Dual group silicone sealant is the most common, which includes two types: condensation type and additive type. Generally, condensation type has poor adhesion to components and encapsulation cavities, and volatile low molecular substances are produced during the curing process, resulting in a significant shrinkage rate after curing. The addition molding (also known as silicon gel) has very small shrinkage and no low molecular weight is produced during the curing process. It can be quickly cured by heating.