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Medium-density fibreboard
Medium-density fibreboard (MDF) is an engineered wood product made by breaking down hardwood or softwood residuals into wood fibres, often in a defibrator, combining it with wax and a resin binder, and forming panels by applying high temperature and pressure.〔Spence, William P. (2005). ''The Home Carpenters & Woodworker's Repair Manual''. New York: Sterling. ISBN 1-4027-1055-0 p. 114〕 MDF is generally denser than plywood. It is made up of separated fibres, but can be used as a building material similar in application to plywood. It is stronger and much denser than particle board.
The name derives from the distinction in densities of fibreboard. Large-scale production of MDF began in the 1980s, in both North America and Europe.〔United Nations (2005). ''European forest sector outlook study: 1960/2000/2020, main report''. New York (): United Nations. p. 32. ISBN 9211169216.〕
==Physical properties==
Over time, the word "MDF" has become a generic name for any dry process fibre board. MDF density is typically between 500 kg/m3 (31 lbs/ft3) and 1000 kg/m3 (62 lbs/ft3). The range of density and classification as Light or Standard or High density board is a misnomer and confusing. The density of the board, when evaluated in relation to the density of the fibre that goes into making the panel, is important. A thick MDF panel at a density of 700-720 kg/m3 may be considered as high density in the case of softwood fibre panels, whereas a panel of the same density made of hard wood fibres is not regarded as so. The evolution of the various types of MDF has been driven by differing need for specific applications.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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