Low-Density Polyethylene LDPE
is a thermoplastic made from the monomer. The EPA estimates 5.7% of LDPE (recycling number 4) is recycled. Despite competition from more modern polymers, LDPE continues to be an important plastic grade.
| ASTM or UL test | Property | LDPE | HDPE | UHMW |
|---|---|---|---|---|
| PHYSICAL | ||||
| D792 | Density (lb/in) (g/cm) | 0.033 0.92 | 0.035 0.96 | 0.034 0.93 |
| D570 | Water Absorbtion, 24hrs (%) | |||
| Mechanical | ||||
| D638 | Tensile Stremgth (psi) at 72℉ | 1.400 | 4.600 | 5.800 |
| D638 | Tensile Stremgth (psi) at 150℉ | 400 | 400 | 400 |
| D638 | Tensile Modulus (psi) | 57.000 | 200.000 | 80.000 |
| D638 | Tensile Elongation at Break (%) | 100 | 400 | 300 |
| D790 | Flexural Strength at Yield (psi) | 1.500 | 4.600 | 3.500 |
