LDPEä

LDPEä is a term encountered in some European markets and product catalogs that refers to low-density polyethylene (LDPE). It is not part of the official polymer nomenclature and may be used as regional branding or stylistic variation for standard LDPE.

LDPE is a thermoplastic polymer produced by high-pressure free-radical polymerization of ethylene. The polymer chains are highly branched, which prevents tight packing and results in a relatively low density, along with flexibility and toughness. This structure gives LDPE distinct properties compared with higher-density polyethylenes.

Key properties of LDPE include a density of about 0.91–0.94 g/cm3, a melting point around 105–115°C, good impact strength, and relatively good chemical resistance to many household substances. It offers excellent clarity and flexibility but lower stiffness than HDPE. LDPE also has good electrical insulation properties and is relatively easy to process into thin films.

Processing and applications

LDPE is widely processed into thin films by extrusion and blown-film methods, making it common for packaging films, shopping bags, bread bags, and other flexible wrap. It is also used for liners, coatings, tubing, and some molded items, though its flexibility can limit rigidity in certain parts. The resin can be blended with additives to modify optical properties, UV resistance, or aroma barriers for specific applications.

Recycling and environmental aspects

LDPE is widely recyclable, typically assigned resin code 4. It is commonly accepted in curbside programs and drop-off facilities, though recycling availability varies by region. LDPE is not compostable and should be recovered through mechanical recycling when possible to reduce environmental impact.