DIN Abrasion Testing is one way to find out how resistant rubber is to wear. Tires, soles, and conveyor/drive belts are the main samples used for this test.
In real life, tyres, conveyor belts, and transmission belts are put through a lot of stress. During their service life, these materials must be able to stand up to abuse and wear. The DIN Abrasion test is also useful for evaluating hoses and rubber floor coverings.
Before these materials are made in large quantities, the DIN abrasion test method makes sure they are safe. Materials that last a long time are also a sign of better quality. The DIN Abrasion test is not a perfect way to figure out how resistant a rubber material is to wear. But it gives a close approximation of it.
How Din Abrasion Tester Works?
The Rubber Abrasion Tester is a device made up of just a few parts:
It has a drive system, a cylindrical drum that turns, and a test piece holder that moves.
The drive system has switches that can be used to turn the machine on and off. Some testers have a way to count how many times the drum turns. Some also have switches to reset and adjust.
The test piece holder is attached to a sledge and a rotating arm. The holder for the test piece can also hold calibrated weights. The test piece and cylindrical drum are both pulled down by these weights.
The holder for the test piece can move side to side along the entire length of the drum. It can also turn on its own axis while the cylindrical drum is turning.
The DIN Abrader is different from other abrasion testers because it has these features. In other machines, a fixed holder for the sample will be pressed against the rotating drum.
The scraps from the Rubber Abrasion Test fall into a tray at the bottom of the DIN Abrader.
During testing, the operator must follow the rules set out in the following standards: ASTM D5963, DIN 53516, ISO 4649, BS-903
These standards include ways to test the resistance of rubbers and elastomers to wear. The Rubber Abrasion Tester must also meet these standards’ requirements.
The ISO 4649 Abrasion Standard has taken the place of the older DIN 53516 standard. But the DIN 53516 Abrasion Standard is still useful and is used to make sure things are done right.
Some of these standards have test methods and requirements that are the same. But the test has different requirements and uses different materials.
The ASTM D5963 Abrasion Standard and DIN 53516 say that the test piece only needs to be pressed against the drum with 10N. But the ISO 4649 Abrasion Standard lets you decrease the force by 5N or increase it by 20N in certain situations.
The BS-903 Abrasion Standard is a standard set by the British. It tells how to test and choose vulcanised rubber and other rubber products.
The Procedure for the Rubber Abrasion Test
Using a test piece cutting tool, an operator gets the sample ready. The sample is in the shape of a cylinder and must fit well into the test piece holder.
The operator cleans the adhesive sheet before testing begins. This is to make sure that all tests are the same.
When the machine is turned on, the operator uses a brush to clean the surface of the rotating cylindrical drum. This will also get rid of old test debris. The operator will sometimes use a safety blow gun to clear out the junk.
The operator now lifts the swivel arm to put the test piece in the holder and secure it. If necessary, he or she can add calibrated weights. Sometimes, test pieces need to be heavier to put more force on the rotating drum. When the abrasive sheet is clean and the test piece is in place, testing can begin.
The test starts when the operator moves the holder for the test piece back to the starting position. After the machine is set, the operator starts it up.
The test piece then moves through the drum that is turning. The operator must make sure that the test piece holder is not shaking. Any vibrations could make the results wrong.
After the test piece has been worn for 40 metres, the machine stops. This is about 84 turns for the cylinder drum that is turning.
Using a test rubber compound and a standard rubber, the operator runs a series of tests. The operator also needs to do tests with test pieces that move and ones that don’t.
The Standards tell the operator exactly how many tests they need to do. The Abrasion Standards also tell you how to get the test pieces ready.
Din Abrasion Test Results
After the test, the operator measures the volume lost in the test and standard compounds. He uses the data to calculate the abrasion resistance index. Less volume loss means that the wear resistance is better.
But a lower index means that the rubber won’t wear down as well. Refer to the DIN Abrasion Tester Operational Manual for a full description of how the system works.