KIPP Catalog Operating Elements & Standard Elements Page 1297
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Technical information for rubber buffers Note: Our rubber buffers are simple and cost-efficient standard units for elastic mounting. They are ideally suited for compressive and axial loads of a diverse range of applications. With shear stress however, they are substantially less resilient than with compressive stress. The adjacent tables provide a guide to the static load values. By high dynamic alternating loads or high frequencies the loading should be reduced proportionately. c2 Guide values for static load Type D H Compressive loads Shear stresses Permissible load F in N Spring rate c2 in N/mm Spring rate cx, y in N/mm Permissible load F in N hard medium soft hard medium soft hard medium soft hard medium A 20 15 300 190 120 500 320 200 60 40 30 190 120 70 A 30 15 670 410 250 1100 700 400 90 60 40 350 210 130 A 30 30 240 150 100 900 570 340 50 30 20 430 280 170 A 40 30 480 300 170 1800 1110 670 90 60 30 770 500 250 A 50 20 240 1500 90 5000 3190 1870 240 160 100 1200 770 460 soft A 50 40 600 280 220 2800 1750 1050 120 80 50 1280 800 460 A 75 25 5000 2900 1700 8000 5000 3300 410 260 160 2800 1750 1030 800 A 75 55 650 400 240 4700 3000 1750 130 80 50 2100 1300 B 25 20 320 160 120 490 320 190 70 45 25 230 160 90 B 30 20 660 430 260 830 520 310 100 75 50 330 210 130 B 40 30 550 350 210 1250 750 450 110 70 40 520 330 200 B 40 30 550 350 210 1250 750 450 110 70 40 520 330 200 B 50 40 560 370 220 2100 1270 760 120 80 45 930 580 350 B 50 50 350 220 130 1750 1100 650 80 50 30 800 510 310 B 75 50 950 630 330 4700 2910 1720 180 120 80 1900 1200 710 C 20 25 200 130 80 300 190 120 50 30 20 150 90 60 C 30 30 590 380 220 720 450 270 90 60 50 260 170 110 C 40 30 900 570 340 1080 680 410 150 90 60 380 240 140 C 50 30 1700 1090 650 2500 1750 950 210 150 70 470 290 170 C 50 50 360 220 140 1390 870 520 80 40 30 610 390 230 C 75 50 1010 630 370 3650 2050 1200 200 130 80 1560 980 580 H cx, y D Type D H Compressive loads Spring rate c2 in N/mm Permissible load F in N medium medium D 25 20 150 260 D 30 20 330 730 D 40 30 250 950 D 50 20 660 1750 D 75 25 1430 4650 Rubber hardness: hard = Shore 70 medium = Shore 55 soft = Shore 45 For general guidance natural rubber is ca. Shore 55. static compression load: F (max.) = ca. 6.5 kg/cm² (63.77 N/cm²) static axial load: F (max.) = ca. 1.5 kg/cm² (14.72 N/cm²) by 10 % spring displacement, or transverse travel during axial load. Naturally, much higher loads are possible without damage, but these considerably effect the rubber buffer in its primary purpose. Tensile loads are possible but should be avoided on account of the peak stress at the contact edges and the notch sensitivity of rubber. Tolerances for rubber buffers: Permissible dimensional deviations per DIN 7751 Part 2. Permissible hardness deviation ±5 Shore A. Synoptical Table - Properties of the Individual Material Rubber material Abb. NR (NK) SBR CR NBR EPDM SI 1 = excellent 1296 Main Characteristics - Resistance to Polymer Temperature Natural rubber Styrene-butadiene rubber Chloroprene rubber Acrylonitrile-butadiene rubber Ethylene propylene terpolymer Silicone rubber 2 = very good 3 = good Tensile strength Fracture elongation Aging Ozone Petrol Oil Acid Alkalis Tensile strain -30 °C – +80 °C 1 1 3 4 6 6 3 3 600% -30 °C – +80 °C 5 2 3 4 4 5 3 3 450% -20 °C – +110 °C 3 2 2 2 2 2 2 2 450% -30 °C – +120 °C 5 2 3 3 1 1 4 3 450% -30 °C – +130 °C 5 3 1 1 5 4 1 2 450% -60 °C – +200 °C 6 4 1 1 5 4 5 5 500% 4 = moderate 5 = low 6 = insufficient
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