Answer: Because the physical and chemical properties of polyethylene (PE) ingredients are easy to be photo-oxidized, thermally oxidized, and decomposed by ozone, and are easily degraded under the action of ultraviolet rays, ordinary PE pipes are not suitable for use in open fields. Due to the addition of anti-aging agents, the PE pipes for drip irrigation can have a service life of more than 10 years under open ground conditions.
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