ASTM D2244 Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

ASTM D2244 is a test method used to calculate color differences between two samples by measuring their color coordinates using a spectrophotometer. It is commonly used in the manufacturing of paints, plastics, and textiles.


Introduction to ASTM D2244

ASTM D2244 is a standard test method designed to determine the color differences between two samples by calculating the differences in their color coordinates. The method involves the use of a spectrophotometer, which measures the color coordinates of each sample, and then calculates the differences between them. The results of this test are often used to ensure consistency in the color of products such as paints, plastics, and textiles. The results obtained through this method are especially used for quality control, reliability check, performance evaluation, and specification purposes.

The ASTM D2244 test method measures color coordinates of the specimen at different angles and under different lighting conditions to determine the color difference.

ASTM D2244 Test Method

The test method ASTM D2244 consists of two main steps: measuring the color coordinates of the two samples using a spectrophotometer and then calculating the color differences between them.

Measuring Color CoordinatesIn this step, the color coordinates of the two samples are measured using a spectrophotometer. The instrument measures the reflectance or transmittance of the samples at different wavelengths of light and then calculates their color coordinates using the CIE (International Commission on Illumination) color space. The color coordinates typically measured are L*, a*, and b*, which represent the lightness, red-green, and blue-yellow color components, respectively.
Calculating Color DifferencesOnce the color coordinates of the two samples are measured, the color differences between them are calculated using the following formula:ΔEab = [(ΔL)² + (Δa*)² + (Δb*)²]½Where:ΔEab = the color difference between the two samplesΔL = the difference in lightness between the two samplesΔa* = the difference in red-green color between the two samplesΔb* = the difference in blue-yellow color between the two samples

ASTM D2244 Specimens

Specimen detailsASTM D2244 specimen is a flat surface of the material to be tested
Specimen dimensionsThe acceptable specimen size for ASTM D2244 is 25.4 mm × 25.4 mm. The thickness of the specimen is kept consistent throughout the entire surface.
Specimen preparationThe specimen is prepared according to the guidelines provided by the manufacturer or as specified in the test method. The specimen is cleaned and dried before the test. The specimen is placed on a flat surface, and the instrument is calibrated according to the manufacturer’s instructions. 

ASTM D2244 Results

The results of ASTM D2244 are typically reported as the color difference (ΔEab) between the two samples. The smaller the ΔEab value, the closer the color of the two samples. In general, a ΔE*ab value of less than 1 is considered to be imperceptible, while a value of 2 or greater is considered to be noticeable to the human eye.

Tests related to ASTM D2244
ASTM D2244 is often used in conjunction with other color tests, such as ASTM D1003 for haze and ASTM D2240 for hardness, to ensure that products meet specific color requirements. It is also used in various industries such as automotive, cosmetics, and food to ensure consistency in product color.


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How many samples are required for astm d2244?

The required number of samples or specimens should comply with the procedure given in the astm d2244 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

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The turnaround time for astm d2244 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

Where can I get the astm d2244 tested?

You can share your astm d2244 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d2244 test to various testing techniques.

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