Ways out of downcycling: How do we achieve a true circular economy?

July 9, 2026

The idea of a functioning circular economy for plastics is as simple as it is ambitious: materials should ideally not become waste after use – as is still largely the case today – but remain in the system as raw materials. In practice, however, it took several decades before the first collection and processing systems for waste were established. But even these are still heavily influenced by so-called downcycling.

This means that while plastics are recycled, they lose important properties over their lifespan. High-quality packaging is thus transformed into products with lower requirements, for example in the construction or gardening sectors. While this process is technically sound and better than incineration, there are clear limitations: with each cycle, the material quality deteriorates to such an extent that, in most cases, only energy recovery remains as an option. It is therefore not truly a closed system, but rather an improvement on the existing linear economy.

Technical limits of mechanical recycling

The main reason for this is technical shortcomings. Mechanical recycling, i.e., the material recovery of plastic waste, has long been the industry standard, but it reaches its limits, especially with mixed, contaminated, or complex plastic waste. The quality of the plastic granules produced from the recycling process depends heavily on the purity of the starting material – and this is precisely what is often lacking in practice.

Achieving higher quality requires extremely complex and correspondingly expensive collection systems, which in practice are also likely to result in high reject rates. Since this is hardly economically feasible, current recycling processes generally lead to materials that are no longer suitable for high-quality applications. Downcycling is thus becoming a systemic effect – and not an exception.

How can quality loss in the plastics recycling loop be avoided?

A common practice for quality assurance in plastics recycling is so-called virgin blending, in which recyclates are deliberately blended with virgin material. The rationale behind this is that recycled plastics often exhibit reduced and more variable material properties due to thermal, mechanical, and oxidative stress, while virgin material is designed for specific applications. Blending allows mechanical properties, processability, and product specifications to be tailored to specific industrial requirements.

Virgin blending enables the use of recycled materials in more demanding applications by balancing out variations in properties and meeting minimum requirements. Since many recycled materials alone do not meet the required performance profiles, this approach is widespread. However, it does not represent a true solution to the quality loss, but merely compensates for it – the achievable material quality remains dependent on the proportion and quality of the recycled material.

Chemical recycling as the key to high-quality recyclates

At the same time, processes like virgin blending reflect the current reality: the cycle is not yet closed, as new fossil raw materials are still needed. The real transformation only begins with the transition to chemical recycling or to mixed chemical-mechanical processes. For example, in pyrolysis, plastic waste is broken down into its molecular components in order to obtain new raw materials.

Ideally, this process produces materials of comparable quality to virgin goods. For the first time, this makes tangible an approach that not only allows materials to remain in the cycle but also preserves their value. The direction is clear: with each technological advancement, the need to rely on new raw materials decreases, and we move closer to the goal of closed-loop material cycles.

Mass balance approach: A bridge between recycling and industry

Closely linked to modern recycling processes is the mass balance approach. It allows recycled raw materials – for example, from chemical processes – to be allocated to specific end products in terms of their environmental impact, even if they are mixed with fossil raw materials during the production process. This is particularly important in light of increasingly stringent legal requirements.

The mass balance approach thus creates the crucial link between new recycling technologies and existing industrial infrastructures. It makes circular raw materials scalable and marketable – a key step on the path from innovation to widespread application – and is therefore an integral part of enespa's approach. services offered.

The future of the plastics industry: Circular raw materials on an industrial scale

The circular economy for plastics is currently at a crucial turning point. The technologies are available, regulatory frameworks are evolving, and the demand for circular raw materials is growing steadily. What was long considered a vision is beginning to become reality – especially where innovative technologies meet industrial implementation.

For enespa, this vision has been guiding principles from the very beginning: a world without plastic waste. Over many years, the technological foundation for this has been laid – with a clear focus on solutions that prove themselves not only in the laboratory, but also on an industrial scale. Today, we stand on the threshold of the next phase: industrial scaling. The transition from technology to application has begun – and with it, the concrete prospect of permanently closing plastic loops.