MGR (Malaysian Grading Rules) is a set of timber grading rules specific to Malaysia and is used for sawn timber produced in Malaysia. The MGR grading system is based on visual grading, which means that the timber is visually inspected and graded according to its appearance, strength, and other characteristics. The MGR grading rules are used to classify the sawn timber into various grades based on the quality of the timber.
MGR grades are categorized into two main classes: structural grades and appearance grades. The structural grades are used for timber that is intended for use in construction, while the appearance grades are used for decorative purposes or in the production of furniture.
The structural grades are further divided into four classes: SG1, SG2, SG3, and SG4, with SG1 being the highest grade and SG4 being the lowest grade. The appearance grades are divided into three classes: AP1, AP2, and AP3, with AP1 being the highest grade and AP3 being the lowest grade.
In addition to the grades, MGR also specifies the moisture content, dimensions, and other properties of the sawn timber. The moisture content of the sawn timber is specified to ensure that the timber is suitable for its intended use and to prevent shrinkage or warping.
Overall, the MGR grading system helps ensure that the sawn timber produced in Malaysia meets specific quality standards and is suitable for its intended use.