All seats and backs meet the California 117 fire code. In Massachusetts and other areas where required, we purchase foam that will meet California 133 fire code. A lightweight cellular material resulting from the introduction of gas bubbles into a reacting polymer. The weight of a cubic foot of foam.
Density is independent from firmness.
Density is considered the most important indication of overall foam quality. Higher density foam is less likely to bottom out, fatigue, or dish. Higher density virgin foam cores can be designed to provide plush surface softness without taking away comfort. IFD is a measure of load bearing capacity or firmness. Ideal IFD specification will depend upon the application.