3.2 Blowing agents. For the investigation of foaming and vulcanization behavior of the rubber compounds, water-loaded silica (Ultrasil 360) is incorporated into the EPDM and NBR rubber compounds (Table 5 and Table 6) on a roller mill of type MT 8″ × 20″ of Rubicon Gummitechnik und Maschinenbau GmbH, Halle/Saale, Germany. As Silica the precipitated
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