▎ 摘　　要

NOVELTY - Composite material comprises a closed cell polyurethane matrix portion exhibiting at least some properties associated with wood, and a particulate portion homogeneously distributed and suspended in the matrix portion, where the particulate portion is chosen from fiberglass, hemp fiber, textile fibers, cotton fibers, textile strips, poly(azanediyl-1,4-phenyleneazanediylterephthaloyl) fiber, graphene, graphite, carbon nanotubes, alumina, silica, Portland cement, aluminum powder, steel powder, iron powder, iron filings, copper powder, tungsten carbide, boron nitride, diamond, amorphous carbon, and/or their combinations. The composite material has a compressive strength of 2000-10000 psi, a tensile strength of 800-10000 psi, a shear strength of 1000-8000 psi, and a density of 0.15-1.2 g/cc. USE - The composite material is used for forming a structural material. ADVANTAGE - The structural material has the advantageous properties of a wood-based structural material while lacking the disadvantageous properties of wood, thus allowing for the use of conventional construction techniques, but that also provides protection against damage caused by water, fire, insect, and microorganisms. The composite material achieves enhanced physical properties, such as compressive strength, tensile strength, and shear strength while remaining relatively light weight and often retaining the desirable property of being able to hold nails. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for forming a structural material comprising (a) providing the formulation contained in a mold having a pressure rating of at least 600 psi., (b) sealing the mold within 1-10 minutes after providing, and (cc) polymerizing the formulation in an exothermic and substantially adiabatic manner until complete as evidenced by no further generation of heat.