New formulations utilizing high modulus fibers, such as aramid and ppanox, were developed with the purpose to analyze properties of the composites obtained , important for use in friction materials, as an alternative to the utilization of asbestos containing materials. The effect of the ratio of the high modulus fibers was studied , as well as the effect of the substitution of alumina for the mica with respect to specific properties of the composites. The fabrication of the tablets followed procedures and parameters used for the automotive industry. The physical parameters of interest, determined in the composites were hardness (Gogan), density, shear strength, point of cure, and the coefficient of friction. The results compared favorably with the characteristics of commercial brake pads.15 5561Agarwal, B.D., Lawrence, J.B., (1990) Analysis and Performance of Fiber Composites, p. 1. , New York: A Wiley InterscienceHou, X., Li, H., Shen, J., Wang, C., Zhu, Z., Effects of microstructure on the internal friction of carbon-carbon composites (2000) Materials Science and Engineering A, 286 (2), pp. 250-256. , DOI 10.1016/S0921-5093(00)00798-X, PII S092150930000798XRand, B., High performance carbon materials (1989) HIPERMAT Conference on High Materials, , London, SeptWang, Y., Xia, Y.M., Experimental and theoretical study on the strain rate and temperature dependence of mechanical behaviour of Kevlar fibre (1999) Composites Part A: Applied Science and Manufacturing, 30 (11), pp. 1251-1257. , PII S1359835X99000354Gopal, P., Dharani, L.R., Blum, F.D., Hybrid phenolic friction composites containing Kevlar® pulp part I. Enhancement of friction and wear performance (1996) Wear, 193 (2), pp. 199-206. , DOI 10.1016/0043-1648(95)06723-XMcAllister, L.E., Lachman, W.L., Multidirection carbon - Carbon composites (1983) Handbook of Composites, 4, pp. 111-173. , Elsevier Science PublishersDeterminação da Dureza Gogan de Materiais de Fricção Para Guarnições de Embreagens de Freios, , ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS, Rio de janeiro NBR - 5520Verificação das Características de Fricção e Desgaste das Guarnições de Freios A Disco Através da Bancada de Ensaio Krauss, , ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS, Rio de janeiro NBR - 6143Determinação da Massa Específica Relativa Para Guarnições de Embreagens e de Freios, , ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS, Rio de janeiro NBR - 5544Determinação da Resistência Ao Cisalhamento de Materiais de Fricção, , ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS, Rio de janeiro NBR - 5537Amico, S., Desenvolvimento de compósitos com fibra de PAN oxidada para utilização em freios automotives (1996) Tese (Mestrado) Faculdade de Engenharia Química Universidade Estadual de Campinas