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How can I shrink 100 percent polyester?

"The simplest way to shrink polyester fabrics would be to heat them to
about 80-90C."

Excerpt from a science article linked below. It gives you the how-to and how and why it shrinks.

Article from 1999 http://www.madsci.org/posts/archives/nov99/943908244.Eg.r.html
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