Short answer: there is no single best replacement for EPS foam inserts. Molded fibre is the most mature and widely recyclable option, mycelium suits thick protective shapes, and seaweed foam such as SargasFoam targets premium inserts that need a smooth, foam-like finish from a waste-stream raw material. The right choice depends on product weight, finish, volumes and how the pack will be collected and recycled under the EU PPWR.
Side-by-side comparison
| Criterion | EPS foam | Molded fibre / pulp | Mycelium foam | Seaweed foam (SargasFoam) |
|---|---|---|---|---|
| Raw material | Fossil-based polystyrene | Recycled paper, bagasse, bamboo or wood fibre | Agricultural residues bound by fungal mycelium | Sargassum seaweed biomass — a coastal waste stream |
| Typical density | About 15–40 kg/m³ for protective grades | Varies with fibre and wall thickness | Generally denser than EPS | ≈ 70 kg/m³ for the current high-density pilot grade; lighter grades being characterised |
| Look and feel | Smooth, bright white | Fibrous, matt; finish improves with thermoformed ("smooth") pulp | Natural, textured | Light, smooth foam-like surface aimed at premium unboxing |
| Custom shapes | Molded to any geometry | Molded with tooling; thin walls, draft angles needed | Grown in molds; best for thicker parts | Molded or CNC-cut inserts with product-shaped cavities |
| Moisture | Not affected | Sensitive to moisture unless treated | Can be sensitive; often coated | Hydrophilic — use inside closed secondary packaging; coating in development |
| End of life | Recyclable in dedicated EPS streams; collection varies by country | Widely recyclable with paper; often home or industrially compostable | Often marketed as home-compostable | Expected to be industrially compostable; EN 13432 certification in progress |
| Maturity | Mature, global supply | Mature, large suppliers | Commercial, growing | Pilot scale (Lithuania); pilots validated on the customer's product |
Figures for EPS, molded fibre and mycelium are typical ranges and vary by supplier and grade. SargasFoam values are internal pilot measurements; accredited test data is being arranged. Always test the complete package on your own product.
What the EU PPWR means for the choice
The Packaging and Packaging Waste Regulation has applied since 12 August 2026. From 2030, packaging must meet design-for-recycling criteria (grades A–C), and from 2035 it must also be recycled at scale. Detailed criteria per packaging category are still being finalised in delegated acts. In practice this favours materials that fit an established collection and recycling route — which is a strength of molded fibre — and puts pressure on formats that are rarely recycled. Bio-based content alone does not make packaging compliant; compostability is required only for specific packaging types.
When each option fits best
- EPS — lowest cost and proven protection, but rising regulatory and brand pressure.
- Molded fibre — high volumes, paper-stream recyclability, products that accept a fibrous look.
- Mycelium — thicker protective blocks and corner pieces where a natural texture is wanted.
- Seaweed foam — premium beauty, fragrance and gift inserts that need a smooth foam-like finish and a distinctive origin story; currently for pilots and early adopters.
How to decide
- Define weight, fragility and geometry of the product, and the required unboxing finish.
- Map how the pack will be collected and recycled in your main markets.
- Order samples of two or three materials and run drop, vibration and compression tests on the complete package.
- Compare total cost including tooling, freight volume and EPR fees, not only part price.
Frequently asked questions
What is the best alternative to EPS foam inserts?
It depends on the product. Molded fibre is the most mature and widely recyclable option; mycelium suits thicker protective shapes; seaweed foam such as SargasFoam targets premium inserts that need a smooth foam-like finish. Test the complete package on your own product before switching.
Is seaweed foam lighter than EPS?
Not today. Protective EPS is typically about 15–40 kg/m³, while SargasFoam's current high-density pilot grade measures about 70 kg/m³. Lighter grades are being characterised.
Is molded pulp better than mycelium for packaging?
Molded pulp is more mature, cheaper at volume and fits the paper recycling stream. Mycelium is often chosen for thicker protective parts and a natural look. The choice depends on geometry, finish and volume.
Does switching away from EPS make packaging PPWR compliant?
Not automatically. From 2030 packaging must meet design-for-recycling criteria and from 2035 be recycled at scale. Any alternative must be assessed against those criteria for the specific packaging unit.