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| TESTING: ABRASION RESISTANCE | |
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URETHANE ELASTOMERS AND WET, FINE-PARTICLE ABRASION Since the primary abrasion type to which urethane elastomers are subjected is wet, fine particle, impingement abrasion (wet or damp coal, sand, ore, etc.), Technical Urethanes reports the abrasion resistance of its products using the Sand Slurry Abrasion Test, the most relevant, accurate, and reliable test for this type of product and abrasion. Technical Urethanes does not use theTaber tests, as they are designed to measure the abrasion resistance of hard materials against dry, sliding abrasion, and are not relevant to soft materials or wet, fine particle impingement abrasion. For more information, see the ASTM Taber test descriptions. The general concept of the the Sand Slurry test is that it measures the amount of abrasion a material receives from an abrasive solution made up of coarse sand and water. In the test, equal size bars of the test material and steel are rotated at high speed in a 50% sand / 50% water mixture for several hours. The amount of abrasion of the test material is compared to the amount of abrasion of the steel control, with the value of the test specimen being a relative value compared to the steel. Steel is arbitrarily assigned a value of 100, so a product with 20% the loss of steel would be a 20 in comparison to steel, and indicates an abrasion resistance 5X that of steel. An added advantage of the Sand Slurry Abrasion Test is that it can be modified to test the actual conditions of a specific application. For instance, if you need to know how TECHTHANE 180 compares in fine coal abrasion to 304 stainless steel, coal can be substituted for the sand, and 304 stainless for the carbon steel. (For reference, its about 25X better.) In over 17 years of use by Technical Urethanes, actual field service results have proven the Sand Slurry Abrasion Test to be a reliable indicator of a material's actual service performance. Technical Urethanes also certifies that it performs the Sand Slurry Test in accordance with its strict guidelines. For reference, ignoring or overlooking some requirements such as complete drying of the test specimen after the test will give artificially good scores. Technical Urethanes invites any properly set-up facility to verify our results.
| Sand Slurry Abrasion Test
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© 1998 Technical Urethanes, Inc.
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