Test Method - Page 3 Test Method Particle Size Distribution of Recycled Rubber Step 1: Select the Test Sieve Screens (Continued) 1.1 Select test sieve screens appropriate to the particle size distribution of the product being tested. The customer and manufacturer determine what is acceptable as a particle size for the product or use. We selected ASTM D5603-19 standard particle size 2.0 mm (10 mesh) to use as the example for testing. Once tested, the results recorded should show that the top screen 3.4 mm (6 mesh) has zero material retained in the top screen 3.4 mm (6 mesh) and not more than 5% of material in the 2.0 mm (10 mesh) sieve tray/pan to pass. It is optional rather to use two or six sieves when testing. We used the following six sieves for the test: 3.4 mm (6 mesh), 2 mm (10 mesh), 1.7 mm (12 mesh), 1.4 mm (14 mesh), 1.2 mm (16 mesh) and 1.0 mm (18 mesh). 1.2 Verify each sieve screen is clean. 1.3 Start stacking with the 200 mm (8 inch) receiver pan on the bottom. Then add two rubber balls or two plastic rings to each of the six sieve trays above the receiver pan. This is the standard to use the rubber balls or plastic rings if 425 mm (40 mesh) and coarser. The sieve trays are stacked in order of increasing mesh size with lower sieve size number on the top and the higher sieve size number on the bottom. Step 2: Preparation of Specimen 2.1 Obtain approximately 150 g to 200 g of vulcanizate particulate rubber from the lot. 2.2 Place an empty measuring cup on the digital scale. Press tare feature and the scale display should show zero. 2.3 Use the glass container or metal measuring to weigh 100 g of specimen to the nearest 0.1 gram. 2.4 Transfer the 100 g specimen into the open mouth glass jar.
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