Dynabrade - Abrasives Katalog Sida 141
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COATED ABRASIVE BASICS COATED ABRASIVE BASICS BACKING TYPES PAPER The smooth surface of paper results in products that can generate a consistent finish. Paper backings range in weights and corresponding thicknesses from A-weight to F-weight with A being the thinnest and most flexible to F as the thickest most durable. A, B, C and D weight - commonly used for hand sanding and light to moderate machine sanding in the form of sheets, PSA (pressure sensitive adhesive) and Hook and Loop discs and sheet rolls. E and F weight - for more aggressive mechanical operations and are used most commonly in the form of belts and discs. 138 CLOTH Common cloth types used in coated abrasives are cotton, polyester, polyester, nylon, polyester/cotton blends, and rayon. Before it is coated with adhesives and abrasive grain, cloth backings first need to be filled or finished. A variety of fill or finishing materials are used to fill the voids and gaps in a woven cloth backing and can include glues, resins, or combinations of both to create various characteristics like flexibility, and toughness. FIBER Vulcanized fiber (a process where cotton fibers are chemically treated and then pressed under temperature and pressure to form a very durable backing) is used as the backing for resin fiber discs. POLYESTER Cloth backings are also identified by weight with the three most common being: J-weight – most flexible X-weight – a common heavy cloth that varies the most in flexibility, strength, and durability Y-weight - heavyweight cloth expressly used for high stock removal operations. Polyester film backings come in several thicknesses with 3 mil. and 5 mil. being the most commonly used for coated abrasives. Polyester films have high strength and are the smoothest of surfaces ensuring even coating. Film backed coated abrasives are most commonly used in disc shapes and rolls for applications requiring precise and consistent surface finish. dynabrade.com
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