Quality Control Practices Test Methods Specific to this Standard Practice Items needed in preparation for determining metal content, fiber content and bulk density for the particulate rubber test samples. 1. Nonmagnetic surface or container capable of holding a 100 g rubber sample 2. Small horseshoe magnet 3. Digital scale with tare function, with a sensitivity of weighing at a minimum of 0.1 g 4. Assortment of stiff bristled cleaning brushes 5. Cylindrical Container, 1,000 cm3, having uniform height and no pouring lip or deformation of the walls of the container 6. Straightedge or Spatula, at least 150 mm in length Determination of Metal Content 1. Weigh out a 100 g +/- 0.1 g sample of recycled vulcanizate particulate rubber to be tested. 2. Place the 100 g sample on a flat nonmagnetic surface or container. Drag a small horseshoe magnet over and through the specimen for 60 seconds. 3. Place a clean nonmagnetic weighing tray on the scale and press the tare button. The scale should display zero. 4. Using a stiff bristled nylon brush, clean the metal fragments off the magnet into the weighing tray. 5. Weigh the metal fragments to the nearest 0.1 g. The mass represents the percentage of free ferromagnetic metal in the sample. 6. Report the result to the nearest 0.1 g.
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