How to detect whether silica gel desiccant still has moisture absorption function?

Silicone moisture-proof beads are also called desiccant, which is a kind of dry and hygroscopic articles commonly used in our daily life. In many food packaging, clothes and shoe boxes, a small packet of desiccant will be seen. But how to determine whether the silica gel desiccant still has a moisture absorption effect is very important. Now I will teach you a simple identification method how to detect the desiccant: 1. Pour a small cup of cold water, tear open the desiccant bag, and put it inside. Pour the silica gel particles into the water to see if the silica gel particles will explode into fragments and make a "chacha" sound. If yes, it is effective.
2. Take a small bag of desiccant and weigh it. This requires related weighing tools, and then mark it and place it indoors. Weigh it every 5-10 days to see if the weight will increase. effective. Because it absorbs the relevant water.
3. Disassemble the desiccant and observe the granular silica gel inside. If the silica gel is yellowish and has a large number of broken beads, it is a secondary material, and it has no moisture absorption effect. Then crush the noodle raw material to see if it is glass. Beads act as silica gel, beware of counterfeit and shoddy products.
4. Silica gel desiccant is a highly active adsorption material, usually prepared by reacting with sodium silicate and after a series of post-treatment processes such as aging and acid foaming. It is non-toxic and harmless.
It should be noted that although silica gel will not explode in contact with water and is non-toxic and harmless, it is still not to be swallowed. It does not react with any substances except strong alkali and hydrofluoric acid.