The thermal conductivity of the polymer is pretty close to the thermal conductivity of their window[0]. It looks like literally any fiber with an appropriately

The thermal conductivity of the polymer is pretty close to the thermal conductivity of their window[0]. It looks like literally any fiber with an appropriately balanced fiber size v. refractive index difference would do the same job. If you were going to support this between two panes of glass for waterproofing, you might as well just use the PVA and skip the wood, as it will likely be much cheaper eliminating the harvesting, rotary cutting, delignification, and impregnation steps. Or, you might even put nothing between the two panes of glass, since air is a good insulator as well. [0] https://pubs.acs.org/doi/pdf/10.1021/acs.macromol.5b02477 https://pubs.acs.org/doi/pdf/10.1021/acs.macromol.5b02477