Small tricks to suppress the shrinkage rate of silicone in molds

The severe shrinkage of mold silicone is mainly due to the quality issue of the silicone raw material itself. If the quality is not up to standard, liquid rubber silicone it is normal for mold silicone with powder or waste rubber to have a severe shrinkage rate. So to reduce the shrinkage rate of mold silicone, it is necessary to use high-quality, well-known brands, and legitimate silicone raw materials produced by regular silicone manufacturers.

The shrinkage rate of condensed silicone is ≤ 2 ‰, and the shrinkage rate of added silicone is ≤ 1 ‰. In fact, it can also slow down the occurrence of shrinkage during mold flipping operations, such as adding fiber cloth and gauze after pouring glue during the mold flipping process, which can increase the toughness of the silicone mold and also slow down the shrinkage rate. When adding fiber cloth and gauze, attention should be paid to adding it before the liquid silicone is vulcanized, and it should be in contact with the silicone. Use a brush to press it as much as possible to make it adhere to the silicone. liquid silicone You can also use fiberglass and gypsum to create a better shell effect.

In addition to the quality and operation of silicone, there is also one thing that is easily overlooked, which is the issue of mold silicone preservation. Some customers simply place the silicone gel on the mold for convenience after use, and even fold it up. Incorrect placement can also cause severe shrinkage of the mold silicone. After use, the silicone gel needs to be cleaned thoroughly. The mold can be used as a filler with the mold or gypsum to fill the mold without deformation or easy shrinkage. It also needs to be stored in a cool place away from direct sunlight.
When unsure about the shrinkage of newly purchased mold silicone, sample testing can be conducted first before bulk procurement. Regular mold silicone manufacturers can provide free samples for testing silicone, and can produce materials that are suitable for your operation and use according to your usage requirements, habits, product requirements, and performance.