A Study on a Flexural Strength of Malaysian Hardwood Timbers in Different Strength Groups Using Dynamic Mechanical Thermal Analysis (DMTA) Testing

Timber has been used for centuries as a construction material and is currently valued for its sustainability. In recent years, demand for high-strength timber species has grown, but they tend to be expensive and limited in supply. This situation encourages the use of lower-strength timber, especially in regions like Malaysia where such species are more accessible. However, before they can be reliably used, their performance—particularly under high-temperature conditions—needs to be better understood. This study focuses on the flexural strength of two Malaysian hardwoods, Keranji (SG3) and Keruing (SG5), by using Dynamic Mechanical Thermal Analysis (DMTA). Tests were conducted at 120°C and 160°C. At 120°C, both timbers maintained most of their original strength. However, at 160°C, Keranji showed a sharp decrease in strength, while Keruing became stronger. These findings suggest that Keruing may be more suitable for applications involving heat exposure, such as roof structures. The study offers new insights into how native Malaysian hardwoods behave in high-temperature environments, which is important for structural design and fire performance assessments.