Low-Density Polyethylene, also known as LDPE plastic, is a soft and flexible polymer. Unlike the High-Density Polyethylene (HDPE) which is known for its high specific strength and heat resistance, the LDPE has a lower density, strength, and temperature resistance in comparison. This lower density and resistance is due to the slight difference in the polybag structure where the LDPE features a higher degree of short and long side-chain branching—manufactured at a high pressure of 1000-3000 bar and a low temperature of 80-300°C. This process is known as Free Radical Polymerisation which is a type of chain-growth polymerisation that takes place when the polymer forms through consecutive additions of unsaturated monomer molecules to an active, free radical centre.
The formation of this plastic material makes it a good polymer with superb processability, has a high impact strength at low-temperature levels, chemical resistance, excellent electrical insulator, good weatherability, low water absorption, and is transparent in thin foil film. Furthermore, it also meets the FDA regulations, making it safe for contact with food products.
Categorised and featured as the number 4 plastic, the primary uses of the LDPE are for film-related applications. Typical products manufactured using this material include food plastic bags, shrink wraps, stretch films, and other forms of packaging solutions. These are made possible due to the physical properties of the plastic material, which provides it excellent chemical resistance against chemicals such as alcohols, dilute acids, and alkalis as well as other elements that include moisture, dirt, dust, oil, and grease. Furthermore, it is also FDA approved, making it safe for contact with food products.
Here in Humi Pak, we also provide other forms of packaging solutions for food products. Further increase shelf life of food with Desiccants and Oxygen Absorbers. Click here to read up on our blogs to find out more about the different products that we offer!