Silicone and Non-Silicone Finishes The purpose of finishing is to adapt sewing thread to specific end use. The type of sewing machine and the materials to be stitched require finishes that will give the thread maximum efficiency. A seam should be stronger than the material itself. Each sewing operation must be individually considered... the number of stitches per inch, the proper selection of needle, the size of thread and the finish on the thread (a finish to permit it to enter the seam with the least abrasion possible). It is not enough to know the tensile strength of a thread; the vital factor is how much of the original strength remains in the thread when in the seam. Inasmuch as the thread is drawn back and forth many times through the needle and the material, abrasion can break filaments in the thread and thereby substantially weaken it. When harsh materials are sewn, bonded thread is recommended -- also, a further guard against fraying, due to the heat involved in high speed sewing. A bonded thread with a synthetic resin or alloy coating that serves as a protection or guard against broken filaments. Both as to polyester or nylon. Science has discovered that synthetic resins are similar in many respects to metals... they can be melted, reshaped, softened or hardened and made pliable or brittle. They can be blended or mixed into alloys with the best characteristics of each retained. Some of these resins can be molecularly aligned to produce tremendous strength. We found that certain alloys of synthetic resins had an excellent resistance to heat. An application of this substance to both bonded and soft synthetic fibers resulted in a thread with exceptional qualities. UVR (Ultra-Violet Rays) Finishes UVR finishes provide protection against the harmful damage caused by prolonged exposure to the sun. Translucent Colors Translucent colored thread allows a manufacturer to utilize fewer colors of thread in production. Because of its translucent quality, it "takes on" or blends with the surrounding fabric.