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Foam quality is determined by
stretching a piece of foam to capacity and
measuring its length.
Foam quality is determined by stretching a piece
of foam to capacity and measuring its length.
Capacity refers to the percentage of stretching
that can be done before the foam tears. Tensile
strength is determined by measuring the force
needed to tear a length of foam, with a nick
made in the sample to start the tear.
Another test, hysteresis, measures how much
compression and stretching a foam sample can
take before it permanently loses its ability to
spring back. The higher the hysteresis number,
the higher the quality of the foam.
These tests apply to all types of foam
regardless of their uses. They provide good data
for determining the purposes suitable for
particular densities and types of foam.
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