Wood free papers are the largest printing and writing papers category in terms of capacity. This category of papers comprises almost all office papers and offset grades used for general commercial printing. The definition of "office papers" encompasses forms, envelopes, technical papers, stationary and they are essentially uncoated wood free papers. Uncoated papers mainly contain wood fibers obtained by a chemical pulping process. The end use of wood free uncoated papers are either roll or sheet-fed offset printing, or as printer or copier papers.