LDPE and LLDPE have similar densities but very different molecular structure. LDPE has long branches; LLDPE has short, regular ones. That difference drives everything about how they run and perform.
Side by side
| LDPE | LLDPE | |
|---|---|---|
| Processing | Easy; low motor load | Harder; higher pressure and load |
| Bubble stability (melt strength) | Excellent | Lower |
| Clarity | Good | Lower (metallocene grades better) |
| Toughness, tear, puncture | Moderate | High |
| Heat sealing | Good | Good to excellent (metallocene) |
| Typical film use | Shrink film, clarity film, coating | Stretch film, liners, heavy bags |
Typical, general comparisons. Individual grades vary; check the data sheet.
Choose LDPE when
- Clarity, easy processing or shrink properties matter most
- Extrusion coating
- You need a blend component for bubble stability
Choose LLDPE when
- Toughness, tear and puncture resistance matter most
- Stretch film, can liners and heavy-duty bags
- You want to down-gauge
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