What mycelium composite materials are and how they are made

Mycelium composite materials (MBCs) are biodegradable biocomposites produced by inoculating organic, typically lignocellulosic substrates with fungal spores or mycelium. The growing hyphae digest and physically entangle with substrate particles — cementing them into a solid composite matrix without external adhesives or petrochemical binders. Once the growth cycle is complete, the material is heat-inactivated to halt biological activity and fix final properties.

Substrate materials span a wide range of agricultural waste streams: hemp shives, sawdust, straw, bamboo microfibers, bagasse, coffee grounds, and even seashells have been investigated. Among retrieved results, the dominant fungal genera are Ganoderma (particularly G. lucidum and G. australis), Pleurotus ostreatus (oyster mushroom), Trametes versicolor, Fomes fomentarius, and Lentinus edodes (Shiitake). A 2022 review identified over 70 fungal species studied for MBC production across the literature.

Fabrication follows one of several routes: mold-based cultivation under controlled temperature (20–30°C) and humidity (80–95% relative humidity) for 5–21 days is the most established approach. Additive manufacturing via extrudable mycelium pastes for robotic deposition is a rapidly emerging alternative. A distinct cluster focuses on growing dense hyphal networks in the near-absence of bulk substrate, producing leather-like or textile-like materials — the approach pursued commercially by Bolt Threads and MycoWorks.

A decade of patent activity: from foundational filings to commercial IP

Patent and literature publication dates in this dataset span from 2016 to late 2025, mapping approximately a decade of traceable innovation activity. The trajectory moves from baseline material characterisation in the 2016–2019 period, through a mid-stage diversification peak in 2020–2022, to growing application specificity and hybrid material architectures in 2023–2025.

The early foundational phase (2016–2019) established baseline material properties and fabrication parameters. Studies on substrate and fungal species selection showed that heat pressing improves homogeneity and stiffness. The MycoTree structural installation at the 2017 Seoul Biennale of Architecture and Urbanism demonstrated compression-only load-bearing geometries using bamboo and mycelium — an early proof-of-concept at architectural scale. Life cycle and substrate characterisation papers from 2019 established the physicochemical baseline for MBC performance, as confirmed by research published via WIPO-tracked PCT filings in the subsequent period.

The mid-stage development period (2020–2022) shows the highest clustering of retrieved results. Bolt Threads filed a core PCT application in May 2020 (with priority to May 2019) covering grown mycelium composite materials with favourable mechanical and aesthetic properties — subsequently prosecuted across US, WO, AU, CA, IN, and further US continuation filings. MycoWorks filed novel microstructure patents in 2021 claiming substantially increased hyphal density and tensile strength. Additive manufacturing integration emerged prominently, with extrusion-based 3D printing of living mycelium pastes documented in multiple 2021–2022 studies.

“Additive manufacturing integration is under-patented relative to its research momentum — only one retrieved patent directly claims a 3D-printed scaffold approach, representing an actionable IP opportunity.”

The most recent filings in this dataset (2023–2025) signal movement toward greater application specificity. Nanyang Technological University filed a 3D-printed wood-PLA scaffold approach in late 2025. Nike’s active US patent (2025) targets zonal-property footwear components. Vrije Universiteit Brussel introduced a thermoreversible gel-binder architecture in November 2025. The volume and diversity of 2025 filings — spanning Singapore, Belgium, Turkey, UAE, and Germany alongside continuing US prosecution — signals that mycelium composite IP is becoming genuinely international.

Where mycelium composites are competing: application domains and performance data

Construction and architecture represents the largest application domain by volume in this dataset, with mycelium composites investigated for insulation panels, acoustic tiles, structural blocks, modular interlocking systems, and load-bearing components. Thermal conductivity values of 0.0882–0.104 W/m·K have been reported for Miscanthus-mycelium composites, positioning them alongside expanded polystyrene (EPS) in insulation benchmarks — a comparison being formalised using European test standards for Fomes fomentarius-based composites.

Compressive strength of sawdust-based mycoblock reached 750 kPa at 21 days of moulding. OKOM WRKS LABS claims density greater than 0.25 g/cm³, Young’s modulus greater than 53 MPa, and ultimate compressive strength greater than 1.2 MPa for structural-grade composites using agricultural waste particulate reinforced with inner textile and exterior fascia. Research validated against standards tracked by ISO indicates that these performance benchmarks are achievable with consistent substrate and process control.

Packaging: the longest commercial track record

Packaging is the application domain with the longest commercial track record. A comparative life cycle assessment of hemp-mycelium inserts against EPS inserts — conducted per ISO 14040 — demonstrates favourable environmental performance for the mycelium alternative, providing gate-to-grave impact data that supports procurement decisions by companies committed to circular economy targets.

Fashion, textiles, and footwear: the highest IP concentration

Pure mycelium leather-like materials — Mylo by Bolt Threads and Fine Mycelium by MycoWorks — are the subject of the most heavily prosecuted patent families in this dataset. Nike’s biocomposite patent family (WO 2020, US 2025 active) applies zonal mycelium composites to footwear components where spatially differentiated mechanical performance zones within a single part are a critical differentiator. Khalifa University of Science and Technology’s 2025 US filing directly targets textile waste as a substrate, closing a circular loop within the fashion supply chain.

Furniture, interior design, and biomedical applications

Wood-veneer-reinforced mycelium composites and bamboo-mycelium biocycle materials are documented for furniture and interior components with 5–7 year service lives. The HOME research project demonstrated CO₂-neutral interior fittings for office spaces using timber veneer and mycelium. A smaller but distinct cluster explores mycelium-based porous matrices as supports for phase-change materials (PCMs) for thermoregulation, where mycelium hyphae have been shown to outperform microfibrillar cellulose for PCM adsorption due to higher bulk density.

Who owns the IP: key assignees and jurisdictional concentration

US jurisdiction dominates the retrieved patent records, with Bolt Threads, OKOM WRKS LABS, MycoWorks, Nike, Case Western Reserve University, Khalifa University, and RWTH Aachen all filing US applications. WO (PCT) filings enabling broad multi-jurisdictional coverage follow as the second most common route, reflecting the PCT prosecution strategy typical of technology-intensive startups.

The literature base, by contrast, is heavily European in authorship — Netherlands, Belgium, Germany, Portugal, Switzerland, and Norway feature prominently — suggesting a meaningful gap between European academic research leadership and US-dominated patent prosecution. This divergence is characteristic of a technology where academic groups develop and validate material science, but commercially motivated entities file broad early claims in the most commercially significant jurisdiction, as tracked by EPO filings data.

Bolt Threads’ 8-record portfolio spans US (multiple active), WO, CA, AU, and IN — achieved through a disciplined PCT continuation strategy from a single foundational priority date in May 2019. OKOM WRKS LABS’ 3 US records are notably specific, each targeting structural and load-bearing biocomposites with defined mechanical specifications. MycoWorks’ 3 records across WO (2021), CA (2021), and US (2023, pending) are anchored by claims on substantially increased hyphal density — a microstructural differentiator that directly challenges Bolt Threads’ territory for high-performance applications.

Five emerging directions from 2024–2025 patent filings

The most recent filings in this dataset cluster around five distinct directional signals, each addressing a specific limitation of earlier-generation mycelium composite approaches.

1. 3D-printed scaffold and mycelium hybridisation

Nanyang Technological University’s 2025 WO patent introduces 3D-printed wood-PLA porous scaffolds (50–90% porosity) as structural templates for mycelium colonisation. This approach — where mycelium grows on both inner and outer scaffold surfaces via a peptone-malt-agar nutrient coating — converges additive manufacturing and biotechnology, eliminating traditional mould waste while enabling complex geometries. It directly addresses the oxygen access limitations inherent in dense mould-based cultivation at scale.

2. Mycelium–algae co-cultivation for carbon-negative composites

A December 2025 WO filing by inventor ISIK, GÖKÇE AYDAN introduces co-cultivation of mycelium and algae as a route to carbon-negative composites targeting automotive, construction, interior design, and packaging verticals. This biological pairing was undocumented in the earlier dataset records, representing a genuinely novel organism-combination strategy within the field.

3. Textile waste as mycelium growth substrate

Khalifa University of Science and Technology’s December 2025 US filing explicitly addresses textile waste — cotton, polyester, and nylon blends — as mycelium growth substrate. This directly links the MBC technology to fashion industry waste streams in a circular economy model distinct from the agricultural waste approaches that dominate the earlier literature, and aligns with circular economy frameworks increasingly mandated by OECD member economies.

4. Thermoreversible binder architecture

Vrije Universiteit Brussel’s November 2025 WO and EP filings introduce thermoreversible gel as a binder within a layered mycelium composite architecture. The layered structure — comprising a mycelium layer, a thermoreversible gel binder layer, and a structural backing — may enable controlled disassembly, repair, or end-of-life recycling of MBC products, directly addressing the durability and moisture resistance challenges that recur across the literature as primary barriers to construction sector adoption.

5. Fashion and athletic footwear application specification

Nike’s active US patent (2025) applies a biopolymer material including mycelium grown from a fungal strain, combined with an internal zonal-property-imparting structure — targeting spatially differentiated mechanical performance zones within a single composite part. This level of application specificity, combined with Bolt Threads’ continued US prosecution, signals that commercial IP in the fashion and performance footwear vertical is hardening into a defined claim landscape that new entrants must map carefully.

Strategic implications for R&D teams and IP professionals

Five strategic priorities emerge from the IP and technology signals in this dataset, relevant to R&D teams, patent counsel, and strategic innovation leaders operating in or adjacent to the mycelium composite space.

• Freedom-to-operate analysis is mandatory for fashion and leather entrants. Bolt Threads (8+ patent records across 5 jurisdictions) and MycoWorks (3 records in WO, CA, US) have established early, broad positions in pure mycelium and high-density hyphal network materials. New entrants targeting mycelium leather or textile substitutes face significant freedom-to-operate challenges and should conduct thorough claim mapping against both families before committing R&D investment.
• Structural applications represent a significant white space. OKOM WRKS LABS holds the most specific structural biocomposite patents in this dataset, but the overall IP density around load-bearing mycelium composites is low relative to the research literature. R&D teams targeting construction structural elements (panels, beams, bricks) face fewer patent barriers but must address standardisation and durability data gaps consistent with standards tracked by ISO and EPO.
• Additive manufacturing integration is an actionable IP opportunity. Multiple academic groups have demonstrated extrudable mycelium pastes and robotic deposition, but only one retrieved patent directly claims a 3D-printed scaffold approach. Organisations with both bioprocess and additive manufacturing expertise have a window to establish IP positions in this convergence zone.
• Substrate diversity is a competitive differentiator. Over 15 distinct substrate materials are identified across the dataset. Organisations that can demonstrate reliable mechanical performance across non-agricultural waste streams — textile waste, seashells, urban organic waste — will differentiate on supply chain resilience and access emerging circular economy regulatory incentives.
• Durability and moisture resistance IP has outsized commercial value. Surface treatments, coatings, and thermoreversible binder approaches (as in Vrije Universiteit Brussel’s 2025 filings) address the primary technical barrier flagged across the literature as blocking construction sector adoption. Investing R&D and IP strategy here is likely to unlock the largest addressable commercial opportunity in the near term.

“Over 15 distinct substrate materials have been identified in the mycelium composite dataset — organisations demonstrating reliable performance across non-agricultural waste streams will differentiate on supply chain resilience.”