Mondur 501 is an isocyanate-terminated polyester prepolymer used in various applications. Mondur 501 offers properties like light yellow viscous liquid appearance, specific gravity of 1.20, flash point of 207°C and freeze temperature between 13 to 18°C. It has NCO content between 18.7-19.1% and viscosity between 1050-1450 mPas. Mondur 501 can be used in the formation of elastomers, microcellular structures and semi-flexible materials. Some key benefits of Mondur 501 include its ability to provide integral skinning and flexibility in final products. It can also impart microcellular structure in shoe soles and other materials. Mondur 501 is suitable for applications requiring elastomeric properties, flexibility and microcellular structures.