Addition type liquid silicone rubber and condensation type liquid silicone rubber are two different types of liquid silicone rubber, and their curing methods have the following differences:

Chemical reaction mechanism: addition liquid silicone rubber is cured by Addition reaction. Addition reaction refers to the Addition reaction between silicon hydrogen bond (Si-H) and alkenyl (such as olefin) to form silicon carbon bond (Si-C) during the curing process. This reaction is achieved through the presence of a catalyst.

Catalyst: Addition of liquid silicone rubber usually requires the addition of a catalyst to promote the curing reaction. Common catalysts are platinum catalysts, such as Chloroplatinic acid or platinum alkyl compounds. The presence of catalysts can accelerate the curing rate.

Moisture requirement: Molded liquid silicone rubber is sensitive to moisture. During the curing process, silicon hydrogen bonds react with water to produce hydrogen gas, so it is necessary to keep the environment dry to avoid bubbles or other defects during the curing process.

Adhesion: Additive liquid silicone rubber can adhere to various substrates during the curing process, including metal, plastic, and glass. This makes it widely applicable in various application fields.

In contrast, the curing method of condensed liquid silicone rubber has the following characteristics:

Chemical reaction mechanism: condensed liquid silicone rubber is cured by Condensation reaction. Condensation reaction refers to the reaction between silicon hydrogen bond (Si-H) and silicon oxygen bond (Si-O-Si) to produce silicon oxygen silicon bond (Si-O-Si).

Gel process: condensed liquid silicone rubber will go through the gel stage during the curing process. At this stage, the liquid silicone rubber begins to become viscous and form a gel shape. Then, the gel is further solidified to form an elastomer.

Moisture requirements: Compared to addition molded liquid silicone rubber, condensed liquid silicone rubber has lower moisture requirements. The moisture content in the curing process has no obvious influence on the speed and effect of Condensation reaction.

Applicability: Condensed liquid silicone rubber is usually suitable for applications that require high strength and durability, such as sealing, coating, and electronic packaging.