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Exposure Rack for Textiles:
All textile
materials experience change in colour when exposed to daylight for a
sufficiently long period of the action of daylight on pigments used
in them. The severity of exposure in both time and intensity of
daylight determines the extent of change in colour. The colour
fastness is denoted by the number of the light fastness standard
fabric that has changed colour to the same extent as the test
specimen. It is expressed as the numerical rating for light fastness.
The “ASIAN”
Exposure Rack is designed to test colour fastness of textiles
materials to daylight. The test is carried out by exposing a set of
light fastness standard fabrics 1 to 8 and a set of test specimens to
daylight till the desired fading of the colour is obtained. The
change in colour of exposed area of the test specimens and the light
fastness standard fabrics is then examined and the relative degree of
colour fastness of test specimens determined.
The equipment
consists of a frame made of wood with a glass framed wooden lid
hinged over its top. The frame is fitted on a steel stand so that it
can be kept in open with the frame located at a convenient working
height and tilted at 45º to the horizontal.
The test specimen
and light fastness standard fabrics are mounted on a specials
mounting card designed to give specified coverings to them. Ten such
mounting cards designed to conduct the test in accordance with method
1 of Indian Standard specification are provided with apparatus. Extra
cards are available as optional accessories.
Technical Specifications:
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Size of frame
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600 mm X 450 mm
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Distance of glass from the samples
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50 mm (minimum)
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Angle of inclination of frame from
horizontal
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45º
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