Circular Economy in the Plastics Industry: How to Effectively Use Recyclates and Bio-Based Materials
Recycled and bio-based polymers offer a path to more sustainable production, but their processing requires specific additives and know-how. How can these materials be properly combined with primary raw materials to achieve comparable quality?
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The plastics industry faces increasing pressure to reduce its environmental footprint, with recycled and biobased polymers playing a key role. However, their use is not as simple as merely replacing primary raw materials. Recyclates often contain impurities, residual additives, or have different rheological properties, which can lead to processing issues or reduced mechanical properties in final products. Biobased materials, in turn, require specific processing conditions and stabilization. This article explores how to overcome these challenges through the proper selection of additives, modifiers, and technological adjustments to achieve quality comparable to traditional polymers.
Circular economy in the plastics industry: Why it is essential and what benefits it brings
The plastics industry faces increasing pressure to reduce its environmental impact, driven not only by legislation but also by customer and investor expectations. The circular economy represents a systemic approach that replaces the linear 'take-make-dispose' model with a closed loop, where materials are used for as long as possible, recycled, or composted. For plastics and rubber manufacturers, this means rethinking the entire product lifecycle—from raw material selection and design to end-of-life. A key advantage is reducing dependence on fossil resources, minimizing waste, and often cutting costs through more efficient material use.
In practice, the circular economy in the plastics industry manifests through the adoption of recycled polymers in production, optimization of manufacturing processes for easier recycling, or the development of bio-based materials from renewable sources. Certifications like REACH also play a crucial role in ensuring the safety and transparency of raw materials used. For manufacturing companies, the circular approach presents an opportunity for innovation—whether through new material blends, lighter product designs, or technologies for waste separation and processing. However, effective implementation requires collaboration across the entire supply chain, from raw material suppliers to waste processors.
Recyclates in Plastics: How to Select and Process Them Correctly
Using recycled plastics (recyclates) is one of the most effective ways to reduce the ecological footprint of production. Recyclates are obtained through mechanical or chemical recycling of plastic waste, with each method having its advantages and limitations. Mechanical recycling is less energy-intensive and suitable for clean, single-type waste, while chemical recycling enables the processing of contaminated or mixed plastics back to the level of original monomers. For manufacturers, it is crucial to select recyclates with properties that meet the requirements of the final product—such as mechanical strength, thermal resistance, or color stability.
When selecting recycled materials, several factors must be considered: the origin of the material (e.g., post-industrial vs. post-consumer waste), the degree of polymer degradation, and compatibility with other components in the blend. Standard testing methods are used to verify parameters such as melt flow index (MFI), impurity content, or the presence of undesirable additives. To achieve optimal results, recycled materials are often combined with virgin polymers or additives that enhance their processability and performance. It is also important to comply with legislative requirements, particularly REACH and CLP regulations, which set limits for hazardous substances in recycled materials. A properly selected recycled material can reduce raw material costs by up to 30% while also contributing to sustainability goals.
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Biobased Materials: Sustainable Alternatives to Traditional Polymers
Biobased materials, produced from renewable sources such as plant oils, starches, or cellulose, represent a promising alternative to fossil-based polymers. Unlike biodegradable plastics, which decompose in nature, biobased materials are defined by their origin—their carbon footprint is significantly lower because the CO2 released during their combustion was originally bound in plants. Among the most widespread biobased polymers are PLA (polylactic acid), PHA (polyhydroxyalkanoates), or bio-PE and bio-PET, which have properties comparable to conventional plastics but with a lower environmental impact.
The selection of a suitable biobased material depends on the application and required properties. For example, PLA is suitable for packaging or single-use products due to its biodegradability, while bio-PE is used in sectors where durability and resistance are important. The challenge remains the price, which is often higher for biobased materials than for fossil-based polymers, as well as the availability of raw materials in sufficient quantities. For manufacturers, it is therefore key to optimize production processes and seek synergies with recyclates—by combining biobased polymers with recycled fillers, both ecological and economic benefits can be achieved. It is also important to verify certifications such as "OK Biobased" or "USDA Certified Biobased Product," which confirm the proportion of renewable raw materials in the material.
Practical Steps for Implementing Circular Principles in Production
The transition to a circular economy requires a systematic approach and the involvement of all company departments—from product development through raw material procurement to logistics. The first step is to analyze existing processes and identify areas with the greatest potential for improvement. This may include, for example, redesigning products for easier disassembly and recycling, replacing problematic additives with safer alternatives, or optimizing energy and water consumption in production. It is also important to map available sources of recyclates and biobased materials and evaluate their compatibility with production technologies.
Another key step is collaboration with suppliers and customers to create closed loops. This may involve implementing a product take-back system at the end of their lifecycle, partnering with recycling companies, or jointly developing new material solutions. Successful implementation also requires employee training and the introduction of internal standards for tracking and reporting environmental indicators. Companies adopting a circular approach should start with pilot projects—such as replacing a portion of virgin polymers with recyclates in less demanding applications—and gradually expand successful practices across the entire production process. In the long term, the circular economy brings not only environmental but also economic benefits, such as reduced raw material costs, improved brand image, and access to new markets.
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Optimizing processes for recycled and bio-based materials
The introduction of recyclates and biobased polymers into the production process requires adjustments to technological parameters. A key factor is the processing temperature – recycled materials often exhibit different flow properties and viscosity compared to virgin polymers. For example, polyethylene (PE) from recyclate may require a melting temperature 5–10 °C lower to prevent material degradation. Conversely, with biobased polymers such as PLA (polylactic acid), it is essential to adhere precisely to the temperature profile, as processing at excessively high temperatures leads to hydrolysis and loss of mechanical properties.
Moisture also plays an important role. Both recyclates and biobased materials are often hygroscopic, meaning they absorb moisture from the surrounding environment. Therefore, it is crucial to dry the material to a moisture level below 0.05% before processing to avoid bubble formation, surface defects, or reduced product strength. Standard drying methods include hot-air dryers or desiccant dryers with molecular sieves, which ensure consistent quality of the input material.
Combining Recyclates and Additives to Improve the Properties of Final Products
Recycled polymers often suffer from reduced mechanical strength, thermal stability, or UV resistance. These deficiencies can be compensated for by the targeted use of additives. For example, the addition of 1–3% compatibilizers, such as maleic anhydride-modified polyolefins, improves the bond between recyclate and any fillers or virgin polymers. To enhance resistance to aging, antioxidants and UV stabilizers are used, extending the product's lifespan even with repeated use.
For biobased materials, addressing their brittleness and low thermal resistance is crucial. Plasticizers based on vegetable oils or epoxidized esters can improve flexibility, while nucleating agents accelerate crystallization and increase stiffness. It is also important to test the compatibility of additives with the specific type of polymer, as an incorrect combination can lead to additive migration to the surface or material degradation during processing.
Monitoring and Certification: How to Demonstrate Product Sustainability to Customers
For manufacturers, it is crucial not only to implement circular economy principles but also to communicate them transparently to customers. Certifications such as ISCC PLUS (for biobased and recycled materials) or EuCertPlast (for recyclates) provide independent verification of the origin and quality of raw materials. These certificates are often required in the automotive, packaging, or construction industries, where strict sustainability and material traceability requirements are imposed.
An important tool is also the product life cycle assessment (LCA – Life Cycle Assessment), which quantifies environmental impacts from raw material extraction to end-of-life. The results of an LCA analysis can serve as a basis for product ecodesign, energy consumption optimization, or raw material supplier selection. Additionally, customers benefit if the manufacturer provides specific data on the reduction of the carbon footprint or the proportion of recycled material in the product, which strengthens trust in sustainable solutions.
Need to Optimize Your Processes?
Every recycled or bio-based raw material requires an individual approach. GCG Group provides not only a wide range of additives for plastics and rubber but also technical support, including compatibility analysis and processing recommendations. For each raw material, we supply detailed technical and safety data sheets so you can transition to more sustainable production without compromising on quality. Contact us – or browse our catalog of over 1,300 products right away.
