When using silica gel or making mold with silica gel, you will more or less encounter silica gel sticking to the mold! No matter what material your mold is made of, it will stick to the mold to varying degrees! He and aluminum mold, copper mold, steel mold, glass fiber reinforced plastic mold will have a certain degree of adhesion!

Then why does it stick to the mold?

First of all, the liquid silica gel is a kind of dry and oily gel, and the silica gel made is dry and smooth. There is no oily isolation layer between the liquid silica gel and the mold surface, and it will adhere to the mold to varying degrees.

Secondly, if the surface of your mold is not smooth enough, the rougher the surface, the firmer it will be! The more firmly he sticks to your mold!
Also, if something on your mold reacts with silica gel, it will stick to the mold! Finally, when the silica gel is not completely solidified, it will stick to the mold! Do not remove the mold until it is completely cured!

How can we avoid this phenomenon and how can we solve it? Here are some ways to learn!

First, to prevent mold sticking, first of all, you should clean the mold before using it. When cleaning, you can use clean water and detergent. If you can't clean it, you'd better use Tianna water, alcohol, white electric oil, etc
Second, make the mold as smooth as possible, as long as the contact surface with silicone is smooth!
Third, do not use substances that will react with silica gel as silica gel molds.
Fourth, wait for the silica gel to completely solidify before taking the mold!

For silicone rubber, please check the details:
https://www.rtvsilicone.net/product-high-strength-grade-htv-silicone-rubber-.html