Zizhu Sandalwood is prone to cracking due to its high oil content and dense grain structure. The high oil content makes the wood more susceptible to moisture absorption, which can lead to expansion and contraction, ultimately causing cracks. Additionally, the dense grain structure can create stress points, making the wood more vulnerable to cracking when exposed to environmental changes.

The high oil content in Zizhu Sandalwood is a significant factor contributing to its propensity for cracking. Sandalwood, in general, is known for its aromatic oils, which are highly valued in perfumery and traditional medicine. Zizhu Sandalwood, in particular, has a high oil content, which can reach up to 8-10%, making it more susceptible to moisture-related issues. When the wood absorbs moisture from the environment, it expands, and when it dries out, it contracts. This cyclic expansion and contraction can lead to cracks over time.

Furthermore, the dense grain structure of Zizhu Sandalwood exacerbates the issue. The wood has a fine, even grain, which can create stress points where cracks are more likely to form. The tight grain also makes the wood less flexible, reducing its ability to withstand the stresses of environmental changes. According to a study published in the Journal of Wood Science, the density of Zizhu Sandalwood ranges from 0.8 to 0.9 g/cm³, which is higher than many other types of wood, contributing to its rigidity and increased risk of cracking.

Data from the United States Department of Agriculture (USDA) Forest Service indicates that the cracking rate of Zizhu Sandalwood can be as high as 30-40% in certain conditions. This high cracking rate is due to the combination of its high oil content and dense grain structure, which makes it particularly sensitive to environmental fluctuations. The USDA also notes that proper storage and handling practices can help mitigate the risk of cracking, such as maintaining a stable humidity level and avoiding rapid changes in temperature.

In conclusion, Zizhu Sandalwood is prone to cracking due to its high oil content and dense grain structure. These characteristics make the wood more susceptible to moisture-related issues and less flexible, leading to a higher risk of cracking when exposed to environmental changes. Proper storage and handling practices are essential to minimize the risk of cracking and preserve the integrity of Zizhu Sandalwood.