Pine Grade I, Shandong Province, has 12 (%) moisture content, 650 (g/m3) apparent density, 1000 (MPa) flexural strength, high heat preservation performance, special function, non-splitting linear expansion rate, 10000 usage, plywood specifications 2440*1220/3050*1220 (mm) structural plywood, which belongs to LVL and plywood used in wood-structured houses. Structural material. Structural plywood production process and quality requirements are particularly high, especially for high tolerance requirements, the Japanese control standard is (+0.2mm); glue use has two kinds, Japanese standard T1 is waterproof (phenolic glue), T2 is not waterproof (uroformaldehyde glue), but all require formaldehyde emission to reach F4 star; that is, formaldehyde emission is less than 0.3mg/cubic meter; at present, phenolic aldehyde is generally used in China. Glue. The material requirements of structural plywood are not very high. Grade B plywood can allow stuttering, holes, explosion cracks, etc. But the thickness of surface veneer is required to reach 1 mm, generally not less than 0.9 mm. The vertical veneer in the middle is made of long and medium plates, while the transverse veneer is spliced in advance, and the radiation pine material can be used. The plywood used in the structure has good weather resistance and aging resistance, as well as seismic and impact resistance. At the same time, it also puts forward higher requirements for mechanical properties such as static flexural strength and elastic modulus.