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CAT NO: DIDACTICNLE-Export-380014
Compression Set Apparatus Constant Stress For Testing Lab Workshop.
Compression Set Apparatus Constant Stress -
Compression Set Apparatus Constant Stress Quick Clamping Type
Compression
set of rubber components is defined as the difference between the
original thickness and that after compression and subsequent recovery,
expressed as percentage of the initially applied compression. The disc
shaped test specimens are either obtained from the component or moulded
from the compound from which the component is to be moulded It
determines the ability of the rubber compound or the component moulded
from it to retain its elastic property after prolonged compression.
Compression
set may be determined after subjecting the test specimen either to a
constant deflection, or after pressing it under a constant load.
Compression set under constant deflection is determined by subjecting
cylindrical disc shaped test specimens to a fixed strain for specified
time at either room temperature or any other specified temperature, and
then allowing it to recover for given time.
The Compression Set Apparatus for determination of compression set under constant strain (quick clamping type)
consists of four polished stainless steel plates having flat and
parallel ground faces. These plates are fitted on a rigid metallic
frame. A pair of rods is provided to locate the plates. The compressed
thickness is maintained with the help of three pairs of spacers of
thickness 9.50 mm. Compression springs are placed within these spacers
to automatically lift the plates on release of the compression load, and
serve to increase the gap between the plates for inserting or removing
the test specimens.
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