Process for the production of spray polyurethane elastomers and the elastomers produced by this process

A polyurethane-forming system suitable for the production of a polyurethane elastomer by spraying comprising:

• a) an isocyanate component having a solids content of from 40 to 80 wt. %, based on total weight of isocyanate component and a viscosity at 25° C. of less than 4,000 mPa·s comprising:
• (i) at least one aromatic polyisocyanate having an NCO content of from 24 to 33%, a functionality of from 2 to 3 and
• (ii) at least one solid filler present in an amount sufficient to obtain the solids content of a)
• and
• b) an isocyanate-reactive component having a solids content of from 40 to 80 wt. %, based on total weight of the isocyanate-reactive component and a viscosity at 25° C. of less than 4,000 mPa·s comprising:
• (i) at least one polyether polyol having a hydroxyl number of from 25 to 40 and a functionality of from 2 to 4, and
• (ii) at least one solid filler present in an amount sufficient to obtain the solids content of b)
• wherein the total solids contents of a) plus b) is from 40 to 80 wt. %, based on total weight of the polyurethane-forming system.