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When using silicone to make molds, we often encounter mold shrinkage. HANAST Silicone will now analyze and explain why silicone molds shrink and how to solve this problem.

Industrial-grade mold silicone curing is a process of liquid to solid transformation. Shrinkage occurs due to differences in molecules and densities. Good silicone has a low shrinkage rate, while poor-quality silicone shrinks significantly.

1. All materials have a certain degree of shrinkage. Silicone rubber has a relatively small shrinkage rate compared to many materials. A shrinkage rate of 0.5-1% is normal for condensation-type mold silicone, and around 0.2% for addition-type mold silicone.
2. Incorrect mold storage methods; molds should not be stacked.
3. The larger the product size, the more obvious the shrinkage.
4. For large-part molds, fiberglass cloth or gauze was not added during the molding process.
5. Demolding or premature production before the mold is fully cured can cause the silicone mold to deform and shrink.

Regarding the issue of high shrinkage rate in mold silicone, HANAST has summarized the following common methods:

1. Scale up the original mold proportionally.
2. Fill the mold with plaster solution when not in use. Remove the plaster product when production is needed; this will prevent shrinkage in subsequent production.
3. Reduce the proportion of hardener added. For example, reduce it from 3% to 2%.
4. For large products, add fiberglass cloth to the mold to prevent deformation or enlargement.
5. The mold must be demolded within a specified time of at least 6-8 hours and can only be used for production after 24 hours.

We hope these methods are helpful. Purchasing HANAST mold silicone can provide you with various solutions for mold making. Welcome your inquiries.