2.3.5. Abrasion Test

The abrasion experiments were conducted in a rotary drum abrasion tester (Bareiss Prüfgerätebau GmbH, Oberdischingen, Germany, DIN ISO 4649 [24]) using 10 N static load. Circular samples with dimensions ∅16.1 mm × 4.2 mm were tested. The abrasion resistance index (*ARI*) was calculated by the standard given formula in Equation (1).

$$ARI = \frac{\Delta m\_r \times \rho\_l}{\Delta m\_l \times \rho\_r} \times 100,\tag{1}$$

where Δ*mr* is the loss of mass from the standard rubber test specimen #1 in mg, ρ*r* is the density of the standard elastomer sample #1 in g/cm3, Δ*mt* is the mass loss of the test rubber piece in mg, and ρ*t* is the density of the elastomer test sample in g/cm3.
