(a) powder
1. Exterior
The appearance of the powder should be loose powder and no agglomerates.
2. Hygroscopicity
Before taking the powder to measure the hygroscopicity, first check whether there is any moisture outside the powder packaging paper bag. If there is, it is of course a hygroscopic performance. Then take a little powder from the bag and pour it on a piece of white paper. Pick up the white paper and use your thumb and forefinger to pinch it outside the paper. If it sticks to a piece, it indicates that the powder has absorbed moisture. If the powder is dusting. The use indicates that the quality is not good; if it is still loose fine powder, it indicates that it is a good powdering agent. The hygroscopicity of the wettable powder is larger than that of the general powder, but the medicament is used for watering, and the effect of hygroscopicity on it is smaller than that of the powder for dusting. However, moisture absorption is not always a good thing, because pesticides are prone to deterioration after being wet.
(2) Wettable powder
1. Exterior
It should be a very fine loose powder, no clumps.
2. Wettability
Use a large glass bottle filled with water, then gently pour a spoonful of wettable powder from the top onto the water with a small spoon. After 2 minutes, if it can be completely wet and gradually sink, it is moist. A wettable wettable powder; if the powder is still floating on the water, it is a poorly wettable agent. In this way, it is also possible to distinguish which one is a wettable powder, which is a powder for dusting, and a wettable powder which is easy to wet. Generally the powder is not wetted.
3. Suspension
Block the wetted glass bottle above, shake it back and forth 30 times, then place it for 10 minutes and take a look. If the liquid is still turbid, when the powder at the bottom of the bottle is not much, it is a wettable powder with better suspension; if more than half of it has been sunk or the liquid is nearly clarified, the suspension performance is not good; if all the powder When it has sunk to the bottom of the bottle, it is a wettable powder with poor suspension; if the agent is condensed into a mass, it means that it is not a good wettable powder.
(three) emulsifiable concentrate
1. Exterior
First look at the emulsification in the vial has been layered, and then see if it is already turbid, whether there is crystallization, any emulsification that is not stratified, not turbid and not crystalline is a good emulsifiable concentrate. The emulsified oil which has stratification, turbidity or crystallization is already deteriorated, and the effect is poor when used. Of course, if the emulsifiable concentrate is placed at a very cold temperature, crystals are found, and when it is dissolved at room temperature, it cannot be considered to be deteriorated.
2. Emulsifying
Pour a volume of emulsified milk into 19 parts of water, shake it for 30 times after mixing, then let it stand for half an hour to see if there is any oil or paste floating on the water, then take a look at the bottom. There is no sediment, and if not, it indicates that the agent has a good emulsifying power. When measuring emulsification, if the emulsifiable concentrate placed in the water can spread out quickly, turning white into the best emulsifiable concentrate, this kind of emulsifiable concentrate that can spread out without stirring, also called a strong diffusion emulsion. If there is obvious sediment, or there is oil slick on the water surface, the cream is a emulsification with poor emulsifying properties.
(4) Suspending agent
The suspending agent should be a slightly viscous, flowable suspension with a very small viscosity and uniformity. If stratification occurs due to long-term storage, it can still be regarded as a qualified product if it can be restored by hand shaking. If it cannot be re-formed into a uniform suspension, the sediment at the bottom will not shake and the suspension performance will be poor.
1. Exterior
The appearance of the powder should be loose powder and no agglomerates.
2. Hygroscopicity
Before taking the powder to measure the hygroscopicity, first check whether there is any moisture outside the powder packaging paper bag. If there is, it is of course a hygroscopic performance. Then take a little powder from the bag and pour it on a piece of white paper. Pick up the white paper and use your thumb and forefinger to pinch it outside the paper. If it sticks to a piece, it indicates that the powder has absorbed moisture. If the powder is dusting. The use indicates that the quality is not good; if it is still loose fine powder, it indicates that it is a good powdering agent. The hygroscopicity of the wettable powder is larger than that of the general powder, but the medicament is used for watering, and the effect of hygroscopicity on it is smaller than that of the powder for dusting. However, moisture absorption is not always a good thing, because pesticides are prone to deterioration after being wet.
(2) Wettable powder
1. Exterior
It should be a very fine loose powder, no clumps.
2. Wettability
Use a large glass bottle filled with water, then gently pour a spoonful of wettable powder from the top onto the water with a small spoon. After 2 minutes, if it can be completely wet and gradually sink, it is moist. A wettable wettable powder; if the powder is still floating on the water, it is a poorly wettable agent. In this way, it is also possible to distinguish which one is a wettable powder, which is a powder for dusting, and a wettable powder which is easy to wet. Generally the powder is not wetted.
3. Suspension
Block the wetted glass bottle above, shake it back and forth 30 times, then place it for 10 minutes and take a look. If the liquid is still turbid, when the powder at the bottom of the bottle is not much, it is a wettable powder with better suspension; if more than half of it has been sunk or the liquid is nearly clarified, the suspension performance is not good; if all the powder When it has sunk to the bottom of the bottle, it is a wettable powder with poor suspension; if the agent is condensed into a mass, it means that it is not a good wettable powder.
(three) emulsifiable concentrate
1. Exterior
First look at the emulsification in the vial has been layered, and then see if it is already turbid, whether there is crystallization, any emulsification that is not stratified, not turbid and not crystalline is a good emulsifiable concentrate. The emulsified oil which has stratification, turbidity or crystallization is already deteriorated, and the effect is poor when used. Of course, if the emulsifiable concentrate is placed at a very cold temperature, crystals are found, and when it is dissolved at room temperature, it cannot be considered to be deteriorated.
2. Emulsifying
Pour a volume of emulsified milk into 19 parts of water, shake it for 30 times after mixing, then let it stand for half an hour to see if there is any oil or paste floating on the water, then take a look at the bottom. There is no sediment, and if not, it indicates that the agent has a good emulsifying power. When measuring emulsification, if the emulsifiable concentrate placed in the water can spread out quickly, turning white into the best emulsifiable concentrate, this kind of emulsifiable concentrate that can spread out without stirring, also called a strong diffusion emulsion. If there is obvious sediment, or there is oil slick on the water surface, the cream is a emulsification with poor emulsifying properties.
(4) Suspending agent
The suspending agent should be a slightly viscous, flowable suspension with a very small viscosity and uniformity. If stratification occurs due to long-term storage, it can still be regarded as a qualified product if it can be restored by hand shaking. If it cannot be re-formed into a uniform suspension, the sediment at the bottom will not shake and the suspension performance will be poor.
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