Yes. Polyethylene (PE) is a thermoplastic material that can be recycled through established mechanical recycling processes. Because PE can be melted and reprocessed, it is widely used in recycling systems for plastic films, packaging and industrial products.
The recyclability of a particular PE product depends on factors such as its material composition, cleanliness, colour, thickness, additives and whether it consists of a single material or several different layers. Clean, sorted polyethylene waste is generally easier to recycle into high-quality secondary raw materials than mixed or heavily contaminated plastic waste.
Recycling polyethylene helps conserve resources, reduce the demand for virgin raw materials and keep valuable plastics in circulation. It is an important part of a circular economy in which materials are recovered and used to manufacture new products wherever technically and economically feasible.
How Is Polyethylene Recycled in Germany?
In Germany, plastic packaging is collected through established waste collection systems, including the dual systems for lightweight packaging. The collected material is sorted and directed to suitable recovery processes.
Modern sorting facilities use a combination of mechanical separation, sensor-based sorting and near-infrared (NIR) technology to identify and separate different plastic types. NIR sensors can distinguish many common polymers, including polyethylene and polypropylene, allowing suitable material streams to be recovered for further processing.
After sorting, the PE waste is typically shredded, washed where necessary, dried and processed through an extrusion and granulation system. The resulting recycled granules, known as recyclate, can be used as a raw material for manufacturing new plastic products.
The quality of the recyclate depends on the purity of the incoming material, the efficiency of sorting and cleaning, and the conditions used during processing. Although modern sorting technology can achieve high material purity under suitable conditions, the actual result varies according to the waste stream and the sorting process.
According to Germany's Federal Environment Agency, approximately 38% of all collected plastic waste in 2023 was mechanically recycled, while around 0.5% underwent feedstock or chemical recycling. Approximately 61% was used for energy recovery. These figures refer to all collected plastic waste, not exclusively polyethylene or plastic packaging. They demonstrate why material recycling remains an important area for further improvement.
Source: German Environment Agency – Plastic Waste Statistics.
How Does Mechanical Recycling of PE Work?
Mechanical recycling is one of the most established methods for processing polyethylene waste. It preserves the polymer as a material rather than deliberately breaking it down into its chemical building blocks.
The process typically involves several stages:
- Collection and sorting: Polyethylene waste is collected and separated from other materials. Where possible, different polymer types, colours and material grades are sorted into suitable streams.
- Shredding: The sorted PE waste is cut into smaller flakes or pieces to facilitate further processing.
- Washing and cleaning: Depending on the condition of the waste, contaminants, labels, residues and other unwanted substances are removed.
- Drying: The cleaned material is dried to prepare it for melting and extrusion.
- Melting and extrusion: The PE flakes are melted and processed through an extruder. Filtration can help remove remaining solid contaminants.
- Granulation: The extruded material is converted into granules that can be stored, transported and used in subsequent manufacturing processes.
- Reprocessing: The recycled granules are used to manufacture new products, either on their own or blended with virgin polyethylene, depending on the application and quality requirements.
The resulting recyclate can be used in many applications, including refuse bags, protective films, construction films, liners and selected packaging products.
However, recycled polyethylene does not always retain the same properties as virgin material. Repeated exposure to heat, oxygen and mechanical shear can cause molecular degradation, potentially affecting tensile strength, elongation, impact resistance and processability. Careful material selection and process control are therefore essential when high performance is required.
Can Polyethylene Be Recycled More Than Once?
Yes. Polyethylene can be mechanically recycled more than once because it is a thermoplastic polymer that can be melted and processed again.
However, this does not mean that it can be recycled an unlimited number of times without any loss of quality. Repeated processing can alter the molecular structure and reduce the performance of the material, depending on its previous use and the recycling conditions.
The number of recycling cycles a PE material can undergo while remaining suitable for a particular application depends on factors such as polymer grade, contamination, processing temperature, oxidation and the required mechanical properties.
In practice, recycling may involve blending recycled polyethylene with virgin material or combining different recycled grades to achieve the required performance. Stabilizers and other additives may also be used where appropriate.
The objective is to retain as much material value as possible and keep the polymer in productive use for as long as technically feasible.
What Are the Advantages of Recycling Polyethylene?
Conservation of Raw Materials
Recycling PE reduces the need for virgin polymer and helps conserve fossil-based raw materials used in conventional polyethylene production. Reusing recovered material also helps retain the value of resources already invested in the original product.
Reduction of Waste
Mechanical recycling diverts suitable polyethylene waste into new material applications instead of sending it directly to disposal or energy recovery.
The environmental benefit depends on the waste stream, the recycling process, the quality of the recovered material and the product it replaces.
Support for a Circular Economy
Recycled polyethylene can be returned to the manufacturing process and used to produce new goods. This helps establish material cycles in which plastic resources remain in use for longer.
Potential Environmental Benefits
Using recyclate may reduce the environmental impact associated with producing virgin polyethylene. The actual benefits depend on factors such as collection, sorting, transport, processing energy, material quality and the extent to which the recycled material replaces virgin material.
Recycling is therefore an important resource-efficiency measure, although it does not eliminate all environmental impacts associated with plastic products.
What Is the Difference Between PCR and PIR Recyclate?
Recycled polyethylene is commonly classified according to where the material originates. Two important categories are post-consumer recyclate (PCR) and post-industrial recyclate (PIR).
Post-Consumer Recyclate (PCR)
Post-consumer recyclate is obtained from plastic products that have reached the end of their intended use. The material may originate from household packaging, commercial waste or other collection systems.
The recycling process generally involves collection, sorting, cleaning, shredding, melting and granulation. Depending on the source material, additional treatment may be required to remove contaminants and achieve the necessary quality.
PCR can be used to manufacture a wide range of products, including refuse bags, construction films, protective packaging and other applications for which the material meets the required specifications.
The quality of PCR can vary considerably because the material may have been exposed to different environmental conditions and may contain mixed grades, colours or contaminants.
Post-Industrial Recyclate (PIR)
Post-industrial recyclate originates from manufacturing and processing waste generated before a product reaches the consumer. Examples include suitable production offcuts, edge trims, rejected film and other recoverable PE production residues.
Because this material is often collected directly from controlled manufacturing processes, it may be cleaner and more homogeneous than mixed post-consumer waste. Its quality nevertheless depends on the source, handling, segregation and previous processing history.
PIR can often be reintroduced into production with less extensive cleaning than some post-consumer materials. It can be especially valuable when the composition and properties of the original material are known.
Both PCR and PIR can contribute to resource efficiency. The appropriate type depends on the required product performance, the available material quality and any regulatory or customer-specific requirements.
Can Recycled Polyethylene Be Mixed with Virgin PE?
Yes. Recycled polyethylene can be blended with virgin polyethylene to achieve a balance between recycled content, material performance and production requirements.
The appropriate blend ratio depends on the quality of the recyclate, the virgin polymer grade, the intended application and the mechanical properties required in the finished product.
Depending on these factors, formulations may contain a range of recycled content, from relatively low proportions to very high proportions or, in suitable applications, 100% recyclate.
Higher recycled content can support resource efficiency, but it may also require adjustments to processing conditions, material selection or product design. The final blend must meet the relevant requirements for strength, flexibility, appearance, dimensional stability and durability.
For this reason, recycled content should be selected according to the application rather than treated as a universal percentage suitable for every PE product.
Our In-House PE Recycling Process
Our in-house reclaim plant enables us to recover suitable polyethylene production waste and return it to the manufacturing process.
More than 95% of our production waste is processed into recyclate through our in-house recycling operation. This helps us recover valuable material from our own production processes and reduce the amount of suitable production waste that needs to leave the manufacturing cycle.
The resulting recyclate can be blended with virgin polyethylene, depending on the application and the required material properties. Depending on the product specification, recycled content can range from 20% to 100% where technically suitable.
Our recyclate is primarily used in the production of refuse bags, protective and packaging films, and construction films. These applications can make use of recovered PE while meeting the relevant requirements for the finished product.
Because production waste is often generated under controlled conditions, it can offer advantages in terms of material consistency and traceability compared with some mixed post-consumer waste streams. The suitability of the recovered material is nevertheless assessed in relation to its intended use.
By recovering and reusing our own production residues, we aim to improve material efficiency, reduce waste and support the continued use of polyethylene as a valuable secondary raw material.
What Are the Challenges of PE Recycling?
Although polyethylene is suitable for mechanical recycling, several factors can affect the quality and usability of the recovered material.
Contamination
Food residues, dirt, adhesives, labels and other polymers can reduce recyclate quality. Effective sorting and cleaning are therefore important for producing material suitable for demanding applications.
Mixed Polymer Types
Polyethylene and polypropylene are different polymers and do not always form compatible blends. If they are mixed unintentionally, the resulting material may exhibit reduced mechanical performance or inconsistent processing behaviour.
Additives, Colours and Multilayer Structures
Pigments, fillers, stabilizers and other additives can influence the properties and appearance of recycled PE. Multilayer films containing different polymers can also be more difficult to recycle into high-quality material streams than suitable mono-material films.
Changes in Mechanical Properties
Heat and mechanical shear during processing can damage polymer chains. Recycled PE may consequently differ from virgin material in strength, flexibility, impact resistance and melt flow behaviour.
These challenges can often be managed through suitable collection, sorting, material selection and processing controls. However, the quality and suitability of recyclate must be evaluated for each intended application.
Is Recycled Polyethylene Suitable for Food Packaging?
Not automatically. Although polyethylene is widely used in food packaging, recycled PE must meet the applicable legal requirements for the intended food-contact application.
Post-consumer plastic can contain contaminants from previous uses or from other materials in the waste stream. For this reason, recycled plastics intended for food contact are subject to specific regulatory requirements and appropriate assessment of the recycling process and resulting material.
The suitability of a recycled material for food contact must therefore be established through the applicable legal framework and supporting documentation. The fact that virgin PE is commonly used for food packaging does not automatically mean that every recycled PE grade is suitable for the same purpose.
Is Polyethylene Recycling Environmentally Beneficial?
Mechanical recycling can help conserve raw materials and reduce the demand for virgin polyethylene. It can also reduce the quantity of suitable plastic waste requiring other forms of treatment.
However, the environmental benefit depends on the entire recycling chain, including collection, sorting, transport, washing, processing energy, material losses and the quality of the recycled product.
In general, high-quality material recycling is an important option for retaining the value of polyethylene. Energy recovery is a different waste-management route: it recovers energy from waste but does not return the plastic material to the manufacturing cycle.
Recycling, material efficiency and appropriate product design therefore work best together. Selecting recyclable PE constructions, reducing unnecessary material use and incorporating suitable recyclate can all contribute to a more resource-efficient packaging solution.
Conclusion: Polyethylene Is Recyclable
Polyethylene is a widely recyclable thermoplastic that can be mechanically processed into granules and used to manufacture new products. The quality of the resulting recyclate depends on the original material, sorting and cleaning, and the conditions used during processing.
Both PCR and PIR can provide valuable secondary raw materials. Depending on the intended application, recycled PE can be used on its own or blended with virgin material to achieve the required properties.
Through our in-house reclaim plant, we process more than 95% of our production waste into recyclate and reuse the recovered material in suitable products. This supports more efficient use of raw materials and helps keep polyethylene in circulation.
For each application, the appropriate recycled content should be determined by balancing material performance, product requirements and the desired level of resource efficiency.
