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MGP stands for machine graded pine, and is a system used for particular pines, especially radiata, slash and Caribbean. Instead of being based on the bending strength of the piece, MGP is a measure of its modulus of elasticity (MOE), which takes into account other properties, such as stiffness, compressive strength and shear strength.
The higher the MOE of a piece, the stiffer it is. When this is measured by an MGP machine stress grader, the board is given a grade which is simply an abbreviation of the MOE category that it falls into.
That is:
MGP 10 has an MOE of 10,000 megapascals (MPa)
MGP 12 has an MOE of 12,700 Mpa
MGP 15 has an MOE of 15,200 Mpa
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