33 32 Grain comparison table/Roughness depth Note: the exact nish (Ra value) depends on factors like contact pressure, speed of work, carrier hardness and the material being processed, and can vary by +/- 20% depending on the working method. Grain comparison table Europa FEPA Structured abrasive Non-woven nylon USA ANSI/CAMI Roughness depth Ra (guideline figures) TZ FVV P 2500 A 6 1200 0.06 0.30 0.08 0.09 P 1800 1000 P 1500 800 P 1200 A 16 UF 600 0.15 0.40 0.16 0.18 P 1000 500 P 800 SF 400 P 600 A 30 360 0.29 0.65 0.35 0.25 P 500 P 400 A 45 320 0.45 0.90 0.48 0.30 P 360 VF 280 P 320 P 280 A 65 240 0.70 1.10 0.78 0.45 P 240 A 80 M 0.85 1.20 0.90 0.50 P 220 A100 220 P 200 P 180 180 P 150 150 P 120 A 160 C 120 P 100 100 P 80 A 300 80 P 60 VC P 50 EC 60 P 40 50 P 36 36 P 30 30 P 24 24 UF = ultra fine , SF = super fine, VF = very fine, M = medium, C = coarse, EC = extra coarse, VC = very coarse FEPA = Federation of European Producers of Abrasives Products, ANSI = American National Standards Institute Our grinding tools comply with the FEPA standard. A wide variety of tools for the most demanding requirements Suhner offers complete solutions consisting of a perfectly balanced range of machines and abrasives for the toughest demands. Our grinding tools are designed to improve any kind of abrasive surface processing. From roughening and grinding with enhanced material removal, to precise milling, brushing and polishing – Suhner grinding tools offer impressive quality and reliability. Abrasive grain Abrasive grains are applied to backings in bonded tools and abrasives. Grain sizes range from P24 (material removal) to P2500 (polishing), depending on tool type. We differentiate between 4 grain types, each of which has different properties. AO ZK SC CE Aluminium oxide Zirconia aluminia Silicon carbide Ceramic grain Moderately hard and resistant, but less sharp than other grains. Requires little contact pressure. Medium-hardness, very sharp, resilient and heat-resistant grains. Ideal for heavy machine processing involving high contact pressures. Hard and sharp abrasive grain, but very fragile. Low contact pressure required. Suitable for exotic metals as well as non-ferrous metals and plastic. Hard, resilient abrasive grain with micro- crystal structure. Guarantees a longer lifespan than other grains. For fast and aggressive abrasion. Requires low to medium contact pressure. Cutting performance In the overview of each section, cutting rates for each of the grinding tools are shown graphically, where represents high abrasion and represents polishing. This categorisation relates not only to the grain sizes available, but also to cutting performance, grain quality and the bonding of the abrasive. Example: Tool is suitable for maximum cutting rates. Notes on products Structured abrasives High-quality precision tools, developed for optimising processes and reducing processing times. Excellent cutting performance, long lifespan and better surface quality. Greatly reduce the amount of work and the number of tool-changes. CE II CG TZ High-performance grinding tools with precision- formed ceramic abrasive grains. For maximum, fast abrasion. Less heat production and inconsistencies, since the grains penetrate the surface evenly. Compact grain with very open spread. Efficient abrasion rate with uniform and constant surface roughness. Impressively long service life and minimal dust production. Precision tools for refining and finishing. They produce a high-quality, consistent and reproducible sanding pattern. The number of sanding stages can be significantly reduced, and with them the cost of equipping. Grinding agent Most of our abrasive belts and discs are given an active abrasive coating. This increases the abrasive grain’s lifespan and reduces heat production – and with it any damage done to the workpiece. It also promotes the removal of cuttings, which increases the cutting rate and reduces abrasive clogging.
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