Process for preparing a moulded elastomeric polyurethane material having
an overall density of 200-1000 kg/m.sup.3, preferably of 200-500
kg/m.sup.3, and a compression load at 40% deflection of at least 25 kPa
by reacting in a closed mould an isocyanate terminated prepolymer, having
an NCO-value of 5-15% by weight and which is the reaction product of a
polyisocyanate and a polyether polyol having an average nominal
functionality of 2-6, an average equivalent weight of 500-5000 and an
oxyethylene content of 50-90% by weight, and water. The elastomer
obtained is claimed as well.