TY CONF TI COMPARATIVE ANALYSIS OF PHYSICAL AND MECHANICAL PROPERTIES OF COMPOSITE MATERIALS BASED ON AGRO-INDUSTRIAL WASTE KW agro-industrial waste KW plant filler KW three-layer composite material KW sunflower husk KW buckwheat husk KW straw JO TECHNOLOGIES IN BIOECONOMICS: INNOVATIONS AND CHALLENGES IN THE 21ST CENTURY AU Fahrutdinov, R.R. AU Zakharova, E.A. AU Safin, R.G. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov