| Dura-Belt | 800-770-2358 | WHERE TO BUY | ||
| Cyclothane-A | Cyclothane-B | Cyclothane-E, -SD | ||||||
|---|---|---|---|---|---|---|---|---|
| Property and (description) | Test | Unit | 83A | 88A | 92A | 85A | 85A | 90A |
| Best application | Low cost | Rough surface is abuse resistant | Long-Life, Hi-Tension | Low-temp, Hi-humidity | ||||
| Food grade, FDA approved (* also NSF approved for contact with drinking water) | Yes | Surface | Yes | Yes | E=Yes* SD=No | E=Yes* SD=No | ||
| Shore Hardness (durometer) | ASTM D 2240 | "A" Scale | 83 ±3 | 88 ±3 | 92 ±3 | 85 ±3 | 85 ±3 | 90 ±3 |
| Ultimate Tensile Strength (force needed to break) | ASTM D 412 | PSI | 7,000 | 7,000 | 7,000 | 6,900 | 6,000 | 6,500 |
| Ultimate Elongation (% stretched at break) | ASTM D 412 | % | 500 | 450 | 400 | 540 | 450 | 400 |
| Tensile Fatigue Endurance (flex life for sharp 180° bends) | Zwick Flexometer | cycles to failure | >1,000,000 | >800,000 | >600,000 | >1,000,000 | >1,000,000 | >800,000 |
| Modulus of elasticity at 10% elongation (force to stretch 1% at 10% stretch) | ASTM D638 | PSI/% | 30 | 45 | 60 | 32 | 35 | 50 |
| Tensile Modulus - 100% Elongation (force to stretch 100%) | ASTM D 412 | PSI | 800 | 1,100 | 1,400 | 750 | 1,000 | 1,500 |
| Tensile Modulus - 300% Elongation (force to stretch 300%) | ASTM D 412 | PSI | 1,800 | 2,700 | 3,500 | 1,500 | 2,000 | 3,000 |
| Tensile set at failure (% stretched after break and rebound) | ASTM D 412 | % | 25 | 45 | 65 | 25 | 35 | 25 |
| Tear Strength (lateral force to tear) | ASTM D 624 | PLI | 425 | 500 | 550 | 420 | 400 | 500 |
| Compression set at 25% deformation (% squashed) | ASTM D 359-B | % | 18 | 22 | 25 | n/a | 23 | 30 |
| Abrasion Resistance (weight lost when ground) | ASTM C 501 Taber H18 | MG/M. | 40 | 55 | 70 | 42 | 46 | 68 |
| Coefficient of Friction on Steel | ASTM D 1894 | 0.53 | 0.46 | 0.38 | 0.52 | 0.50 | 0.35 | |
| Coefficient of Friction on Aluminum | ASTM D 1894 | 0.61 | 0.54 | 0.46 | 0.60 | 0.56 | 0.50 | |
| Coefficient of Friction on Brass | ASTM D 1894 | 0.70 | 0.62 | 0.52 | 0.69 | n/a | n/a | |
| Melting Point | °F | 390 - 410 | 400 - 420 | 400 - 420 | 390 - 415 | 340 - 380 | 380 - 420 | |
| Vicat Softening Point | ASTM D 1525 | °F | 196 | 325 | 331 | 190 | 186 | 314 |
| Continuous Ambient Operating Temperature Limits** | See note below | °F | 28 to 130 | 28 to 130 | 28 to 130 | 28 to 130 | 15 to 130 | 15 to 130 |
| Continuous Ambient Operating Temperature Limits** | See note below | °C | -2 to 54 | -2 to 54 | -2 to 54 | -2 to 54 | -9 to 54 | -9 to 54 |
| "Short time" Ambient Operating Temperature Limits** | See note below | °F | 10 to 155 | 10 to 155 | 10 to 155 | 10 to 155 | 0 to 155 | 0 to 155 |
| "Short time" Ambient Operating Temperature Limits** | See note below | °C | -12 to 85 | -12 to 85 | -12 to 85 | -12 to 85 | -18 to 85 | -18 to 85 |
| Solenoid Brittle Point (freezing temperature) | ASTM D 746 | °F | -95 | -95 | -95 | n/a | -95 | -95 |
| Dielectric Strength (electricity insulating strength) | ASTM D 149 (short time) | Volts/mil | 330 | 430 | 440 | n/a | n/a | n/a |
| Coefficient of Thermal Expansion (range -40°C to 140°C) | per °F | .0000670 | n/a | n/a | n/a | n/a | n/a | |
| Specific gravity | 1.20 | 1.21 | 1.22 | 1.20 | 1.12 | 1.14 | ||
| Density (weight per unit volume) | ASTM D 792 | Lbs/Cu. Ft. | 75.0 | 75.5 | 75.9 | 74.90 | 69.71 | 70.96 |
| UV resistant | no | no | no | no | no | yes, -E only | yes, -E only | |
| UL Flame Rating Certification | Ignition test | UL94HB > .058" thick | not tested | not tested | UL94HB | not tested | not tested | |
*NSF (National Sanitation Foundation) approved for contact with drinking water.
**The published temperature range is much wider. However, we have narrowed the range to reflect experience or to be more conservative. Even so, the physical properties of urethane decrease as temperature rises. Urethane belts that operate for years at 70°F may only operate for weeks at 150°F. We recommend ultra high temperature urethane belts for temperatures above 130°F (55°C). They can work as high as 230°F (110°C). At low temperatures urethane belts become brittle and take a set that is hard to overcome on start up. At temperatures below 15°F (-9°C), we recommend Hytrel. It has only fair abrasive resistance at room temperature, but at very low temperatures, e.g. -30°F (-34°C), as found in ice cream plants, its abrasive resistance increases.
These exhibits are guidelines only. Data was taken under laboratory conditions which may differ considerably from particular work environments. Before making a substantial purchase, users should test a number of prototype belts under the same conditions in which the belts will be expected to operate. Because we cannot control the many different conditions under which belts may be used, DuraBelt cannot assume responsibility for any application.