What are the storage conditions and shelf life of wood fungicides?

Basic characteristics of wood fungicides
Wood fungicides are a class of chemical agents used to prevent wood from rotting, discoloring or mildewing due to microbial invasion. Common wood fungicides include copper-based fungicides, organic iodine fungicides, quaternary ammonium salt preparations, etc. The ingredients and proportions of these products are different, and their storage requirements are also different.
Since most wood fungicides contain active ingredients and are sensitive to environmental factors such as temperature, humidity, and light, a reasonable storage method has a direct impact on maintaining their effectiveness. If stored improperly, it may cause degradation, precipitation, volatilization of active ingredients, and even cause safety hazards such as corrosion and leakage.

Ideal environmental conditions for storing wood fungicides
In order to ensure that wood fungicides maintain their chemical stability and use effect during storage, they should be managed from the following aspects:
1. Temperature control
Wood fungicides should be stored at room temperature (generally 5°C to 30°C). Extreme high temperatures may accelerate the decomposition of ingredients or volatilize some solvents, and low temperatures may cause crystallization or stratification, affecting the uniformity and penetration effect during use. Some product packaging will have reminders such as "avoid high temperature exposure" or "freeze-proof storage", which should be strictly followed.
2. Humidity protection
Especially powdered or hygroscopic liquid fungicides, which are easy to absorb water and agglomerate in a humid environment, change physical state and even reduce sterilization ability. They should be stored in a dry place. It is recommended to equip the warehouse with dehumidification equipment, and it is more appropriate to control the humidity below 60%.
3. Storage away from light
Ultraviolet rays may accelerate the degradation of some chemical components, especially fungicides containing photosensitive organic components. The product should be placed in a light-proof environment or use a light-shielding packaging container to avoid direct sunlight.
4. Sealed storage
The fungicide should be sealed in time after use to prevent oxygen, water vapor, etc. in the air from entering the bottle to cause oxidation or hydrolysis reactions. Liquid products should use the original sealed container, and barreled products should be used up as soon as possible after opening.
5. Keep away from fire and oxidants
Most fungicides contain flammable or reactive components. They should be stored away from open flames, high heat sources and strong oxidizing substances. Some fungicides are also listed as hazardous chemicals and must comply with local safety or fire regulations when stored.

How long is the shelf life of wood fungicides
The shelf life of wood fungicides usually depends on their specific type and formula:
*Liquid fungicides (such as copper azole, ACQ, quaternary ammonium salts, etc.): The shelf life is generally 12 to 24 months. When stored properly, some can be extended to 3 years, but the bactericidal efficiency may be affected after exceeding the recommended period.
*Powder or granular fungicides: relatively stable, with a shelf life of 2 to 3 years or even longer, but attention should be paid to moisture and oxidation prevention.
*Self-prepared raw material package: that is, the fungicide ingredients are proportioned by the user, and the shelf life must be controlled according to the characteristics of each ingredient when the raw materials are stored separately. Active ingredients such as isothiazolinones generally do not exceed one year.
The specific shelf life shall be subject to the product label or manufacturer's instructions. Before actual use, the product should be checked for abnormal conditions such as precipitation, stratification, odor, color change, etc. If changes are found, use it with caution or contact the manufacturer for confirmation.

Precautions for extending the use cycle of wood fungicides
If you want to extend the use cycle of wood fungicides without affecting the effect, you can refer to the following practices:
*Purchase on demand to avoid excessive stockpiling;
*Shake or stir thoroughly before use, especially for liquid products that have been stored for a period of time;
*For fungicides that are about to expire, give priority to occasions where the bactericidal effect is not required, such as storage boards, simple wooden structures, etc.;
*Establish a warehouse management ledger to record the storage date, batch number, usage and remaining amount of the fungicide for periodic inspection.

Scientific storage is the premise of using wood fungicides
The effect of wood fungicides is greatly affected by storage conditions. Maintaining constant temperature and humidity, avoiding light, fire prevention, moisture prevention, and sealed management are basic storage requirements. Different types of fungicides have different shelf lives. It is recommended that users store them scientifically according to the product instructions and use them in time to avoid waste of resources or safety risks caused by improper storage.
Through standardized storage and management, it not only helps to extend the service life of wood fungicides, but also helps to ensure that their bactericidal properties are fully utilized in practical applications. For wood processing plants, home furnishing manufacturing companies or wood structure construction units with high frequency of use, formulating detailed storage standards and daily inspection systems is a basic work worth investing in.