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Mold silicone is a type of liquid silicone, which is further divided into condensation-type industrial-grade mold silicone and addition-type food-grade mold silicone. Condensation-type industrial-grade mold silicone is composed of oil-based silicone and an organotin curing agent, with the curing agent added at a ratio of 2-3%. Addition-type food-grade mold silicone consists of component A and component B, with component B containing a platinum catalyst; the ratio of component A to component B is 1:1.

Both condensation-type industrial-grade and addition-type food-grade liquid mold silicone have working time and curing time, also known as flowability time and setting time. Generally, liquid mold silicone is handled at ambient temperature. However, varying ambient temperatures in different regions directly affect the working and curing times of liquid mold silicone.

So, what are the working and setting times of mold silicone?

The working time of liquid mold silicone refers to the time during which the silicone can continuously flow and operate at room temperature. At an ambient temperature of 25 degrees Celsius, the working time for pouring mold silicone is generally 30-40 minutes, and the working time for brushing mold silicone is generally 10-15 minutes. Working time refers to the time from when the hardener is added and stirred until the silicone begins to undergo crosslinking and becomes non-flowable. During this time, the liquid silicone can continue to flow and be used continuously.

The setting time of liquid molding silicone is directly proportional to the working time; the longer the working time, the longer the curing time, and vice versa. Under normal circumstances, the curing time for molding silicone is 3-4 hours from the start of stirring. However, the setting time is also affected by temperature; higher temperatures result in faster setting, while lower temperatures result in slower setting.