... rubber material, polyester cord as framework material. wrapped v belt classical v-belt uses NR,SBR or CR as main rubber material ... according to the standard of GB/T11544 or ISO4184.The belt has the excellence of larger transmission efficiency,small elongation,and ... the excellent feature of oil-proof,heat-resistance,wearing resistance.K, M, A, B, C, D, E, 3L, 4L, 5L,SPZ ...