Take 1 part of the wettable powder, add 200 parts of water, and put it in a glass. Shake well and wait for a certain period of time to observe the suspension.
If the drug precipitates slowly, it indicates good suspension. In case of poor quality, silicone additives or 0.10% neutral laundry detergent should be added before use to increase moisturizing performance.
If the wettable powder binds to a hard block, it should not be used as a spray.
powder
If the powder absorbs moisture during custody, it needs to be placed in a cool, well-ventilated place to dry and not to be used in the sun or crushed.
If the agglomeration is serious, it can only be used as poisonous soil.
EC
In the course of custody of emulsion pesticides, if the storage is poor, the following three conditions may occur:
Caking phenomenon. If the emulsifiable concentrate has been a non-flowable viscous liquid or has formed a soapy solid, it is proved that the solvent has mostly volatilized and the quality has changed and cannot be used.
Precipitation crystallization phenomenon. For long-term storage of the emulsion, white crystals or turbid substances may appear on the bottom of the bottle. If the cream bottle is immersed in warm water at 30°C to 40°C, the crystals can be dissolved in about 30 minutes to return to a clear liquid, indicating that the quality is good and can be used. If it does not dissolve, it indicates that the quality of the emulsifiable concentrate has changed and cannot be used.
The emulsifying properties of the emulsion change. Take 1 part of EC, add 200 parts of water and place it in a glass. Shake well and wait for about half an hour. Observe the emulsification. If there is no slick in the upper layer, there will be no sediment in the lower layer and no oil bead in the middle, indicating good emulsification performance; There is emulsifiable concentrate, there is sedimentation, there is stratification after 10 minutes, indicating that the emulsion is destroyed can not be used.
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