Elastomeric polyurethane-polyurea comprising water blown foam having improved mechanical properties

An elastomeric polyurethane-polyurea comprising water blown foam having an apparent density in the range 30-700 kg/m3 measured according to ISO 845 and having a tensile strength (measured according to DIN 53504) over apparent density ratio of at least 10 kPa·m3/kg and wherein the foam has

• Optionally urethane hard-block species formed from D equivalents urethane forming isocyanate reactive species having hydroxyl functional groups and a molecular weight <500 g/mol, and
• Optionally urea hard-block species formed from E equivalents urea forming isocyanate reactive species having amine functional groups and a molecular weight <500 g/mol, and
• Urea hard-block species formed from C urea forming equivalents of water
• such that the total number of urethane and urea hard-block species formed from D equivalents urethane forming isocyanate reactive species and E equivalents urea forming isocyanate reactive species over the total number urea of hard-block species from formed from C equivalents water is smaller than 1.4 and calculated as
• D
• +
• E
• C
• .