What is Open Foam versus Closed Foam?
Open-cell foam is soft – like a cushion. The cell walls, or surfaces of the bubbles, are broken and air fills all of the spaces in the material.
Closed-cell foam has varying degrees of hardness, depending on its density. It is strong enough to walk on without major distortion. Most of the cells or bubbles in the foam are tight like a soccer ball or a kids pool noodle.
What Is Foam Density?
Foam density is a specific measurement of how much weight in pounds Polyurethane foam can handle per cubic foot. This density rating tells you the strength of the foam. The height is the number that tells you how much longer the foam will last. It should not be used exclusively as a sign of durability or comfort; because firmness and lifespan of foam products like mattresses and cushions, depend on many factors, including density.
What is ILD or IFD?
ILD or IFD is the measurement firmness of how hard or soft the foam is. The higher number the foam is, the firmer the foam is. Also represents how many pounds the foam will hold before it collapses. For example, for a block of 12” x 12” x 12” foam cube, after the certain ILD is reached that foam will collapse.
What are Peak and Base?
Refers to convoluted or “eggcrate” foam. “Peak” is defined as the distance between the bottom surface and the top of the points of foam. “Base” is defined as the distance (or, the thickness) from the bottom surface to the lowest point in the valley between two peaks of foam.