The hardness of the rubber conveyor belt is related to wear resistance. Generally the hardness is between 50-70. So, is the harder the better? Of course not, it should be based on the performance requirements of the rubber belt and the conveyed materials.
If the material to be transported is stone, sand, coal, or hard material, it is better to be harder, because the hardness is higher, the wear resistance is stronger, and the service life is longer.
If it is a hot material and has sharp edges and corners, it needs to be softer, so as to cushion the impact on the belt. The softer means that the thermal expansion and contraction performance is better and the service life is longer.
Hardness is one of the properties used to characterize rubber. IRHD hardness scale and Shore hardness scale are widely used. The two test methods use completely different indenter, forces, test times and procedures.
IRHD testing is usually non-destructive, making it the preferred method for finished product inspection. The test takes 35 seconds.
In contrast, the Shore hardness testing is often destructive (leaves permanent indentations), but the test only takes 1 to 3 seconds.