ISO 105-X11 is used to evaluate the resistance of the textile colors to dry heat under controlled temperature and pressure conditions and this method simulates the ironing and heat pressing processes to assess the change of shade and staining, which helps to ensure that the dyed or printed fabrics maintain the overall appearance and performance during both high-temperature industrial and consumer applications.
Definition of Scorch Fastness Test
This test measures the resistance of dyed textile materials to color change and staining when exposed to dry heat, typically during ironing or heat pressing. At elevated temperatures, the dye molecules may degrade or partially volatilize, leading to changes in shade or transfer to adjacent materials. ISO 105-X11 standardizes this evaluation, enabling textile labs to assess the thermal stability of dyes and finishes under controlled pressure, temperature, and contact conditions representative of a real processing environment.
Scorch Fastness Tester
The test is conducted using the Darong scorch and sublimation tester, which is equipped with precision-controlled heated plates, uniform pressure application, and an accurate timing system. This instrument fully ensures compliance with ISO 105-X11 by simulating industrial pressing conditions, enabling reliable assessment of color stability and staining behavior under dry heat exposure.
Darong Advanced Scorch and Sublimation TesterScience Behind Scorching Test
This test is based on the thermal sensitivity of dyes and the interaction between dye and fiber. When exposed to elevated temperatures (110–200°C), the applied dyeing molecules may undergo chemical degradation, oxidation, or limited sublimation, depending on their structure and affinity for the fibers. Reactive dyes on the cellulosic fibers may show a change of shade due to bond instability, while disperse dyes on synthetic fibers such as polyester may exhibit slight vapor-phase migration. Heat can also alter the morphology of the fibers, which affects light reflection and perceived color. Pressure enhances contact between fabrics, which can promote dye transfer. This test evaluates the combined thermal and mechanical effects, providing insight into the dye’s stability during ironing and finishing processes.
ISO 105-X11- Color Fastness to Hot Pressing
Preparation of ISO 105-X11 Testing Specimen
Ready Testing Specimen ( Dyed Fabric Attached to Multifiber)The testing specimen is prepared by cutting the dyed fabrics into standard dimensions, usually 40 × 100 mm. The testing specimen is placed in contact with the undyed adjacent fabric, usually cotton or multifiber. The attached specimen must be aligned uniformly to ensure consistent surface contact during heat application.
Conditioning of ISO 105-X11 Testing Specimen
Both multifiber and testing specimens are conditioned under standard atmospheric conditions of 20 ± 2°C temperature and 65 ± 4% relative humidity. Proper conditioning ensures moisture equilibrium within the textile structure, minimizing environmental variation and improving the repeatability and accuracy of test results.
Testing Procedure
The conditioned specimen is placed between the heated plates of the Darong Scorch and Sublimation Tester, and the test is conducted under three conditions: dry, damp, and wet. The temperature is set according to the testing requirement, usually 110°C, 150°C, or 200°C. A specified pressure is applied, and the specimen is subjected to heat for a fixed duration, usually 15 seconds. After exposure, the specimen is carefully removed and allowed to cool under standard conditions without disturbance.
Controlled Temperature and Timing SettingEvaluation of ISO 105-X11 Testing Results
After cooling, evaluation is performed based on changes in shade and staining of the adjacent fabric, using a gray scale for shade changes and a spectrophotometer for staining.
Gray Scale for color Staining
Gray Scale for color ChangeReport Preparation
The test report must include all the important parameters to ensure traceability, repeatability, and compliance. The details that must be included in the test report are the reference standard, sample description, actual conditions, type of adjacent fabric, conditioning conditions, evaluation of test results, and equipment used.
Types of Industries That Require ISO 105-X11
- Garment industries
- Home textile
- Synthetic fabric manufacturers
- Blended fabric manufacturers
- Printing industry
- Technical textiles
Conclusion
ISO 105-X11 is an important test for evaluating the thermal stability of dyed textiles under real-life heat exposure conditions, and it helps identify potential shade changes and staining issues. The use of advanced testers such as Darong Scorch and Sublimation tester ensures the accuracy and reproducibility of results. Implementing this test enables manufacturers to meet international standards, reduce customer complaints, and ensure the long-term performance of textile products that are subjected to heat during use and processing.
FAQs
What is ISO 105-X11 colorfastness to hot pressing test?
This is a standardized test method used to evaluate color fastness to ironing and heat pressing. It helps measure changes in shade and staining when the fabric is exposed to controlled temperature, pressure, and time, replicating real garment-finishing conditions.
What is the purpose of the scorch fastness test in textiles?
The scorch fastness test determines how well a dyed fabric resists thermal degradation and discoloration during ironing or pressing. It helps prevent shade variation, yellowing, and dye transfer from the surface of the dyed fabric, ensuring consistent product quality.
What temperature is used in ISO 105-X11 testing?
Usually 110°C, 150°C, and 200°C, but its depending on the type of fiber and end-use. These levels simulate low, medium, and high ironing conditions, which are typically used in industrial and domestic settings.
What are dry, damp, and wet conditions in scorch testing?
Scorch testing includes three conditions: dry (no moisture), damp (slightly moistened), and wet (fully wetted). These conditions replicate the various ironing scenarios, affecting dye stability and migration behavior.
Which dyes are the most sensitive to scorch fastness?
Reactive dyes on natural fibers, such as cotton, may change shade due to bond instability, while disperse dyes on synthetic fibers, such as polyester, can exhibit slight sublimation. The chemistry of dyes significantly influences the heat resistance performance.
What equipment is used for ISO 105-X11 testing?
The scorch and sublimation tester, such as the Darong models, is used. It provides accurate temperature control, uniform pressure, and precise timing, ensuring reproducible, standard-compliant results.
How are results evaluated in scorch fastness testing?
The results of the scorch fastness test are assessed using gray scales for color change and staining, with ratings from Grade 1 to Grade 5. Grade 1 results indicate poor performance, while Grade 5 results show excellent performance. You can also use a spectrophotometer to quantitatively measure color differences and evaluate both the shade of change and staining.
Why is color fastness to ironing important for garments?
Poor fastness will lead to visible shade changes and staining during ironing, which affects the overall performance of the garments and customer satisfaction. This test completely ensures the durability under real-life heat exposure.
What factors affect the results of scorch fastness?
Various factors can affect scorch fastness results, including temperature, pressure, time, dye type, and fiber composition; even a small deviation can significantly affect the reproducibility and reliability of the test.
Which industries require ISO 105-X11 testing?
Different industries, such as apparel manufacturing, home textiles, sportswear, and heat transfer printing, rely entirely on this test to ensure color stability during finishing and use under high-temperature conditions.
Related Resources
AATCC 117/AATCC 133 Color Fastness to Scorch and Sublimation