Design for Disassembly

A product made entirely from recyclable materials can be unrecyclable in practice. Recyclability is a property of construction rather than of composition, and the decisive detail is how parts are held together.

The joint is where it is decided

Every joining method sits somewhere on a spectrum from trivially reversible to permanently destructive, and the position determines whether separation is economic.

The bottom three are used because they are fast, cheap and produce a good result in manufacture. That is a genuine trade-off rather than negligence, and pretending otherwise makes the conversation with design engineers unproductive.

Disassembly time is the economic variable

Recyclers work to a cost per unit that the recovered material must cover. That budget is small, and it is spent in seconds rather than minutes.

This is why the number of distinct operations matters more than their individual difficulty. A product needing eight different tools and twelve steps is uneconomic even if every step is easy, while one needing a single tool and three steps may be viable.

What makes a product genuinely separable

A short set of principles covers most of the achievable improvement, and they are far less disruptive than they sound.

• Reduce fastener variety — one driver type across a product removes tool changes, which dominate disassembly time.
• Make high-value parts accessible first — batteries, boards and motors should not sit behind everything else.
• Avoid joining dissimilar materials permanently — metal inserts in plastic are the archetype.
• Design a deliberate separation sequence — and record it, so nobody has to discover it.
• Prefer mono-material assemblies where a joint would otherwise be permanent.

The first is the cheapest improvement available to most products and the most frequently ignored, because fastener selection is usually delegated to individual engineers rather than governed at product level.

Repairability and recyclability share a root

The design decisions that make a product recyclable are largely the same ones that make it repairable, which is convenient because the two goals are frequently pursued by different teams with different sponsors.

Presenting the case this way is more effective internally than arguing for recyclability alone, because repair has a nearer-term commercial consequence — warranty cost, service margin and reparability scoring — while recycling benefits accrue years later to somebody else.

What the passport should carry

Disassembly information is only useful if it reaches the person holding the product, which is what the passport is for.

The useful content is a separation sequence rather than an exploded diagram: which components to remove in what order, using which tools, to reach the parts worth recovering. Recyclers do not need to understand the whole product, only the path to the parts that pay.

Recording joining methods per interface also lets a recycler decide before handling the product whether it is worth processing at all, which is a triage decision currently made by guesswork.

Where the regulation is heading

Ease of disassembly is among the parameters Regulation (EU) 2024/1781 empowers the Commission to set requirements on, and it is already reflected in reparability scoring for several product groups.

The practical reading is that disassembly moves from a voluntary design virtue to a declared and potentially scored attribute. A manufacturer that has never measured its own disassembly time will be asked to declare it, and measuring it is a morning’s work that most have never done.

That measurement is worth doing early even where no requirement applies yet, because it is the only way to know whether a design change helped. Disassembly time is unusual among sustainability metrics in being directly observable: a person with a stopwatch and a set of tools produces a defensible figure in an afternoon.

It also produces the internal argument that other evidence cannot. Watching an engineer spend four minutes reaching a battery they designed the enclosure around changes design behaviour more reliably than any circularity briefing, and it costs nothing beyond the time to run it.