Lignin-incorporated PIR foam with class A fire rating and high insulation
A novel lignin-incorporated polyisocyanurate (PIR) foam that achieves Class A fire rating and an insulation R-value of ≥7. By leveraging lignin's char-forming capability, this eco-friendly material enhances fire resistance without compromising insulation efficiency.
Overview
The University of Tennessee, Knoxville, introduces an innovative lignin-incorporated polyisocyanurate (PIR) foam designed to meet high standards of fire safety and thermal insulation. This material achieves a Class A fire rating and an insulation R-value of ≥7, offering a superior alternative to traditional PIR foam. By utilizing lignin, a plant-based biomacromolecule, the foam enhances fire resistance through lignin's high char-forming capacity, aromatic backbone, and non-toxic properties.
Technical specifications
Key features:
- Incorporation of lignin and chemically modified lignin as additives in PIR foam
- Achieves Class A fire rating by leveraging lignin's high char-forming capacity
- Maintains an insulation R-value of ≥7, ensuring effective thermal insulation
- Non-toxic, halogen-free composition improves environmental safety
- Potential for chemical modification by incorporating P, N, or Si elements to enhance flame retardancy
Technology readiness level
The technology is currently at TRL 3, with ongoing development and validation planned over four quarters. The project includes formulation and characterization phases to refine lignin incorporation and optimize fire retardant performance. Future efforts will focus on chemical modification and synergistic combinations to enhance efficacy further.
About University of Tennessee, Knoxville
UT offers a partnership model that reduces risk, accelerates time-to-value, and supports long-term growth strategies for industry—providing an attractive platform for companies seeking to formalize collaboration and establish a long-term presence in the East Tennessee region. By aligning institutional investment with regional and national priorities, UT provides a stable and effective platform for industry collaboration, technology deployment, and sustained economic impact.
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