What is the best curing agent addition ratio for addition silicone?

What is the best curing agent addition ratio for addition silicone?
The best curing agent addition ratio for addition silicone usually depends on the specific type of silicone and the application scenario. Here are some common situations:
Conventional addition mold silicone: The general ratio is 1:1 (weight ratio), which is suitable for most conventional mold making applications. It can be vulcanized at room temperature or heated conditions and can meet general curing speed and performance requirements.
Highly transparent addition silicone: such as pad printing silicone head, coating silicone, etc., the ratio can be 9:1 or 10:1 (weight ratio). Taking 10:1 as an example, at this ratio, the silicone may have better transparency, softness and specific physical properties after curing, which is suitable for applications with high requirements for transparency and touch, such as food molds, pad printing silicone head manufacturing, etc.
Foaming silicone: It is a type of addition silicone. The recommended ratio is curing agent: raw material = 1:1. At a curing temperature of 120℃, the curing time is 13-20min, which can achieve a good foaming effect, high foaming multiple, uniform foaming and good stability, and small foam pore size and uniform and delicate.
However, in actual operation, the following factors may need to be considered to fine-tune the curing agent addition ratio:
Ambient temperature: Although addition silicone is not greatly affected by temperature changes, under extreme temperature conditions, if the temperature is too high, the amount of curing agent may be appropriately reduced, and if the temperature is too low, the amount may need to be slightly increased to ensure the stability of the curing time and effect. But generally speaking, the above conventional ratio is sufficient at room temperature (20-25℃).
Operation time requirements: If you want to extend the operation time, you can appropriately reduce the curing agent ratio; if you need to cure quickly to improve production efficiency, you can appropriately increase the amount of curing agent within a certain range, but be careful not to overdo it, otherwise it may affect the performance of the silicone, such as increasing hardness and decreasing toughness.
Silicone performance requirements: Different applications have different requirements for silicone performance, such as hardness, tensile strength, tear strength, etc. These properties can be changed to a certain extent by adjusting the curing agent ratio. For example, increasing the curing agent ratio may increase the hardness of the silicone, but the tensile strength and tear strength may decrease. It is necessary to find the best balance point according to the specific performance requirements.