The so-called silica refers to the existence of siloxane chains in its molecules, which are two concepts with ordinary silica. The common component of quartz sand is silica. . . . . . There is no sand in the silica gel.
Liquid silica gel and solid silica gel mainly belong to the category of silicone. Solid silica gel is generally a high-temperature glue with high curing temperature, high temperature resistance and high strength. Liquid silica gel is softer and more transparent. Both can be used to produce nipples.
The promotion of domestic nipple market is mainly liquid silicone.
As long as they are produced by qualified manufacturers according to standards, both are safe.