What is the reason for poor silicone curing of molds?

Liquid silicone is formed from the liquid state of silicone to the curing state, so it is inevitable that incomplete curing occurs during the curing process of liquid silicone. Therefore, the problem arises. What should we do if the mold silicone does not cure?

There are two types of liquid silicone: industrial grade condensed mold silicone and additive grade food grade liquid silicone. The curing principle of these two types of silicone is different, so the reasons for the non drying of silicone are also different, and the solutions are also different.
Industrial grade condensed liquid silicone is a type of silicone with a curing agent of 2% to 3%. It is generally used to make large silicone molds and has a relatively low cost. The curing agent for industrial grade condensed mold silicone is an organic tin curing agent, which mainly absorbs moisture from the air to achieve the purpose of curing.

There are two reasons why additive food grade liquid silicone does not solidify or does not solidify well. One is that the ambient temperature is too low, and the second is that silicone undergoes a toxic reaction. Because addition molding of silicone relies on temperature to catalyze the reaction of platinum water, too low a temperature can cause the silicone to solidify or the surface to become sticky after curing. The poisoning reaction of silicone occurs because the added silicone cannot come into contact with toxic substances containing nitrogen, phosphorus, and sulfur, which can contaminate the platinum catalyst and prevent the silicone from solidifying. So if the temperature is low, it is necessary to increase the ambient temperature, and heating measures can also be taken. In addition, it is necessary to ensure the hygiene and cleanliness of the operating environment.