However, recycling chains today are often poorly aligned with the products they must process, while many products are not designed to fit seamlessly into their intended recycling pathways. As a result, collaboration between product designers and recycling‑chain stakeholders remains limited. This disconnect arises mainly because communication is weak and the time gap between product design and end‑of‑life treatment is significant.
To address these challenges, the design phase and the end‑of‑life phase must be closely connected. Designers must create products both for and from end‑of‑life processes, applying Design for Recycling to guide material choices, assembly methods, and product architecture. At the same time, recycling stakeholders must adapt their practices to support design‑driven circularity. Figure 1 illustrates potential interactions and approaches between designers and end‑of‑life actors.
Figure 1. Possible approaches and exchanges between designers and EoL stakeholders
Rethinking Materials Through Waste Streams
Developing new materials begins with analysing the waste generated in cities. For example, construction waste – glass, concrete, stone, bricks, cement, porcelain, ceramics – forms a major stream, alongside plastics, packaging, fishing nets, textiles, leather, cork, paper, and obsolete equipment. By applying Design for Recycling principles, these waste streams can be evaluated for their potential to become new resources.
After identifying streams, the next step will be to explore how they can be reused. Technologies that convert waste into new materials are rapidly advancing, and Design for Recycling plays a crucial role in ensuring that these materials can re‑enter production loops without generating additional waste.
Furthermore, using local waste materials reduces transportation impacts and supports regional circular economies. In this way, production and consumption loops can be effectively closed.
Figure 2. Easy-to-follow design principles (Source – www.giz.de)
Upstream and Downstream Waste Strategies
Waste management strategies fall into two categories:
- Upstream measures, such as Design for Recycling, which prevent waste by influencing design and manufacturing
- Downstream measures, which address waste handling and recycling
Because upstream measures shape the product before it becomes waste, they offer the greatest potential for circularity. Design for Recycling, in particular, integrates end‑of‑life considerations into early design decisions. A full understanding of recyclability includes material properties, collection systems, sorting technologies, and industrial recycling capabilities.
Ideally, designers should consider which waste stream a product will enter and whether it can be effectively recycled under current conditions.
Figure 3. Full circular ecosystem (by Ellen McArthur foundation – source www.polyce-project.eu)
Benefits of Design for Recycling
- Simplifies sorting and waste handling
- Produces high‑quality recycled materials
- Reduces landfill and environmental leakage
- Ensures a stable supply of secondary raw materials
In addition, Design for Reuse complements Design for Recycling by maximizing the value extracted from materials, energy, and human effort.
As a result, a broad understanding of recyclability also takes into account existing infrastructures. For instance, in Germany, packaging is recyclable if it meets criteria related to collection, sorting, industrial processing, and material compatibility. These criteria align closely with Design for Recycling principles.
Understanding Recyclability
Within the Design for Recycling framework, recyclability guides material and design choices.
From a narrow perspective, recyclability refers to whether an industrial‑scale process can convert scrap into usable output. From a broader perspective, it considers whether materials are actually recycled in practice.
This broader view includes:
- Separate collection systems
- Effective sorting based on material identification
- Easy disassembly of multi‑material components
Ultimately, high recyclability requires mono‑material streams and minimal impurities – core principles of Design for Recycling.
The Waste Hierarchy
To maximize environmental benefits, this is the waste hierarchy to follow:
- Reduction
- Reuse
- Material recycling (supported by Design for Recycling)
- Organic recycling
- Energy recovery
Generally, material recycling that preserves the highest material value is preferred, and Design for Recycling helps achieve this.
Figure 4. Waste hierarchy
Uniting Two Worlds
Thus, circular design involves two complementary approaches:
- Design for Recycling, which ensures products can be effectively recycled
- Design from Recycling, which uses recycled materials in new products
When considering the full lifecycle, two interconnected “worlds” emerge:
Product Development World
Designers, engineers, manufacturers, and consumers collaborate to create products that are both functional and visually appealing. Here, Design for Recycling ensures these products remain compatible with circular systems.
Material Recovery World
Municipalities, waste collectors, and recyclers extract value from discarded materials. Their work becomes more efficient when products follow Design for Recycling principles.
Circular Development Levels
Consequently, both design‑for and design‑from recycling operate at two levels:
- Product level: overall assembly, functionality, and aesthetics
- Part level: individual components, materials, and functions
Regardless of the level, production constraints must always be considered, including manufacturing techniques and their compatibility with Design for Recycling.
Design for Recycling
This approach focuses on product architecture and how the product will be collected, sorted, and processed at end‑of‑life. Components should be easy to separate, free of toxic substances, and designed to fit existing recycling streams. Once these requirements are defined, recycled plastics may be incorporated depending on sustainability goals, budget, and material availability.
Design from Recycling
This approach often involves redesigning specific parts to use recycled plastics. The “drop‑in method” replaces virgin materials with recycled alternatives in existing products, allowing companies to gain experience without major investments. Alternatively, entirely new products can be designed using recycled materials from the start.
In both cases, this approach complements Design for Recycling by demonstrating the value of circular materials.
