What is the difference between wood preservatives and tung oil?

Tung oil is effective in preventing decay and water damage, and it is environmentally friendly. However, its drawbacks include being cumbersome to use, having a long drying time, and its lingering odor which is difficult to dissipate. Additionally, tung oil needs to be reapplied annually, which can be time-consuming and labor-intensive.
Wood preservatives, on the other hand, serve to prevent insects and decay. The most important advantage is that a single treatment can provide preservation for several decades.
When treating outdoor wood, using wood preservatives is preferable to applying tung oil. While tung oil may enhance the appearance of wood, it only forms a surface film and cannot penetrate into the wood, resulting in subpar long-term protection. Wood preservatives, however, can penetrate into the internal cells of the wood, providing comprehensive and long-lasting protection, thereby extending the wood's lifespan.
Currently, Nantong Bod Biochemical Co., Ltd. produces wood preservatives including environmentally friendly ACQ wood preservatives that do not contain heavy metals, as well as common CCA wood preservatives. They also offer specialized wood protectants tailored for insect and termite resistance.