Zinc chloride solution for wood preservation

Wood is a sustainable material widely used in construction, furniture and other fields. However, due to the susceptibility of wood to fungi, insects and decay, wood preservation becomes critical. Among them, zinc chloride solution is widely used as a commonly used wood preservative.

Zinc chloride solution plays an important role in wood preservation. It has the following key functions

a. Antifungal effect: Zinc chloride has antifungal properties, which can effectively inhibit the growth and reproduction of fungi. Fungi are one of the main contributors to wood decay and decomposition. By applying a solution of zinc chloride, a barrier against fungi is created and the wood is protected from fungal attack. 

b. Anti-insect effect: Zinc chloride also has certain resistance to insects. It can inhibit the erosion of wood pests such as borers and termites, and prolong the service life of wood. 

c. Improve the water resistance and durability of wood: Zinc chloride solution can improve the water resistance of wood and reduce the penetration and absorption of water to wood. It also improves the wood's durability and reduces the risk of rotting and decomposition.

d. Prevent wood discoloration: Zinc chloride solution can effectively prevent wood discoloration due to oxidation or other chemical reactions. It preserves the natural color of the wood, extending its beauty and appearance.

e. Improve the stability of wood: When wood is exposed to the environment, it will expand or shrink under the influence of factors such as humidity and temperature. The zinc chloride solution penetrates the wood fibers, making them more stable and reducing wood warping and cracking caused by changes in humidity.

f. Increase the fire resistance of wood: Zinc chloride solution has certain flame retardant properties, which can improve the fire resistance of wood. This is very important for some wood applications that need to be used in high temperature environment, such as building materials and furniture.

Zinc chloride solution has multiple functions in wood preservation, such as anti-fungal, anti-insect, improving wood performance, preventing discoloration, improving stability and increasing fire resistance. Reasonable selection of an appropriate concentration of zinc chloride solution and applying it to the wood in the correct way can effectively protect the wood from fungus and insects, and improve its durability and waterproof performance.

How to Use Zinc Chloride Solution for Wood Preservation

a. Prepare the solution: select the appropriate concentration ratio according to the needs. In general, the concentration of zinc chloride solution is between 5% and 10%. A zinc chloride solution of the desired concentration is prepared by adding an appropriate amount of zinc chloride powder into water and stirring thoroughly to dissolve.

b. Treat Wood: Clean the surface of the wood to make sure it is dry and clean. Apply the zinc chloride solution evenly to the surface or interior of the wood by spraying, brushing or soaking. Make sure the wood absorbs the solution well and saturates it into the wood fibers.

c. Drying and Curing: Treated wood should be dried and cured in a well-ventilated area. This ensures that the solution penetrates completely and forms a protective layer.

d. Precautions: Proper precautions should be taken when using zinc chloride solutions for wood preservation. Wear gloves and goggles to avoid direct contact with the solution. Ensure that the operating environment is well ventilated and avoid inhalation of solution vapors.

e. Brushing method: Use a brush to evenly paint the zinc chloride solution on the wood surface. Make sure the solution adequately covers the entire wood surface, including edges and holes. If you need to treat the interior of the wood, you can choose the soaking method, which completely soaks the wood in a zinc chloride solution.

f. Spraying method: Use a sprayer to evenly spray the zinc chloride solution on the wood surface. Adjust the spray pattern and pressure of the sprayer to ensure the solution covers every part of the wood evenly.

g. Soaking method: completely immerse the wood in the pre-prepared zinc chloride solution to ensure that the wood is fully soaked. Depending on the size and needs of the wood, an appropriate soaking time can be chosen, usually ranging from a few hours to a few days. After soaking is complete, remove the wood and place in a well-ventilated area to dry and cure.

h. Drying and curing: The treated wood should be placed in a well-ventilated place for drying and curing. This helps the solution penetrate and form a protective layer. Make sure the wood is completely dry before any further treatment or use.

Please note that when using zinc chloride solutions for wood preservation, relevant safe practice guidelines should be followed and adjusted to specific needs and recommendations. Treated wood may have a certain odor, so it should be ventilated when used indoors. Additionally, depending on the treated wood use and environmental requirements, additional corrosion and protection measures may be required.

Concentration ratio

Zinc chloride solution is typically used at a concentration of 5% to 10%. According to specific needs, it can be adjusted according to the suggestion and actual situation.

Data and Examples

According to research and practice, zinc chloride solution is widely used in wood preservation and has achieved good results. For example, a study in which different concentrations of zinc chloride solutions were tested showed that a 10% zinc chloride solution had the best antifungal effect on wood. Similarly, zinc chloride solutions are used to protect projects such as timber bridges, building structures and ships, effectively extending their lifespan.


Zinc chloride solution, as a commonly used wood preservative, has the functions of antifungal, insect repellent and improving wood properties. Using a zinc chloride solution of the proper concentration, applied to the wood in the correct way, will protect the wood from fungus and insects and improve its durability and water resistance. When choosing the concentration ratio, it should be adjusted according to specific needs and suggestions. By judicious use of zinc chloride solutions, we can extend the lifespan, quality and sustainability of wood.



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