Keratin-based barrier coatings for sustainable fiber-based packaging

Overview

This research proposes a sustainable alternative to conventional polymer coatings used in fiber-based food packaging. The technology leverages keratin proteins—a biodegradable, naturally abundant material derived from wool, hair, hooves, and nails—to create barrier coatings that maintain the recyclability and compostability of paper substrates. By replacing petroleum-based barrier layers with a protein-based coating, this approach addresses growing consumer and regulatory demand for environmentally responsible packaging solutions without sacrificing functional performance.

Technical specifications

Key features:

• Keratin proteins extracted from low-cost waste streams (wool, hair, hooves, nails) and processed into powder form
• Film formulation combines keratin powder with water, a cross-linker, and a plasticizer to achieve desired barrier and mechanical properties
• Coatings are designed to be cast directly onto paper substrates, enabling integration with existing fiber-based packaging manufacturing
• The resulting coating is fully biodegradable and does not impede fiber recyclability
• Barrier properties are being optimized and benchmarked against commercially available fiber-based food packaging materials

Technology readiness level

This technology is at an early-stage research and development phase. While keratin films have been demonstrated in published literature for food packaging applications, casting these films onto paper substrates represents a novel extension of prior work. The proposed validation plan includes preparing keratin powder, screening cross-linkers and plasticizers, optimizing film casting onto paper, benchmarking barrier and strength properties against commercial alternatives, evaluating long-term stability under ambient conditions, and assessing biodegradability in compost environments. The research team is open to collaboration with industry partners to advance development toward commercial readiness.