Facts on Flammability

Slide 22 of 37

As we just discussed, composition, mass and physical structure of the filling and cover fabric greatly impact performance. And for FPF there are more considerations. The relative amount of ethylene oxide and propylene oxide in the polyol component and the presence or absence of copolymer of styrene acrylonitrile impact melt and burning behavior. The diisocyanate which traditionally in this country has been TDI can be modified with blends of pMDI or the foam can be made with only pMDI. This also impacts melt and burning behavior. Adding plasticizers either for softening or as combustion modifiers affects burning, as does the density and total weight of the cushion. Cell size, cell uniformity and air permeability have a major affect on burning particularly in horizontal testing.

Fiber and fabrics share similar considerations. Natural fabrics behave much differently than do synthetics. Natural fabrics may leave a char layer and synthetic fabrics may melt on exposure to heat. The physical characteristics of the fabric and the component fibers themselves all must be considered.