Surfactant-free filled polyurethane foam and method of making same

A filled polyurethane foam comprising:

• polyurethane;
• and
• from 50% to 80% by weight, based on a total weight of the filled polyurethane foam, of an inorganic particulate filler comprising calcium carbonate;
• wherein the filled polyurethane foam has a flexural strength ranging from 400 psi to 1400 psi, a density ranging from 10 lb/ft3, to 35 lb/ft3, or both a flexural strength ranging from 400 psi to 1400 psi, a density ranging from 10 lb/ft3, to 35 lb/ft3.

A filled polyurethane foam comprising:

• polyurethane;
• from 50% to 80% by weight calcium carbonate, based on a total weight of the filled polyurethane foam;
• and
• from 3% to 5% by weight fiber glass, based on a total weight of the filled polyurethane foam.