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How long has liquid silicone been unused?

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How long has liquid silicone been unused?

Silicone types are divided into liquid silicone and solid silicone, with different shelf lives. Let's focus on the storage conditions and shelf life characteristics of liquid silicone, as well as the length of time it is left unused.

Liquid silicone is composed of two parts: silicone and curing agent, which are divided into condensed industrial grade liquid silicone and additive food grade liquid silicone.

The ratio of condensed industrial grade liquid silicone is 100:2 or 100:3; The majority of additive food grade liquid silicone is 1:1, and there is also a portion with a ratio of 10:1. Whether it is condensed industrial grade liquid silicone or additive food grade liquid silicone, their storage conditions are kept in a cool place and cannot be stored in high temperature exposure for a long time. The service life of liquid silicone is about 3 months. After more than 6 months, the water in the liquid silicone will evaporate, and the silicone will precipitate, causing the viscosity of the silicone to increase and thicken.

So the liquid silicone cannot be used for as long as it has been stored for 12 months, and the silicone is no longer useful. After 12 months of storage, the silica gel showed particularly severe precipitation, increased viscosity, and almost no fluidity or operational performance. In this case, the performance of condensed liquid silicone is more severe than that of additive liquid silicone, because the viscosity of condensed liquid silicone under the same performance parameters is much higher than that of additive liquid silicone, and thickening phenomenon is more likely to occur. Even if the liquid silicone can be cured after being placed for a long time, its tear resistance, tensile strength, and elongation will decrease after curing, making it not durable.

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