The paper aims to determine the influence of alkaline treatment of cantala fiber on the flexural strength of composite friction brake. The specimens were composed of cantala fiber, phenolic resin, NBR powder, graphite, fly ash, cashew dust, molybdenum disulfide (MoS2), and calcium carbonate (CaCO3). The research method used was compression molding to manufacture specimens using cantala fiber of 0%, 4%, 8%, and 12% volume without alkaline treatment or with alkaline treatment. The alkaline treatment was carried out by soaking the cantala fiber in an alkaline solution (5% NaOH) with a soaking time of 4 hours. The results showed that alkaline treatment on the cantala fibers increased the strength and Young modulus of composites particularly at 4% and 8% volume of fiber.
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