The best teak wood for furniture making is typically the wood from the species Tectona grandis. This species is known for its exceptional durability, natural oil content, and resistance to decay and insects, making it ideal for outdoor furniture and high-quality indoor pieces. The high oil content of Tectona grandis provides natural weatherproofing, which is crucial for furniture that will be exposed to the elements.

Data from the Forest Products Laboratory at the United States Department of Agriculture (USDA) supports the use of Tectona grandis for furniture making. A study published in the Journal of Wood Science in 2015 found that Tectona grandis has a higher resistance to decay than many other hardwoods, with a service life of over 25 years when exposed to outdoor conditions. This longevity is due to the wood's high density and natural oils, which protect it from moisture and pests. Additionally, the Janka hardness test, which measures the resistance of wood to indentation, shows that Tectona grandis has a Janka hardness of 2,670 lbf (pounds-force), ranking it among the hardest woods, which is beneficial for furniture that requires structural integrity and resistance to wear. The combination of these properties makes Tectona grandis the preferred choice for high-quality furniture manufacturing.