wood natural organic material consisting of cellulose fibers embedded in matrix of lignin. regarding mechanical properties, fibers strong in tension, , lignin matrix resists compression. wood has been important construction material since humans began building shelters , using boats. wood used construction work commonly known lumber or timber. in construction, wood not structural material, used form mould concrete.
wood-based materials extensively used packaging (e.g. cardboard) , paper both created refined pulp. chemical pulping processes use combination of high temperature , alkaline (kraft) or acidic (sulfite) chemicals break chemical bonds of lignin before burning out.
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