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Leather inlays, which are similar in form to inlays in woodworking, are shaped pieces of leather the same thickness as the covering leather on a book.A piece of leather the same shape, size, and thickness as the inlay is removed from the covering leather, and the inlay is placed into the resulting space.
Chiffon—6 to 8 mm (can be made in double thickness, i.e. 12 to 16 mm) Crepe de Chine—12 to 16 mm; Gauze—3 to 5 mm; Raw silk—35 to 40 mm (heavier silks appear more "wooly") Organza—4 to 6 mm; Charmeuse—12 to 30 mm; The higher the weight in mommes, the more durable the weave and the more suitable it is for heavy-duty use.
For example: 40 weight = 225 denier = tex 25 = [theoretical] commercial 27.8 . A common tex number for general sewing thread is tex 25 or tex 30. A slightly heavier silk buttonhole thread suitable for bartacking, small leather items, and decorative seams might be tex 40. A strong, durable upholstery thread, tex 75.
A gauge number denotes a thickness on a standardized scale which, for most purposes, starts at 20g (0.812 mm thick— often used for the posts for nose studs), and increases in thickness (as the gauge number decreases) to 0g, then 00g, and rarely goes any further as these thicknesses come closer and closer to 1 ⁄ 2 ″.
Bonded leather, also called reconstituted leather, is a material that uses leather scraps that are shredded and bonded together with polyurethane or latex onto a fiber mesh. The amount of leather fibers in the mix varies from 10% to 90%, affecting the properties of the product.
Skiving is the process used in leather crafting to reduce the thickness of leather, especially in areas that are to be bent or folded and which must be pliable without becoming weakened. It is usually performed on the "flesh" side of a piece of leather rather than the "finished" (hair) side. [1]
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The number of wraps will act as a gauge to assess the thickness of unmarked yarn; for example 12 wraps per inch is 12 WPI, and is used to calculate how much yarn is required for various articles, [3] so that 12 is equivalent to 8 ply (worsted weight, medium weight) yarn.