Silicone adhesives for elastic bonding and sealing

The required function determines the choice. Three Bond 1221G and 1221H are described as RTV silicones for bonding, sealing, coating and potting electrical and electronic components; contact with moisture produces an elastic adhesive seal. Three Bond 1207C is described as an RTV silicone liquid gasket for sealing faces on water pumps, heat exchangers and oil pans. A shared material does not mean the products have the same suitability for loads or components. Define whether the joint must hold parts together, seal a gap, or do both.

That depends on the particular system. The one-component Three Bond 1221G and 1221H products react with moisture in the air to form an elastic adhesive seal. Surface drying and through-cure are distinct stages; through-cure depends on layer thickness, ambient temperature and relative humidity. A dry surface does not, by itself, establish that the joint is ready for loading. Check the geometry, application method and required cure against the individual product data.

When the specific application requires documented heat transfer alongside a sealing or potting function. The product record for Three Bond 1225C states thermal conductivity of 1.59 W/m·K and describes thermal potting and sealing applications in electronics. This property belongs to that product; it does not apply to every silicone adhesive in the listing. The thermal task, components, application geometry and other material requirements all need to be checked.

Provide details of both parts, their surfaces, the intended bonding or sealing function, and the gap or bond-line geometry. Add the expected loads, environment and application steps. For moisture-curing systems, layer thickness, temperature and humidity are particularly relevant to cure; a sealing task also needs its own description. With this information, the adhesive technology team at Krückemeyer GmbH can check suitable product data and discuss the next selection step with you.