Unfortunately, Drs Horrow and colleagues are mistaken. Their regression analysis addresses only the average value for the common duct diameter as a function of age, while the other authors are discussing something elseâthe upper limit of normal value.
POLYFOAM Polyurethane(PUR)/Polyisocyanurate(PIR) is one of the most effective insulation materials commonly available today. It is also extremely versatile and can be used just about anywhere.It helps to keep our buildings cool and our food chilled, it is usually hidden, but you can find it everywhere from sports stadium to hospitals, cold stores to houses. Fire performance-POLYFOAM PUR/PIR is usually used at lower thicknesses than other insulants, so that their heat or fuel contribution to a fire is low compared to other thicker insulating materials. 2  Enhanced compressive and tensile strength at cryogenic temperatures make it resistant cracking.
Unless you specifically know the quality of polyfoam in a mattress comfort layer or quilting, ... it is usually wise to assume that it is a low grade and anything more than about 1 or so should be avoided in either the comfort layers or the quilting above it.t will last longer than the lower density conventional polyfoam, has better compression and performance qualities, it is suitable for use in a comfort layer when used reasonably (layers that are not too thick) or with slightly firmer foam.