Bob Purcell (Chief Threadologist of Superior Threads) discusses Cotton and Polyester Threads. The class attendees take part in a fiber test which surprises them all. Polyester thread will not tear through your fabric. Tearing through fabric has nothing to do with the fiber type but has everything to do with fiber strength. The cotton thread in this fiber test is twice as strong as the polyester thread.
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Thread Therapy with Dr. Bob DVD
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