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better than polyethylene. The disadvantage is the low temperature impact resistance, easier to aging. Bags color is generally white or gray, non-toxic, tasteless, human bodily injury is generally small, although it is manufactured by a variety of chemical plastic made, but its strong environmental protection and recycling larger effort; and very versatile, mainly used for various items to be mounted and packaging, widely used in industry; plastic bags are polypropylene resin as the main raw material, extrusion, stretching into the flat, and then by weaving, bag made; composite plastic is plastic

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