ASTM G65The ASTM G65 Dry Sand Rubber Wheel method was carried out on a Falex Fricon/Wear Test Machine, as illustrated below.

Dry AFS 50-70 Oawa Silica Test Sand (212-300 µm) is fed at a controlled flow rate of 300-400 g/min (the actual rate is measured in the calibraon step) into the contract zone between a rotang rubberrimmed wheel and the specimen. The moistrue of the sand is controlled to less than 0.12% in conducng the tesng (well below the specified 0.5 % level).Test coupons for this test method have dimensions of 25.4 mm x 76.2 mm x (6..35 - 19.05) mm.The rubber wheel is 12.7 mm wide and has a diamThe rubber wheel is 12.7 mm wide and has a diameter of 228.5 mm diameter. The rubber rim hardness is 58-62 Shore Durometer. The wheel rotates at 200 rpm and the rotaon is such that its contact face moves the direcon of the sand flow. The pivot axis of the lever arm lies wihn the plane, which is approximately tangenal to the rubber whell surface, and normal to the horizontal diameter along which the load is applied.The The test duraon and force applied by the weighted lever arm are selected on the basis of the specific wear resistance and the thickness of the material. Condions for the standard procedures specified in the ASTM G65 standard are listed in the Tbale 1

During each test, a constantly replenished layer of sand abrasive is imbedded in the conforming rubber wheel and transported over the test sample. This connuously abrades material from the contact surface. the condions are maintained constant through the test to ensure consistent results.In parcular, the relave humidity inside the closed test chamber is kept below 5% by purging the space with dried compressed air. A posive air pressure was maintained during the test. The me between consecuve test 30 min to allow the rubber wheel to cool to room temperature.Volume Loss MeasurementFor materials whose density (specific density) is known or can be measured accurately using the Archimedes’ method, volume loss is calculated according to weight loss measurement and the material density. For materials whose density specific density) is unknown and cannot be accurately measured. such as overlys/coangs, volume loss is measuresd by using a laser profilometer.The laser pThe laser profilometer used for this purpose is Solarius Viking 3D Laser Profilometer with a vercal resoluon of 0.1 µm.As spulated by the ASTM G65 standard, the wear results are reported as the Adjusted Volume Loss (AVL) which is calculated according to the following formula:

The wheel diameter is measured aer each test.

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