The difference between transparent silica gel desiccant and color-changing silica gel desiccant
Another thing to pay special attention to is that there is some waste and substandard silica gel desiccant
. It should be colorless and transparent, but due to the reasons in the production process, or has been scrapped, there will be some yellow, light yellow, black, brown, white, milky white silica gel desiccant
, the price of these is very cheap.
White transparent silica gel desiccant is a non-toxic, environmentally friendly desiccant, mainly used in moisture-proof products such as food and medicine. The blue color of the color-changing silica gel desiccant is toxic, so it cannot be used for food and medicine.
The main function of the color-changing silica gel desiccant is to act as a moisture indicator. The color-changing silica gel desiccant
will gradually change its color after absorbing moisture.
The following simple methods can be used to judge whether the silica gel desiccant
1. Tear off the silica gel desiccant
packaging bag, take away the silica gel raw materials, hold your hands tightly, and see if there is heat. The heat dissipation indicates that the silica gel desiccant is still effective.
2. If blue or orange silica gel desiccant particles are added, if the silica gel particles change color, it indicates that the silica gel desiccant has expired.
3. Holding a small cup of cold water, tear open the silica gel desiccant
bag, and then pour the raw materials into the water. It will be effective if the silica particles are blown into pieces and make a "just" sound.
4. Take a small bag of silica gel desiccant
, weigh it, make a mark, and pour a small cup of boiling water at the same time, spread the silica gel desiccant
on the mouth of the cup, and then weigh it again. Check it every 1-2 hours.