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uid erosion, no mildew borers. 7. Physical resistance. Polypropylene spun bonded directly paved net heat made ??products better strength than the average staple products, the strength of non-directional, vertical and horizontal strength similar. 8. On the environment, the majority of non-woven materials used are polypropylene, polyethylene and plastic raw materials, although the name of the two substances are similar, but are very different in chemical structure. The chemical molecular structure of the polyethylene has a very strong stability is extremely difficult to degrade, so that decomposition of the plastic bag needs to be completed in 300; the chemical structure of polypropylene is not solid, the molecular chains can easily be broken, which can effectively degrade and enter the next cycle in the form of a non-toxic