when exposed to formaldehyde vapors, simulating storage or treatment conditions where formaldehyde is present. It addresses the textile industry's need to ensure color stability in environments susceptible to chemical exposure.
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Test Principle
A textile specimen is suspended inside a sealed container above a dish containing a formaldehyde solution. Formaldehyde vapor saturates the atmosphere, reacting with the textile over 24 hours. After exposure, the specimen's color change is visually evaluated using a standard grey scale.
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Equipment & Materials
- Glass hell-jar (approx. 6 liters capacity)
- Glass frame for specimen suspension
- China dish (50 ml capacity) for formaldehyde solution
- Formaldehyde solution standardized to 350 g/kg concentration
- ISO grey scale for color change assessment (ISO 105-A02)
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Specimen Preparation
- Fabric specimens: 40 mm x 100 mm
- Yarn specimens: knitted into fabric or formed into a wick of parallel lengths
- Loose fibers: combed into a sheet supported on cotton fabric
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Testing Procedure
- Attach specimen to the frame hanging above the solution without contact
- Introduce 15 ml of formaldehyde solution into the dish
- Seal the jar and incubate at 20 ± 2°C (up to 27 ± 2°C for tropical climates) for 24 hours
- Air the specimen in indirect light for 24 hours post-exposure
- Assess and record color change per ISO grey scale criteria
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Test Reporting
Essential test report elements include:
- Reference to this part of ISO 105 with edition date
- Detailed sample information
- Numerical rating of color change observed
Applications
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Textile Quality Control
Ensures that textile products maintain color integrity when exposed to formaldehyde vapors common in manufacturing, finishing, or storage environments.
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Chemical Treatment Assessment
Although not suitable for crease-resistant finishing involving urea-formaldehyde, this test aids in evaluating textiles exposed to gaseous formaldehyde during handling.
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Textile Research and Development
Helps textile developers enhance dye formulations and treatments for improved formaldehyde resistance, supporting product innovation.
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Regulatory Compliance and Safety
Contributes to meeting industry standards related to chemical exposures and color fastness, important for consumer safety and satisfaction.
Related Standards
- ISO 105-A01:1989 – General principles of testing for colour fastness in textiles
- ISO 105-A02:1993 – Grey scale for assessing change in color, used for evaluation in this test
- Other parts of ISO 105 series address various colour fastness tests such as to washing, light, rubbing, and perspiration
Keywords
Colour fastness to formaldehyde, textile colour fastness tests, ISO 105-X09, textile testing standard, formaldehyde resistance textiles, textile colour durability, colour change assessment, grey scale evaluation, crease-resistant textile limitations, ISO 105 series