1. Curing performance of silicone building sealant 
     One-component sealant seals are stable inside the container and will solidify when they are exposed to air. This is a chemical reaction process, after the sealant comes into contact with the air, the base glue, cross-linking agent, and catalyst in the sealant will react with the water in the air and gradually become an elastic solid, which is the curing of the sealant. After the sealant is punched, the surface of the sealant is the first to come into contact with water, so it is the surface that cures first. After the surface is cured, the water seeps into the surface that has been cured, and the inner layer is cured again, and the sealant is gradually cured from the surface to the inside, and the longer the time, the thicker the cure. The thicker the sealant, the longer it will take to fully cure, usually 3-6mm thick in 24 hours. 

Two-component sealants are carried out by a chemical reaction between components A and B. Components A and B are stable when stored separately and sealed, and once they are mixed, they begin to react, so they should be used immediately after the A and B components are mixed. The two-component curing reaction does not require the participation of moisture in the air, so its curing is carried out by the inside and the surface at the same time, and the complete curing time is independent of the thickness of the glue, so the reaction is not related to whether it is exposed to air or not, as long as the A and B components are mixed together, it will cure even in a closed state. 

2.Several concepts in the curing performance of sealant: 
Surface dryness: The sealant is paste-like when it is punched out, and when you touch its surface with your fingers or other materials, the rubber will adhere to your fingers or materials. After the sealant is punched out, the surface contact water begins to solidify the crust, and when the epidermis is formed, when the finger or material touches the surface, there will be no more glue adhering to the finger or material. This is called the surface stem. 

Drying time: The time when the sealant is punched out of the container is recorded, and the time it takes to dry it is the drying time. 

Detack: After the sealant surface is dry, touch the surface with your fingers, although there is no glue adhering to the fingers, you can still feel a certain adhesion between the glue surface and the fingers, this phenomenon we call no adhesion. This is a manifestation that the curing reaction of the glue surface has not yet been fully carried out. Over time, it will further solidify until the surface forms a layer of elasticity and strength that feels dry and does not feel sticky when touched with your fingers, which we call deadhesion. 

Debonding time: When the sealant is knocked out of the container, the time required for it to be detacked on its surface is the debinding time. 

3. Factors affecting the curing performance of sealant 
     Environmental factors have a significant impact on the curing properties of sealants. The first is the influence of temperature, the higher the temperature, the faster the curing reaction speed, the phenomenon is that the surface drying, adhesion is relatively fast, if the temperature is very low, such as below 5 °C, the sealant curing will be very slow. If the temperature is too high, such as above 40°C, the sealant will dry too quickly and be inconvenient to use. Humidity also has a significant effect on the curing performance of the sealant, because the sealant curing reaction requires moisture in the air, so too dry weather such as relative humidity below 40°C is not good for the curing of the sealant. However, the higher the humidity, the better, because the sealant should release volatile small molecules when curing, and if the air humidity is too large, the small molecules are not easy to volatilize, which is not conducive to the curing of the sealant. Experiments have shown that when the relative humidity is higher than 80°C, the sealant is affected by the de-adhesive and deep curing, and sometimes after 2-3 days, the surface of the sealant is still sticky. The standard conditions for the performance of sealants specified in the national standard are temperature (23±2) °C and relative humidity (50±5) °C.

About injection liquid silicone rubber,please check the details: High Strengh Liquid Silicone Rubber IOTA 28-Series
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