Original Cerchar abrasiveness index tester LEOCAI70/ASTMD762510

The LEOCAI70 accurately determines the rock abrasivity index (CAI) employed for the classification of rock materials in terms of abrasivity. The CAI is a dimensionless unit obtained from measuring the wear on a HRC55 Rockwell Hardness steel stylus tip after it has been used to abrade a specimen with a 70N normal force. This instrument follows the ASTM D7625 method for determining the rock abrasiveness. The apparatus comprises a stationary stylus, a deadweight (70N) placed on top of the stylus.

An articulated axis allows the user to place the stylus on the specimen. Then the movement of the axis will produce a reproducible stripe of length 10mm. The movement of the test is made by the operator at a speed of 1mm/second. Options include an indenter visualization system, spare indenters and a sharpening tool. The former encompasses a digital camera with indenter support and inspection software to reveal the wear amount which is then correlated to the abrasiveness index (CAI). The sharpening tool rapidly sharpens a worn stylus for subsequent scratch tests.