curing of silicone-based RTV-1 sealants

The group of silicones includes a vast diversity of products such as silicone oils, silicone resins, and silicone rubbers. The first silicone elastomers to be produced were developed in 1943 by General Electric. Later on, also systems were formulated that allow curing / vulcanisation at room temperature. In this case, the chemical reaction is called “cross-linking”. These types are denoted as RTV (room temperature vulcanisation) types. The RTV sealant cross-links at about 20°C due to contact with humidity in air. The higher the relative air humidity, the faster the chemical conversion can take place. Also the temperature has a substantial influence on the speed of reaction. At greater heat, the chemical reaction proceeds faster, while low temperatures slow it down. However,
if there is no humidity, these systems will not react, even at high temperatures. Therefore, RTV-1 sealants cure faster in summer than in winter.