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Perspirometer:
Colour fastness of dyed
or printed fabrics against perspiration is determined by exposing the
fabric sample to the action of both alkaline and acidic reagents
while in contact with undyed adjacent fabrics is placed between
plastic plate under a fixed load inside an oven maintained at 37 C.
The apparatus used for this test is called the perspirometer.
The “ASIAN”
Perspirometer consists of a number of acrylic plates which can be
kept in a suitable loading frame. The loading frame consists of two
steel plates between which the acrylic plates are placed. The test
specimen are stitched between suitable white cloth pieces and dipped
in either alkaline or acidic test solutions. The composite sample in
placed in between any two acrylic plates. A number of test specimens
can be loaded simultaneously between different sets of acrylic plates
by stacking them one above the other. Loading is done by keeping a
standard dead weight on top of the upper plate’s assembly, which
consists of two parallel plates separated by suitable compensating
spring. The guide rod attached to top plate of this assembly is
locked while under load and the load removed. The spring compensates
for subsequent variation in load due to variation in thickness of the
test specimens on drying.
The test is continued for
the required time under the specified condition of temperature. After
this the samples are removed from the frame and dried. The degree of
staining of the white pieces of cloth and change in colour of the
test specimens are evaluated using Grey scale and compared against
standard rating card. The entire components are made of mild steel
and are bright chrome plated to give them a corrosion resistant
finish. Perspirometer made from stainless steel can also be supplied
against special order.
Technical Specifications:
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IS: 971- 1983
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Method of determination of colour fastness of textile material to perspiration
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AATCC
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Method of test for colour
fastness to perspirometer.
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