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Digital Light Fastness Tester
Digital Light Fastness Tester
The UNILAB Digital Light Fastness Tester is used for determining the colour Fastness of textiles to Light using an artificial Light Source. (MBTL).Principle: A test specimen of the textile together with blue wool standards is exposed under prescribed conditions to the light from a MBTL 500 W Lamp. The Colour fastness of the specimen is assessed by comparing its performance with that of blue light fastness standards. Operation: Firstly the sample (60 x 15 mm) & Blue Wool standards are installed in the sample holders. In test tubes a small quality of saturated solution of Potassium Carbonate is added control the humidity. The sample is then hung from a wire hook in the test tube which is sealed by cork. The sample holders are water cooled & linked in series by plastic tubing. Water cooling is necessary as the temperature inside the drum can go up to 400 C above ambient temperature & at such levels dye migration may start & affect the light Fastness readings.