I am not aware of adding elemental calcium to polyurethane "PU" foams. However, calcium carbonate (CaCO3 ) is a filler often used in such foams. This filler reduces cost upon decreasing the amounts of PU reagents & imparts dimensional stability & hardness to the foams. If excess CaCO3 is used, then this will be counter-productive possibly leading to a new entity with permanent deformation & damage.

Thanks Sir. I am referring to Calcium Carbonate. I am sorry Sir :) But thank you Sir! :)

This is a common method in many countries to reduced the foams price. But it has some problems such as:

Loss of foam quality, Reduced flexibility, Increased risk of production process

and Increase amount of consumer silicone.

Thanks Sir! :)