| 摘要 |
PROBLEM TO BE SOLVED: To provide a wet friction material exhibiting higher durability.SOLUTION: There is provided a wet friction material manufactured by heating and drying a resin impregnated paper-making body where an impregnation liquid which is a thermosetting resin dissolved in a solvent, is impregnated into a paper making body from a fiber, the impregnation liquid has a viscosity within a range of 5 to 8 cP at a liquid temperature of 18°C to 25°C when a nonvolatile content is 50%. |
