Silica gel type is divided into liquid silica gel and solid silica gel, their shelf life is different.Here we focus on the preservation conditions and shelf life characteristics of liquid silica gel, and the liquid silica gel can not be used for how long it is placed.
Liquid silica gel is composed of silica gel and curing agent, divided into condensed industrial grade liquid silica gel and molding food grade liquid silica gel.
The ratio of condensed industrial grade liquid silica gel is 100:2 or 100:3;Add molding food grade liquid silica gel is mostly 1:1, and there are some 10:1 ratio.Whether it is condensation industrial grade liquid silica gel or molding food grade liquid silica gel, their storage conditions are placed in the shade, can not be placed in the high temperature exposure environment for a long time.The use period of liquid silica gel is about 3 months, more than 6 months later, the water of liquid silica gel will evaporate, silica gel will precipitate to cause the viscosity of silica gel to rise and thicken.
So how long can the liquid silica gel be placed? It is generally placed for 12 months, and the silica gel is no longer of use value.After 12 months of placement, silica gel precipitation is particularly serious, viscosity increases, basic no liquidity and operating performance.In this case, the condensation liquid silica gel is more serious than the molding liquid silica gel, because the viscosity of the condensation liquid silica gel is much higher than the molding liquid silica gel under the same performance parameters, and it will be easier to thicken.Liquid silica gel placed for a long time, even if it can be cured by operation, then the tear resistance, tensile strength and elongation after curing will decrease, and it cannot be durable.
Therefore, silica gel manufacturers should inform customers before shipment that the silica gel received should be used up after 6 months. If it is not used up after more than 6 months, the silica gel should be stirred evenly in the bucket before the next use and then taken to the ratio of curing agent.
