2. Polyurethane foam (PU) can be divided into soft foam and hard foam, which are actually widely used. Soft foam only knows sponge. People often say that PU leather and environmental protection leather have soft foam components, and there are many hard foams. As some people say, polyurethane soles, car interiors, refrigerators and freezers at home, and some safety doors all have hard foam filling parts. It seems that polyurethane is also used for pipe insulation. Personally, I think polyurethane color steel composite plate has the best thermal insulation effect, and the appearance effect of the plate is good (referring to flatness and construction fit), but the price is small and expensive. In addition, although it is more fireproof than polystyrene board, it is not as good as glass wool and rock wool.
3. I don't know much about extruded board (XPS), which seems to be different from polystyrene board (I only made a small difference in appearance, EPS white and XPS color). It seems that it is not widely used in color steel sandwich panels, and most of them are used in building external wall insulation systems. Without knowing its performance, we dare not jump to conclusions.
4. The fire resistance of rock wool and glass wool seems to be Grade A, and polyurethane can reach Grade B 1 if isocyanate is used as PUR component. However, the installation effect of color steel sandwich panel with rock wool and glass wool is not very good, and the insulation effect is not as good as that of polyurethane. In addition, the quality of cotton varies widely. In short, the weight is large, the composite effect is not ideal, and the price is relatively high, if there is no fire rating requirement.
I know a little about fur, and it is inevitable that something will go wrong. Don't spray passing prawns, quack! Remember to give points, your typing is getting sour!