What does density mean and how does it relate to high density urethane?
Density is a standard term for determining the weight of a cubic foot of material, and material. A cubic foot is a cube that is 12″ x 12″ x 12″. Its weight is the density. The higher the density the thicker the cell wall and the tougher and heavier it is. Thicker cell walls means it takes more pressure to crush the cell wall. Heavier means there is more material in its makeup so it costs more. The only physical difference between a 4 pound density PB and a 40 pound density PB is the thickness of the cell wall. The cell wall thickness only determines toughness and has no affect on its weatherability, solvent resistance, etc.
