Silicone rubber mold is made of silicone rubber as raw material. No matter what kind of silica gel mold is, it has a little shrinkage. The degree of exponential shrinkage is different. Shrinkage has little impact on the products that are not very precise. After all, the degree of shrinkage is very small.
Silicone rubber molds include molds made of industrial grade silicone rubber and molds made of food grade silicone rubber. The degree of shrinkage varies according to their types. Industrial grade silica gel is a condensation type silicone rubber, with the shrinkage rate less than 0.2%. The characteristics of condensation type silica gel depend on the degree of vulcanization and the additives used. Food grade silicone rubber is an additive silicone rubber with a shrinkage rate of less than 0.1%. Food grade silicone rubber is a safe and healthy silicone rubber, mainly used in tableware applications. Its structure is stable, and it is an inorganic polymer material formed by the condensation of silicic acid. Generally speaking, silicone rubber mold shrinkage has little impact, unless some large molds have some impact, but it can be avoided with normal maintenance.
matters needing attention:
1. Silicone rubber molds should be stored in a dry environment, because silica gel is a highly adsorptive material.
2. During demoulding, the mold should be completely solidified before being removed, otherwise, the silicone mold will be deformed and shrunk.
3. When using, you should read the instructions and make the mold according to the manufacturer's instructions. The silicone mold is prepared according to the manufacturer.
4. The larger the silica gel mold is, the easier it is to shrink. You should be careful when using it.
5. Use gauze to prevent mold deformation and shrinkage.
6. After using the silicone mold, it needs to be cleaned in time.
Some silicone rubber molds are used in special environments. Shrinkage is a normal phenomenon when they are used for a long time. With the progress of technology, many silica gel molds now have good anti shrinkage characteristics. It is recommended that you choose manufacturers to purchase silicone rubber molds to ensure the quality assurance of batch purchase of silicone rubber molds.
For silicone rubber, please check the details:
https://www.siliconerubbers.net/product-standard-grade-htv-silicone-rubber.html 
