is a material made up of
with a mix of polyesters. When heat
is applied to this material it decreases
in size so that it forms a seal over whatever
it was covering. Shrinkwrap
found on CDs, DVDs and software packages,
but can also be found as safety sealant
on jars and bottles as well as to seal off
exposed, soldered joints in electric wiring.
Commercial shrinkwrap usually takes the
form of a clear film applied to products
to protect them from dust, pests, surface
contamination and moisture. The shrinkwrap
provides a tamper-evident seal that helps
ensure freshness and discourage pilfering.