PE Polyethylene films
Polyethylene belongs to the polyolefins. Properties of standard polyethylene are: high toughness, very good electrical properties, very low water absorption, low water vapour permeability, high resistance to attack by chemicals, resistance to stress cracking, good processability.
The following 2 types of polyethylene are mainly distinguished:
PE-LD: Low Density Polyethylene/ Low Density
Due to the low density of this polyethylene, it is lighter in weight but has a higher tensile strength and elasticity. The polyethylene is characterised by a soft, tough and flexible property. The melting point is approx. 105 °C.
Advantages of PE-LD films:
- High tensile strength
- Resistant to acids and bases
- Good weldability, shrinkability
PE-HD: High Density Polyethylene/High Density
HDPE has the highest tensile and tear strength as well as the lowest flexibility and vapour permeability. HDPE is mainly used for thin films due to its increased strength. The film has a stiff and crackling feel compared to LDPE. The melting point is approx. 140 °C.
Advantages of HDPE films:
- Thinner films possible
- High water vapour barrier properties
- More resistant to chemicals and heat than LDPE
- Not suitable for materials with high fat content