LDPE (Low-Density Polyethylene)
Also called: Low-density polyethylene, PELD, resin code 4
Low-density polyethylene (LDPE) is a soft, flexible polyethylene used mainly for films, bags and liners, and is commonly recycled from film scrap.
Low-density polyethylene (LDPE) is a branched polyethylene made by a high-pressure process. The branching keeps its density low, about 0.91-0.94 g/cm3, and makes it soft, flexible and easy to seal. It carries resin identification code 4.
Recycled forms traded
- Post-industrial film scrap such as shrink and stretch film trims, which is usually clean.
- Post-consumer film and bags, which need washing and sorting.
- Film agglomerate and recycled granules, in natural, milky and mixed colour grades.
Why it matters when buying recycled plastic
- LDPE and LLDPE are often mixed in film scrap; ask for the approximate blend if your process is sensitive.
- Gels, unmelted particles and printing ink residue can cause holes in thin film. Ask for a sample run on your line.
- Check MFI (usually 190 C / 2.16 kg) and moisture, since washed film can hold water.
Common uses
Carry bags, shrink and stretch film, liners, agricultural film, lamination, tubing, garbage bags and moulded lids.
When requesting quotes, state the film thickness and product you plan to make, so suppliers can offer a grade with suitable flow and cleanliness.