Test Method - Page 4 Test Method Particle Size Distribution of Recycled Rubber Step 3: Prepare of Flow Agent The flow agent lubricates the the rubber so it can go through the mesh during the sieve shaker process. 3.1 Place empty 500 cm3 glass or metal measuring cup on the digital scale. Press tare feature and the scale display should show zero. 3.2 Measure 5.0 +/- 0.1g of flow agent for designated coarser than 300 µm (50 mesh). Measure 15.0 +/- 0.1g of flow agent for products that are designated 300 µm (50 mesh) or finer. 3.3 Add the flow agent to the specimen in glass jar containing the rubber sample and seal the jar by closing the lid. 3.4 Shake the glass jar for a minimum of one minute until agglomerates are broken and flow agent is uniformly mixed or dispersed. Step 4: Screening the Specimen 4.1 Empty mixture of the rubber and flow agent from glass jar and place on top screen and place lid on top of stack. 4.2 Place the stack in the shaker. 4.3 Turn on the shaker system. 4.4 Activate the shaker for 10 min for products designated coarser than 300 µm (50 mesh). And, for products designated 300 µm (50 mesh) or finer, activate the shaker for 20 min. 4.5 After the shaker completes the appropriate cycle, remove the stack. Step 5: Determine Weight Retained on Each Sieve and Record Results 5.1 Determine the empty weight of empty glass container or measuring cup. Place the glass container or metal measuring cup on the digital scale. Press the tare feature and the scale display should show zero. 5.2 Starting with the top sieve, remove the screened fraction by gently tapping its contents to one side and pour the contents into the glass container or metal cup.
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