Manufacture, repair, maintenance and disposal.

The six Rs of sustainability

Sustainability is the management of resources to minimise depletion, pollution, and environmental damage across a product’s life cycle.

The six Rs provide a framework for sustainable design:

Reduce

Reuse

Repair

Recycle

Rethink

Refuse

Key strategies:

Reducing material volume and eliminating unnecessary packaging

Using concentrated products and refill systems

Using CAD optimisation to reduce wall thickness and packaging volume

Improving transport efficiency through higher packing density

Designing lightweight structures (e.g. honeycomb cores) that maintain strength

Using laminated timber sections to reduce waste during processing

Reducing also lowers embodied energy and transport emissions across the supply chain.

Key approaches:

Designing durable products intended for multiple use cycles

Encouraging return, refurbishment, or redistribution systems

Reconditioning components (e.g. engines) to restore functionality

Supporting reuse through sharing platforms and charitable redistribution

Upcycling

Upcycling is the creative reuse of waste materials to produce products of higher value or function than the original item.

It differs from reuse by adding value, rather than simply extending life.

Rethink

Rethinking improves sustainability by challenging traditional choices and considering alternative:

materials

manufacturing methods

ownership models

energy sources

user behaviour

This often results in system-level changes rather than product-level ones.

Key points:

Recycling effectiveness depends on material purity

Metals (e.g. aluminium) recycle efficiently; composites are difficult to recycle

Polymer contamination can destroy entire recycled batches

Recycling is supported by legislation such as ELV and WEEE

Vehicles are complex to recycle due to depollution, ASR, and lithium batteries

‘Cradle to grave’ considers the full life cycle from extraction to disposal

‘Cradle to cradle’ ensures materials re-enter production in pure form

Refuse

Refuse involves avoiding products that cause unnecessary environmental harm.

This relies on:

Clear labelling and transparent marketing

Consumer awareness of efficiency, repairability, and recyclability

Rejecting products with excessive packaging, poor energy efficiency, or planned obsolescence

Key considerations:

Whether maintenance is intended for users or specialists

The need for seals, protection, and safety systems

Use of specialist tools or diagnostic equipment

The impact of adhesives and sealed construction on accessibility

Designing for maintenance increases longevity but may conflict with compact aesthetics and water resistance.

Temporary and integral fixings

Temporary fixings (e.g. screws) allow access for repair and servicing

Integral, tool-free fixings support routine maintenance such as battery replacement

Standardised components:

Improve interchangeability and availability

Reduce downtime and repair cost

Are often independently accredited (e.g. BSI)

Include fasteners, fuses, cartridges, and fittings

Allowing for service and repair

Adhesives and plastic welding often prevent repair

Circuit boards are usually replaced rather than repaired

Modular products (e.g. Fairphone) improve repairability

Composite materials are difficult to repair and recycle

Community repair initiatives promote sustainable behaviour

Ability to upgrade with software

Firmware updates can improve performance and extend product life

Software updates may also cause planned obsolescence if hardware becomes incompatible