Capability analysis for modulus of elasticity and modulus of rupture

Sawn softwood timber is used as a structural component in house walls and roofs. Consequently, the consumption trends generally follow those of the housing industry. Therefore, Government imposes tough quality control and quality assurance on the timber industry to grantee product standard meets the specifications in building industry. Capability Analysis on the timber product plays an important role in assessing the capability of the timber in meeting the market functionality requirements. Two characteristics continuously monitored are the Modulus of Elasticity MOE and the Modulus of Rupture MOR. In this paper, we analyse the data collected from three different mills located in three different states based on both, the government recommended Specification Limits and the Natural Statistical Specification Limits. The analyses show that the government tough recommended Specification Limits results in many timbers to be downgraded.