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Lightfastness standard and test method

Author:QINSUN Released in:2023-06 Click:124

Fadefastness refers to the ability of dyes and polymer systems to retain their color when exposed to sunlight. The main reason for the color change of colored products exposed to sunlight is the deterioration of colored products by ultraviolet rays and visible rays in sunlight.


1 The Standard for Lightfastness1.1 ISO 1051.2 AATCC 162 Test Method for Color Fastness to Light2. 1 Kinds of test method2.2 Influencing factors2.3 Function3 How to improve lightfastness

The standard of lightfastness

In general, the most common standards for lightfastness test are AATCC 16, ISO 105 B02 , ISO 105 B04, ISO 105 B06 . ISO 105 B02 has five test methods and AATCC 16 has six test options. Among these, option 6 in AATCC 16 corresponds to ISO 105 B01 and option 3 corresponds to ISO 105 B02.

ISO 105

condition/methodcharacteristicexposure timecolor fasTness evaluationMethod 1Check the test sample to control the exposure cycle. The color difference of the sample reaches grade 4 and grade 3 of the gray card. Compare it with the blue wool reference when the gray card reaches grade 3. Method 2Check the blue wool reference to control the exposure cycle The color difference of the blue wool references #2, #6 and #7 reaches gray card class 3, 4 and 4. First, do an assessment when the blue wool reference # 2 reaches gray card class 3, and finally make the assessment Final assessment Method 3: Exposure allowed with only two blue wool references The color difference of the blue wool with the lowest acceptable fastness reaches gray card class 4 and 3. Assessment when the Gray card achieves class 3. Method 4: exposure only permitted with reference sampledifference of the reference The sample achieves levels 4 and 3 of the gray card. Assess \"conformity\" or \"non-conformity\" in comparison to the reference sample. Method 5: Exposure alone or exposure with blue wool referenceUntil the required irradiance is reached. Contrasted with gray card or blue wool references.

Method 1: Exposure time is controlled by checking blue wool reference standards. Each sample should be provided with a set of blue wool references reference standards normally used in disputes.Method 2: Control the exposure time by checking the blue wool reference value. Only one set of blue wool reference values ​​is required for a batch of different samples. You can save the reference value for blue wool.Method 3: This method is used to verify that the sample meets known performance specifications. Depending on the requirement, the sample only has tobe equipped with two blue wool benchmarks and the exposure time can also be controlled by checking the blue wool benchmark markings. Method 4: This method is used to check whether one or more samples correspond to an agreed reference sample. The essential feature is to control the exposure time by checking an agreed reference sample. Allows samples to be exposed using only reference samples and no blue wool references are used. Method 5: This method is suitable for checking compliance with agreed radiation values. The sample can be exposed alone or with the blue wool reference. The samples must be exposed until the specified radiation energy is reached. AATCC 16

Lightfastness Test Method

The test for the light fastness refers to a Ttest method for testing the degree of staining of an object against exposure to light under certain conditions. It is an important piece of data for measuring the lightfastness of various substances under various exposure environments. In everyday technical applications, lightfastness is one of the main indicators for assessing materials. The most common use of lightfastness test is to measure the lightfastness of inks, dyes, plastics, coatings and other materials under exposure conditions.

Types of Test Method

In general, lightfastness test is divided into two types according to the mode: long exposure mode and uniform exposure mode .

Time exposure mode means that in a specific environment, the sample is exposed to light for a specific period of time before testing. At this time, the color difference caused by the light measurement is the most important parameter;

The sameModerate exposure mode means that the sample is placed on a device with stable spatial conditions that accepts a specific light intensity and exposure environment. After a period of time, the change in color difference reflects the lightfastness of the sample.

In the test, in addition to clearly describing the exposure environment of the sample, other technical requirements are important factors that affect the test accuracy. The exposure environment should choose a uniform pure white light source illuminating the CE range should be between 1000-5000 lux and the temperature should be kept at 20-25℃. In addition, to ensure test accuracy, samples must be adequately protected during testing. Make sure that this is not affected and damaged by external influences such as moisture, pollutants, etc.

Influencing factors

The test byFastness to light is a complex, precise and time-consuming test, the precision and accuracy of which are largely affected by the technical requirements in the testing process. In the process of lightfastness testing, controlling the testing environment and exposure conditions, ensuring the accuracy and precision of the testing instruments, and applying reasonable testing methods and correct testing techniques are the basic requirements for obtaining accurate data.


The lightfastness test is an important one Technology for measuring the lightfastness of materials, and its evaluation results can form a basis for the application of ensuring the color stability and durability of materials in complex environments. In the evaluation of materials in many industries, the color fastness test to light has become a consensus, which also leads to the color fastness test to LiThis is more common in practical applications.

In addition, lightfastness testing is also very important when evaluating the sun protection performance of nonwoven fabrics, especially for fabrics that, in addition to the requirement of adequate color depth and color, also meet the technical requirements of Satisfying sunscreen products To ensure color stability, good lightfastness is also required, with the lightfastness test playing a particularly important role.

In summary, the test is an important technology for measuring the lightfastness and colorfastness of materials. It not only plays an important role in the lightfastness evaluation of various materials, but also plays an important role in evaluating the performance of non-woven sunscreens. Given the importance of the lightfastness test, we should prepare for the actual operation test to ensure the quality of the testand get more accurate and reliable data.