What function do borates serve in wood preservation?

Borates are valued in wood preservation primarily because they serve as an insecticide and fungicide. This is due to their ability to inhibit the growth of fungi and protect against wood-destroying insects, including termites. By disrupting the reproductive processes and metabolic functions of these pests, borates offer a protective barrier that extends the lifespan of wood products.

In addition to their pest-controlling properties, borates are also non-toxic to humans and pets, which makes them an attractive option for treating wood in residential environments. This safety profile, combined with their effectiveness in preventing decay and pest infestation, reinforces their role as a crucial element in wood preservation strategies.

The other functions mentioned, such as acting as a water repellent, enhancing wood color, or providing structural support, do not accurately reflect the primary purpose of borates in the context of wood preservation.