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Physical Properties

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
rough=No,
smooth=Yes

Yes 3/16" only 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 -10 to 130 -10 to 130
Continuous Ambient Operating Temperature Limits** See note below °C -2 to 54 -2 to 54 -2 to 54 -2 to 54 -23 to 54 -23 to 54
"Short time" Ambient Operating Temperature Limits** See note below °F 10 to 155 10 to 155 10 to 155 10 to 155 -15 to 155 -15 to 155
"Short time" Ambient Operating Temperature Limits** See note below °C -12 to 85 -12 to 85 -12 to 85 -12 to 85 -26 to 85 -26 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 (Note: When colored black, all are UV resistant)     no no no no yes yes
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 -10°F, we recommend Hytrel. It has only fair abrasive resistance at room temperature, but at very low temperatures, e.g. -30°F, 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.

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