What is the material of foam?

1, polystyrene foam, the largest amount. This is the white pollution and disposable lunch box mentioned before.

2, polyurethane foam, there are many kinds of polyurethane foam, some soft and some hard.

3. Rubber-based foams, such as foam tapes, are mainly EPDM and butyl rubber.

4, polyethylene, polypropylene plastic foam.

Bubbles are many small bubbles gathered together. A dispersion system in which insoluble gases are dispersed in a liquid or molten solid. The extended meaning of a bubble is a metaphor for the apparent prosperity and prosperity of something, but in fact it is vain and untrue.