High-Density Polyethylene (HDPE) Datasheet
Chemical Structure:
- Polymer Type: Thermoplastic polymer
Physical Properties:
- Density: 0.95 – 0.97 g/cm³
- Melting Point: 120 – 130°C (248 – 266°F)
- Water Absorption: < 0.01%
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | 28 – 34 MPa (4,000 – 4,900 psi) |
| Yield Strength | 18 – 26 MPa (2,600 – 3,800 psi) |
| Elongation at Break | 10 – 20% |
| Young’s Modulus | 900 – 1,200 MPa (130,000 – 174,000 psi) |
| Hardness (Rockwell R) | 50 – 65 |
Thermal Properties:
- Glass Transition Temperature (Tg): -125°C (-193°F)
- Heat Deflection Temperature (HDT): 49 – 80°C (120 – 176°F)
- Coefficient of Thermal Expansion: 100 – 200 x 10^(-6) /°C
Electrical Properties:
- Dielectric Strength: 17 – 50 kV/mm
- Volume Resistivity: 10^15 – 10^18 ohm·cm
Chemical Resistance:
- Resistant to acids, bases, and a wide range of chemicals.
- Sensitive to some solvents, such as aromatic hydrocarbons.
Low-Density Polyethylene (LDPE) Datasheet
Chemical Structure:
- Polymer Type: Thermoplastic polymer
Physical Properties:
- Density: 0.91 – 0.93 g/cm³
- Melting Point: 105 – 115°C (221 – 239°F)
- Water Absorption: < 0.01%
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | 13 – 17 MPa (1,900 – 2,500 psi) |
| Yield Strength | 7 – 13 MPa (1,000 – 1,900 psi) |
| Elongation at Break | 300 – 700% |
| Young’s Modulus | 140 – 220 MPa (20,000 – 32,000 psi) |
| Hardness (Shore D) | 42 – 58 |
Thermal Properties:
- Glass Transition Temperature (Tg): -125°C (-193°F)
- Heat Deflection Temperature (HDT): 30 – 50°C (86 – 122°F)
- Coefficient of Thermal Expansion: 100 – 150 x 10^(-6) /°C
Electrical Properties:
- Dielectric Strength: 18 – 25 kV/mm
- Volume Resistivity: 10^15 – 10^18 ohm·cm
Chemical Resistance:
- Resistant to acids, bases, and a wide range of chemicals.
- Sensitive to some solvents, such as aromatic hydrocarbons.
Additional Features:
- Machinability: Both HDPE and LDPE are easily machined and fabricated.
- Weldability: Suitable for various welding methods.
- UV Resistance: HDPE has better UV resistance compared to LDPE.
Applications:
- HDPE: Pipes, bottles, containers, toys, and various industrial applications.
- LDPE: Packaging films, squeeze bottles, agricultural films, and various consumer goods.