Scientists from Tufts University, Imperial College London, and the University of Michigan have developed a new method to transform silkworm silk into a remarkably strong, transparent material. Unlike traditional processing that dissolves silk with chemicals, this technique preserves the fibers by aligning them and applying precise heat and pressure. When heated between 257 and 419 degrees Fahrenheit and pressed at around 9,800 atmospheres, the silk fibers fuse into a dense solid.

The resulting material approaches the toughness of Kevlar, the synthetic fiber used in bulletproof vests, and can withstand ballistic impacts. But unlike Kevlar, it’s biocompatible—meaning it can safely integrate with the human body. This opens potential uses in medical devices such as bone screws, pins, and plates for fractures.

Published in Nature Sustainability, the study highlights a sustainable path forward for high-performance materials. Silk is renewable and biodegradable, making it an attractive alternative to petroleum-based synthetics. While not yet stronger than Kevlar, the material’s dual functionality—protective and medically safe—suggests future applications in both defense and healthcare.