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
The University of Tennessee, Knoxville is a comprehensive public land‑grant research university—the flagship of the UT System—classified as R1 and serving more than 40,000 students. Industry engagement is anchored by the UT Research Park at Cherokee Farm, where corporate R&D and joint university–national lab facilities sit just across the river from campus, including assets such as the Volkswagen Innovation Hub and an AT&T 5G testbed. UT’s long‑standing partnership with Oak Ridge National Laboratory—via UT‑Battelle and the UT–Oak Ridge Innovation Institute—gives companies streamlined access to national lab capabilities, talent, and joint programs. A statewide Extension network and established co‑op programs connect companies to faculty expertise and student talent across Tennessee and into federal labs. Research is supported by competitive federal sponsors such as the National Science Foundation and the U.S. Department of Energy. Commercialization is managed by the University of Tennessee Research Foundation, which handles IP, licensing, and startup formation.
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