Bio-based phase-change materials

Bio-based phase-change materials (PCM) absorb and release thermal energy as they transition between solid and liquid states at a defined melting temperature, providing passive thermal regulation for buildings, textiles, and thermal-storage systems. Conventional PCM chemistry is typically paraffin- or petroleum-derived; bio-based PCM substitutes plant-derived fatty acids or vegetable-oil derivatives for the same thermal-storage function, targeting USDA BioPreferred certification and appealing to buyers seeking to avoid fossil-derived thermoregulation chemistry. The confirmed vendor base spans three genuinely distinct applications — thermal energy storage, textile-integrated thermoregulation, and building-material PCM — with each of the three confirmed vendors occupying a different niche within the category.

The key directions of bio-based phase-change materials are:

1. Plant-derived PCM formulations: PCM chemistry derived from plant fatty acids or vegetable oils rather than paraffin, targeting the same melting-point thermal-storage function.
2. Textile-integrated thermoregulation: PCM formulated for incorporation into textile fibers or coatings, providing passive body-temperature regulation in apparel.
3. Thermal energy storage systems: PCM deployed in building or industrial thermal-storage applications, absorbing excess heat and releasing it when needed.
4. Microplastic-free formulation: an emerging differentiator — PCM chemistry engineered to avoid the microplastic-shedding concerns associated with some encapsulated PCM formats.

Sectoral value chain#

[Feedstock sourcing] ──> [PCM formulation] ──> [Melting-point tuning] ──> [Application integration]
                                                          │
                                                (textile/building/storage format)
                                                          │
                                                          ▼
[Thermal regulation in use] <─── [Product manufacturing] <┘

Value chain levels#

Cross-cutting technologies of the sector:

• Fatty-acid/vegetable-oil PCM chemistry: the core bio-based formulation science replacing paraffin as the phase-change substance.
• Melting-point engineering: tuning the specific blend to hit a target transition temperature for a given application (body temperature for textiles, building comfort range for construction).
• Microplastic-free encapsulation: formulation approaches avoiding the plastic microcapsule shells used in some conventional PCM formats.

The category’s technology spans three distinct application niches — building/industrial thermal storage, textile thermoregulation, and general bio-based PCM formulation — each with its own melting-point engineering requirements.

1. Broad-temperature-range bio-PCM formulation:
   • PureTemp’s -37°C to 151°C product range reflects formulation chemistry engineered across a wide span of transition temperatures for different application needs, from cold-chain to industrial process applications.
2. Building/industrial thermal storage integration:
   • Climator applies bio-based PCM chemistry to thermal energy storage systems, absorbing excess heat during peak periods and releasing it when needed, a passive-efficiency application distinct from textile use.
3. Microplastic-free textile thermoregulation:
   • RUDOLF’s RUCO-THERM PCM BIO-MFT explicitly targets microplastic-free formulation, addressing a specific environmental concern associated with some conventional encapsulated PCM textile treatments.