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  2. Low-density polyethylene - Wikipedia

    en.wikipedia.org/wiki/Low-density_polyethylene

    LDPE has SPI resin ID code 4 Schematic of LDPE branching structure. Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene.It was the first grade of polyethylene, produced in 1933 by John C. Swallow and M.W Perrin who were working for Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization. [1]

  3. Polyethylene - Wikipedia

    en.wikipedia.org/wiki/Polyethylene

    The plastic type which releases gases at the highest rate is low-density polyethylene (LDPE). Due to its low density it breaks down more easily over time, leading to higher surface areas. When incubated in air, LDPE emits gases at rates ~2 times and ~76 times higher in comparison to incubation in water for methane and ethylene, respectively.

  4. Linear low-density polyethylene - Wikipedia

    en.wikipedia.org/.../Linear_low-density_polyethylene

    Linear low-density polyethylene (LLDPE) is a substantially linear polymer (polyethylene), with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain olefins. Linear low-density polyethylene differs structurally from conventional low-density polyethylene (LDPE) because of the absence of long chain ...

  5. Recycling codes - Wikipedia

    en.wikipedia.org/wiki/Recycling_codes

    Plastic milk containers, plastic bags, bottle caps, trash cans, oil cans, plastic lumber, toolboxes, supplement containers [a] 3 PVC Polyvinyl chloride: Window frames, bottles for chemicals, flooring, plumbing pipes [a] 4 PELD or LDPE Low-density polyethylene: Plastic bags, Ziploc bags, buckets, squeeze bottles, plastic tubes, chopping boards ...

  6. Resin identification code - Wikipedia

    en.wikipedia.org/wiki/Resin_identification_code

    Low-density polyethylene, Linear low-density polyethylene: Plastic bags, six-pack rings, various containers, dispensing bottles, wash bottles, tubing, and various molded laboratory equipment LDPE is not often recycled through curbside programs and is a significant source of plastic pollution. LDPE can often be returned to many stores for ...

  7. Plastic shopping bag - Wikipedia

    en.wikipedia.org/wiki/Plastic_shopping_bag

    The polyethylene used in most plastic shopping bags is either low-density (resin identification code 4) or, more often, high-density (resin identification code 2). [19] Color concentrates and other additives are often used to add tint to the plastic. Plastic shopping bags are commonly manufactured by blown film extrusion. [18]

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