How to solve the problem of high shrinkage of silicone molds?

Shrinkage of silicone molds is a normal phenomenon, and any mold that becomes a mold after curing with silicone will experience shrinkage. Shrinkage occurs when a silicone liquid has different molecules and densities when it is solid, and when a liquid is converted into a solid, the product undergoes shrinkage. Good silicone has a low shrinkage rate, while poor silicone has a higher shrinkage rate. The direct result of silicone shrinkage in molds is that the size of the products flipped out varies, and high-quality additive molds have a silicone shrinkage rate of ≤ 0.1%.

The reason for the high shrinkage rate of mold silicone:
1. Any material has a certain degree of shrinkage, and silicone rubber has a relatively small shrinkage rate compared to many materials;
2. The storage method of the mold is incorrect;
3. The larger the product size, the more obvious the shrinkage;
4. Do not add fiberglass cloth for large products;
5. Moulding masters often do not mix the adhesive according to the manufacturer's AB component mixing ratio, but increase the proportion of curing agent based on their own experience;
6. The mold is not fully cured, and the hardness of the silicone is not stable. Urgent demolding or early production results in the silicone mold being prone to deformation and shrinkage.

Solution to high shrinkage of silicone molds:
1. After the mold is made, it is better to leave it for 24 hours before use;
2. Enlarge the mold according to the shrinkage size;
3. When saving the mold after use, place the mold seed in the product and save it together. If it is an oversized product, it can be preserved by pouring gypsum;
4. Adding gauze or fiberglass cloth when opening molds for slightly larger products;
5. The split mold must be made into an outer mold.