1: There are many kinds of glycerol. Although they are all above 99% purity, there are still impurities in them, and the content is below 0.3%. Don't underestimate the impurities in this ratio, which will directly affect your products.

At the same concentration of glycerol, plants are much more stable than animals, and it is more difficult to change color when heated at high temperature.

The temperature of 3: 280 degrees is really high. At this temperature, glycerin is easy to change color unless the quality is very good.

Suggestion: 1: Replace glycerol with other substances. The highest heating temperature of glycerol I am exposed to is only 2 10 degrees, which is 280 degrees. See if we can replace it with other non-toxic substances.

2. The purest plant glycerin, such as the USP-rated plant glycerin in the United States, should not be used if the concentration is lower than 99.5%, which is easy to be uncertain.

FYI-Experience from a glycerol salesman.