Three methods to distinguish whether the powder pesticide is invalid

Observation:

If the powder pesticide has been agglomerated, it is not easy to be broken, and it proves to be invalid and can no longer be used.

Suspension method:

Take 50 grams of powder pesticide, put it in a glass bottle, add a little water to make a paste, add a proper amount of water and mix well, place it for 10~20 minutes. The good pesticide powder is fine, less and the precipitation is slow; the pesticide powder is invalid. The precipitation is fast and numerous.

Combustion method:

Take 10-20 grams of powder pesticide, put it on a metal sheet and put it on fire. If it is white smoke, it proves that the pesticide has not failed, otherwise it will be invalid. This method is usually used to identify 5% of carbendazim powder.