Nowadays, more and more people like to make their own handmade or food molds, and many will choose food grade liquid mold silicone to make them because they are easy to operate and do not require any equipment; But we often encounter feedback from some customers about why molds made of food grade liquid molds made of silicone have sticky surfaces, like they do not solidify. So today, we will analyze the reasons and determine what exactly caused them.
The main reasons for non curing or surface sticking of food grade silicone are as follows:
The curing temperature of food silicone during operation is too low.
2. The AB component of food silicone is not mixed strictly according to the specified proportion
3. Incomplete mixing during the mixing process
4. The mixing container is not clean or the mixing tool is not clean
5. The surface of the original mold has not been treated (especially if the original mold contains heavy metal elements or contains nitrogen, sulfur, tin, arsenic, mercury, lead, etc.)
6. The original mold material is polyurethane resin.
Solving these problems is relatively simple:
It can increase the curing temperature of food grade silicone, and one advantage of increasing the curing temperature is that it can shorten the curing time; During the mixing process, strictly follow the mixing ratio provided by the manufacturer, for example, common mixing ratios for food grade silicone include 1:1 and 10:1; When mixing food grade silicone AB components, be sure to use a clean container and mixing tool.
If conditions permit, try to spray a layer or even multiple layers of release agent on the surface of the mold as much as possible. The release agent can effectively block the contact between the silicone and some chemical substances inside the mold that cause the silicone to not solidify and the silicone.
Post time: Apr-08-2023