Plastic barriers are hollow plastic structures that are formed from polyethylene. They are manufactured to be lightweight and portable, some gaining additional strength and stability from being filled with water or sand once they are onsite. They are effective for traffic control on highways and around work sites.There are two ways to form polyethylene barriers: blow molding and rotational molding. Blow molding produces high-density polyethylene (HDPE). This material is very rigid, very durable and is resistant to cracks.
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