DOC KB-ECO-021REV 2026-09-21CLASS: PUBLIC
Recyclability of Protective Cases: PP, PE and Designing for End of Life
Direct answer
Polypropylene (recycling code 5) and polyethylene (code 4) are among the most widely recycled thermoplastics, and an all-PP case is straightforwardly recyclable where streams exist. The end-of-life challenge is the assembly: mixed materials — foam layers, elastomer gaskets, metal pins, labels — must be separated. Buyers can drive sustainability by specifying mono-material shells, water-based or minimal printing, take-back programs and stated recycled content levels.
§01What is in a case, and what happens to it
| Component | Material | End-of-life status |
|---|---|---|
| Shell | PP (#5) or PE (#4) | widely recyclable; easy identification via code |
| Foam | EPE/EVA/PU | EPE/PE foams recyclable in dedicated streams; PU rarely |
| Gasket / valve | EPDM/TPE/silicone | small mass; usually removed before recycling |
| Hinge pins, hardware | steel/stainless | metal recycling stream; mechanically removable |
| Graphics | inks, foils, labels | laser marking and embossing are the cleanest options |
§02Buyer levers that actually matter
- Mono-material shell + PP foam turns the whole body into one recyclable stream.
- Recycled content: post-industrial (factory regrind) is common and cheap; post-consumer resin needs stricter traceability — ask which one is quoted.
- Longevity is the first-order win: a case that serves ten years displaces ten single-use packaging cycles — durability is a sustainability specification, not a contradiction.
- Repairability: replaceable gaskets, latches and wheels keep a case in service; a spare-parts kit is a small purchase with a large end-of-life effect.
Question to ask any supplier: "What is the material breakdown of this case by weight, and where can each fraction go at end of life?" Manufacturers with real control of their bill of materials can answer in one page; it is a fast maturity test.