42 / Coated Abrasives www.youtube.com/NortonAbrasivesEMEA The Norton coated abrasive and BearTex product offering encompasses a complete range of belts, discs, rolls, sheets and flap wheels for all your polishing, welding, maintenance and repair operation needs. This extensive product range includes products designed for all types of application, including heavy stock removal, dimensioning, grinding, deburring, cleaning, blending, polishing and finishing operations. UNDERSTANDING THE PRODUCT INTRODUCTION BACKING TYPES Whether paper, cloth, vulcanised fibre or polyester film, the backing must be smooth enough for uniform adhesive coating, strong enough to withstand grinding pressures and flexible enough to conform to contours if necessary. ABRASIVE TYPES The ideal abrasive grain offers maximum resistance to point wear, yet fractures before serious dulling occurs, thereby satisfying both stock removal and finishing requirements. ABRASIVE BONDS There are two main types of adhesives in use, one based on animal glue, and the more common based on synthetic heat hardenable resins. The adhesive is applied with a minimum of two bonding applications. The first, or maker, coat adheres the abrasive grain to the backing ensuring proper anchoring and orientation. After drying, or curing, the second, or sizer, coat is applied. The sizer adhesive, united with the maker bond, provides final grain anchoring and the proper total adhesive level for the finished product. COATED ABRASIVES R 9 2 9 BACKING PRINCIPAL ABRASIVE COATED RANDOM BACKING ACTIVE GRINDING LAYER MAKER COAT SIZE COAT ABRASIVE GRIT BACKING A - Light Paper F - Fibre G - Heavy Paper H - Heavy Paper K - Cloth Q - Various (e.g. Screenback & Film) R - Cloth S - Combination T - Waterproof Paper U - Norax W - Special (Cork) PRINCIPAL ABRASIVE 1 - Aluminium Oxide 2 - Aluminium Oxide 3 - Aluminium Oxide 4 - Silicon Carbide 6 - Emery 7 - Flint 8 - Zirconia Alumina 9 - SG - Ceramic Aluminium Oxide COATED Odd Number - Open coat Even number - Closed coat RANDOM Differentiates different products within the same product group COATED ABRASIVES
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