Goodrich flexometer

It can be concluded from this study that Perkalink 900 can be used as a cross-linker in XllR and could provide the additional advantages such as, better high-temperature compression set and lower heat built up in Goodrich Flexometer test over HVA-2. 

FIGURE 14.19 Goodrich flexometer heat buildup at 100°C after 30 min (load 108 N, stroke 4.45 mm, frequency 30 Hz). 

The important vulcanizate properties demanded by this application, low heat buildup, and low dynamic set have been determined in the Goodrich Flexometer test. The compound containing the antireversion agent exhibits a marked decrease in heat buildup and dynamic permanent set (Figures 14.21 and 14.22). 

A servo hydraulic dynamic fatigue machine can, clearly, be used for testing under constant strain as well as constant stress conditions and this would be preferable to the traditional mechanical instruments. Interestingly, a comparison has been made of dynamic mechanical properties measured on a new version of the Goodrich flexometer and a servo hydraulic tester48. 

DBP adsorption (Pre-compresseda) cc/lOOg Resilience (Yerzley method) % Heat rise (Goodrich flexometer) °C... 

For deformation in flexure, the relevant loss functions are E" and D". The relation of E" to the steady-state temperature rise AT in continuous cyclic deformation as measured in a Goodrich flexometer, taking into account nonlinearity of response and the effect of added filler in a rubbery polymer, has been studied extensively by Maekawa, Ninomiya, and collaborators. A simplified equation which satisfactorily represented many experimental results is... 

As would be expected, the mercaptosilane increases the modulus and tensile to values comparable to those of the carbon black compound. In the Goodrich flexometer test, the heat buildup, which is known to be a rather severe problem, is 27°C, which is well below the value obtained with caibon black. The mercaptosilane also improves the compression set and the Pico Abrasion Index. Significantly, the Road Wear Index was improved to give equivalency to the carbon black compound. 

Table 10.9 Goodrich Flexometer of Various DuPont Hytrel Thermoplastic Copolyester Elastomers ASTM D636...

The Goodrich Flexometer is used for heat buildup testing (ASTM D-623). A cylindrical test specimen is alternately compressed and then released in rapid cycles for a specified period of time. The temperature rise within the test specimen is recorded. Additional data obtained are permanent set and static compression. The Goodrich Flexometer Test is sometimes called the Compression Fatigue Test, because the test specimen is fatigued, or weakened, by the rapidly cycling compression stress. 

Goodrich Flexometer heat build up at 100 °C after 30 minutes - tests on conveyor belt cover compounds... 

Goodrich Flexometer blow-out at 100 °C - tests on tank pad formulations (Load 216 N, Stroke 4.45 mm. Frequency 30 Hz, test time 60 )... 

Goodrich Flexometer Dynamic Permanent Set at 100 °C after 120 minutes - tests on NBR oil seal formulations... 

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