What is the difference between HDPE and LDPE film?

When choosing plastic films for packaging or other applications, it is important to understand how the properties of HDPE (High-Density Polyethylene) and LDPE (Low-Density Polyethylene) differ from each other. Both are polyethylene grades, but differ in production method, molecular structure and hence properties and applications.

How LDPE and HDPE are produced

LDPE:

• • Production: Produced under high pressure.
  • Structure: Has many side branches in the molecular chain.
  • Features: These side branches make LDPE flexible and elastic.

HDPE:

• • • Production: Produced under low pressure.
    • Structure: Has a linear molecular structure with few or no side branches.
    • Features: This structure makes HDPE stronger and stiffer than LDPE.

Different properties of LDPE and HDPE

Applications of LDPE and HDPE films

The differences in properties determine which applications LDPE and HDPE are suitable for:

LDPE applications:
LDPE is often used in applications where flexibility and shrinkability are important. Examples include:

• • Shrink films: Due to the side branches in the molecules, LDPE can shrink both lengthwise and widthwise.
  • Packaging film: For example, for food packaging where stretchability and flexibility are needed.
  • Tarpaulins: Thanks to its flexibility and tear strength in transverse direction.

HDPE applications:
HDPE is more suitable for applications where rigidity and low water vapour permeability are needed. Examples include:

• • Rubbish bags: Due to its high strength and rigidity.
  • Food packaging: Where barrier properties are important.
  • Industrial applications: For example, in technical packaging or protective coatings.

Environmental aspects: HDPE and LDPE in recycling

Both HDPE and LDPE have excellent recyclability and play an important role in circular packaging solutions. At KIVO, both materials are used in recycling processes to produce new, high-quality packaging materials. In doing so, we help customers meet stricter environmental requirements and contribute to a lower carbon footprint.

• LDPE recycling: Because of its flexibility, recycled LDPE is often suitable for applications such as new films or bags.
• HDPE recycling: Recycled HDPE is often used in stiffer applications such as jerry cans or technical packaging.

How do you choose between HDPE and LDPE?

When choosing the right film, it is important to consider the specific requirements of your application. Think about:

1. Strength and flexibility: Do you need a strong and rigid film, or rather a flexible one?
2. Water vapour permeability: Should the film provide a good barrier against water vapour?
3. Shrinkage capacity: Is multi-directional shrinkage necessary?
4. Environmental requirements: What level of recyclability is desired?

Our experts at KIVO are ready to help you make this choice.