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LDPE

LDPE is a flexible, low-density polyethylene prized for toughness, near-total chemical and moisture resistance, and easy processing. At only about 12 MPa tensile but 400% elongation, it is soft and stretchy rather than rigid, which is exactly what film, squeeze parts, and impact-absorbing components need.

How LDPE machines

Rated 2.5/5, among the harder plastics to machine well. Its softness and flexibility cause it to deflect, smear, and resist clean cutting, so it is rarely machined for precision. Most LDPE parts are molded, extruded, or formed; machining is reserved for rough or non-critical features.

Manufacturing & processing

Dominated by extrusion into film and tubing and by injection and blow molding for flexible containers. It welds and heat-seals readily, which is central to bag and liner manufacture. Its low 60 C service temperature and high chemical inertness define where it fits.

Typical applications

Plastic film and bags, shrink and stretch wrap, container liners, squeeze bottles, flexible tubing, wire and cable insulation, and soft gaskets. Its flexibility and impact toughness at low cost make it the standard for packaging and protective flexible parts.

When to choose it

Choose LDPE when you need flexibility, toughness, and chemical resistance in film or molded squeeze parts at minimum cost. Pick HDPE when you need more rigidity and strength, or PP for living hinges and higher heat. Avoid LDPE for structural, precision-machined, or warm-service parts.

Suitable surface finishes

Common finishes for LDPE: bead blasting, powder coating. Use the finish selector →

FAQ

What is the difference between LDPE and HDPE?
LDPE has a more branched molecular structure, making it softer, more flexible, and clearer, ideal for film and squeeze bottles. HDPE is denser and more crystalline, so it is stiffer, stronger, and better for rigid containers, cutting boards, and structural parts. Choose by the flexibility you need.
Can LDPE be machined?
Poorly. Its softness and flexibility cause smearing and deflection, so it earns a low 2.5/5 machinability and is rarely used for precision machined parts. LDPE is almost always extruded, molded, or heat-formed. If you must machine polyethylene, HDPE cuts considerably better.
Does LDPE resist chemicals?
Yes, very well, rated 5/5. It shrugs off acids, bases, alcohols, and most aqueous solutions and absorbs essentially no moisture, which is why it lines tanks and drums and forms chemical packaging. Its main limits are low strength, low stiffness, and a low 60 C service temperature, not chemical attack.

Property values are typical/nominal for early guidance and vary by temper, grade, supplier and heat treatment. Confirm critical specs against a certified datasheet or with an mfgiq engineer.