Flexible Hollow‐Structured Reinforced Mycelium Insulation Material and its Performance

Abstract Faced with the environmental impact and non‐renewability of traditional petroleum‐based insulation materials like foamed polyethylene and asbestos, this study explores sustainable, bio‐based alternatives with improved thermal and mechanical performance. Using Ganoderma applanatum, a mycelial growth skeleton with an enhanced static air layer is constructed to optimize the material's insulation and strength properties. The resulting mycelium‐based composites (MBC) achieve a density of 195–249 kg m−3, a low thermal conductivity of 0.0370 W m−1∙K−1, a maximum flexural strength of 0.382 MPa, and a compressive strength of 2.409 MPa. Additionally, the material exhibits a high water contact angle of 138.6° and a water absorption rate of 44.05%–84.84%. Compared to previous studies, the composites demonstrate superior performance, striking a balance between thermal insulation and mechanical strength. These results highlight the potential of mycelium‐based materials as eco‐friendly alternatives in packaging, construction, and insulation, offering a viable solution to replace non‐renewable insulation products.