InventWood’s Superwood product starts with regular timber, which is mostly composed of two compounds, cellulose and lignin. The goal is to strengthen the cellulose already present in the wood. “The cellulose nanocrystal is actually stronger than a carbon fiber,” Lau said.
The company treats it with “food industry” chemicals to modify the molecular structure of the wood, he said, and then compresses the result to increase the hydrogen bonds between cellulose molecules.
"We might densify the material by 4x and you might think, ‘Oh, it’ll be four times strong, because it has four times the fiber.’ But it’s actually more like 10 times stronger because of all these extra bonds that get created,” Lau said.
The result is a material that has 50% more tensile strength than steel with a strength-to-weight ratio that’s 10 times better, the company said. It’s also Class A fire rated, or highly resistant to flame, and resistant to rot and pests. With some polymer impregnated, it can be stabilized for outdoor use like siding, decking, or roofing. InventWood’s first products will be facade materials for commercial and high-end residential buildings, Lau said.