ASTM D1052 describes the Ross Type Rubber Flexing Apparatus which is designed for measuring the cut growth in rubber vulcanizates or synthetic elastomers by subjecting specifically prepared test specimens to repeated bend flexing.
The Ross Flexing Apparatus operates by clamping one end of the test specimen to an arm while the pierced end is placed between two rollers which permits a free bending movement.
During each test cycle, the pierced area of the specimen is bent freely over a 10 mm Ø rod through a 90º angle. The growth of the cut, propagated by the pierced area, is then measured, either as a function of the actual final length of the cut over a specific number of cycles, or as the number of cycles required to attain a specific percentage of the growth of the cut.
Schematic Diagram of Ross Type Rubber Flexing Apparatus
A — Test Specimen
B — Holder Arm
C — Holder Arm Adjustment
D — Adjustable Top Roller
E — Fixed Lower Roller
F — Supporting Fixed Lower Roller
G — Pierced Area
H — 10 mm Ø Rod (bends specimen 90º)
The Emerson — Ross Type Rubber Flexing Apparatus Model AR2 can test 6 pair of specimens simultaneously. The specimen thickness can range from 3.175 — 6.35 mm (0.125 — 0.500 in). The number of cycles, the frequency of which is 100 cycles per minute, during the test is recorded by a digital counter. The Model AR2 is completely self contained and of a size suitable for benchtop use.
The Model AR6 Emerson — Ross Type Rubber Flexing Apparatus is designed for subnormal temperature tests. The apparatus is identical to the Model AR2, except that those components which are contained within the chamber are manufactured of high chromium content stainless steel to prevent the oxidizing effects of condensation.
The electric gear drive motor is mounted outside of the environmental chamber and connected to the apparatus using a sealed flexible coupling device. The environmental chamber is capable of sustaining temperatures as low as — 22.2 Cº (— 40 Fº) over the entire period of the test.
|Specimen Holders:||6 Station (12 Specimens)||6 Station (12 Specimens)|
|Flexing Speed:||100 ± 5 cycles per minute||100 ± 5 cycles per minute|
|Flexing Angle:||90º Maximum||90º Maximum|
|Counter:||6 Digit Electronic||6 Digit Electronic|
|Power Required:||115 VAC||115 VAC|
|Motor:||1/3 HP, Gear Drive||1/3 HP, Gear Drive|
|Temperature Range:||Ambient||Ambient to —22.2 Cº|
|Dimensions (L x W x H):||780 x 660 x 483 mm | (31 x 26 x 19 in.)||780 x 660 x 483 mm (not including chamber)|
|Net Weight:||20.5 kg (45 lb.)||147.4 kg (325 lb.) (including chamber)|
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