LDPE is a popular type of plastic known for its flexible and squeezable properties that make it perfect for dispensing liquids and more without breaking. As a result, it’s widely used within pharmaceutical packaging and a diverse range of other industries for many applications. But what exactly is LDPE, and how does it provide these benefits? Origin explains…
What Is LDPE?
LDPE is a lightweight and flexible plastic that can be squeezed without breaking or compromising its structure. It’s commonly used in a range of packaging containers, including bottles, tubes and tubs.
The plastic was first produced in 1933 by Imperial Chemical Industries (ICI). It is used in a range of industries for a variety of products, ranging from corrosion-resistant work surfaces to playground slides or even bulletproof vests. Primarily, though, LDPE materials are used for plastic bags, containers, and packaging.
The term LDPE is largely defined by its density range, which sits between 0.917–0.930 g/cm3. As with all types of Polyethylene (PE), it is a lightweight synthetic resin made from the polymerisation of ethylene and a crystalline non-polar thermoplastic that can be melted and reshaped with ease.In 2024, the LDPE market was valued at $47.2 billion and is expected to climb to $72.6 billion by 2034, showing annual gains of 4.5%.
What Does LDPE Stand for?
LDPE stands for Low-Density Polyethylene, which refers to the molecular structure of the plastic. In comparison to high-density polyethylene (HDPE), LDPE has a more branched molecular structure, which gives it a lower density and greater flexibility. As a result, it’s a highly versatile material that’s used when both flexibility and durability are needed.
What Are the Benefits of LPDE Plastic?
It’s a popular material in pharmaceutical packaging for its durable, flexible and corrosion-resistant properties. Some of the key benefits of this plastic for the pharmaceutical packaging industry include:
- The material is not reactive at room temperature.
- It can be safely kept at temperatures of 80 degrees Celsius or even 90 degrees Celsius for short periods of time.
- It is highly resistant to acids, alcohols, bases or esters.
- It has good resistance against aldehydes and ketones.
- The material’s low density allows it to break down with ease over time, offering a greater surface area.
- It is a non-toxic, non-contaminating material that’s resistant to moisture and impact, boasting impressive toughness.
- It can be made either transparent or opaque, offering privacy where needed.
LDPE is also a readily available packaging material that is affordable and can be produced in a range of sizes for the storage of various pharmaceutical goods, ensuring that it will remain one of the most popular solutions for a long time to come.
What Is LDPE Used for?
LDPE plastic is commonly used in pharmaceutical packaging as a result of the above benefits. Specifically, they are often used for LDPE bottles that can store a range of liquids, powders and substances. They are often used for eye medicines, nasal sprays and liquid medications, as these bottles are squeezable for easy application.
Within other industries, LDPE is used to produce plastic wrap, tubes and tubs, plastic bags and a variety of other items as a result of its flexibility, durability and low cost.
What Is the Difference Between LDPE and HDPE?
Both types of PE material are ultimately defined by their density range, as LDPE has an average range of 917-930 kg/m³, while HDPE’s is generally between 930-970 kg/m³. LDPE’s lower density range makes it suitable for applications requiring a balance of flexibility and durability. Meanwhile, HDPE is harder and melts at a higher temperature, though it is more rigid.
These materials both have their unique properties that make them more preferable. For example, the flexibility of LDPE as well as its affordability make it a suitable option for applications such as squeezable bottles. However, the increased durability of HDPE bottles as well as their resistance against UV rays means they’re ideal for providing secure protection for a variety of medications.
So, whether HDPE or LDPE is better for pharmaceuticals often depends on the specific attributes required for the application, as both have their advantages and disadvantages.
Is LDPE Recyclable?
One of the key benefits of LDPE is that it is widely recyclable, making it the ideal choice for sustainable pharmaceutical packaging. Compared with many alternative plastic packaging solutions, it proves environmentally friendly and, in most forms, can be recycled using specialist equipment.
For consumers, LDPE products will feature a #4 logo on them to help indicate that it is recyclable. However, some kerbside recycling programs may not accept it in some instances, so it is important that users check before they recycle.
How Is LDPE Recycled?
Firstly, LDPE products must be separated by their density – for example, cling film and thicker, more rigid bottles. Coloured LDPE products are also typically separated to be recycled individually.
These products are then ground into flakes, cleaned to remove any impurities, and then melted. The plastic then hardens into pellets – a form that makes it easy to store and transport – before being melted again when they come to be reused.
Recycled LDPE is often used to create ‘Linear LDPE’ – a slightly less pure form of the plastic – in products such as film and plastic bags. It may be mixed with virgin LDPE in this process.
LDPE Packaging Solutions From Origin
Origin is an industry leader in pharmaceutical packaging, offering a range of LDPE bottles designed to safely store a range of healthcare and medical products, including liquids, powders and tablets. If you’d like to find out more about the different types of plastics and about pharmaceutical packaging in further depth, you can find more useful articles on our pharma packaging blog.
To find out how we can work with you to develop bespoke packaging solutions, chat with our expert team today.
