6.3.10 Butyl Sealants

Rubber sealants represent an extensive category of sealants based on the IIR and polyisobutylene contained in many formulations. Butyls are plastic (deformable) and chemically non-reactive sealants. Generally, they do not change or cure but are subject to purely physical changes of state. No chemical reaction takes place during application or within the joint.

Butyls are generally 1C elastoplastic polymeric products, and the final properties are obtained immediately after application. Generally, the product is applied and a second substrate is attached and mechanically fixed. In the case of solvent-based products, the final properties are achieved as soon as the solvent has evaporated.

Butyls are suitable for low-tech applications such as air-handling duct work, sealing machinery cabs or other limited low-tech, low-cost applications. They should not be considered for highly engineered assemblies that require reliability and strength.

6.3.2 1c and 2C SMP Compositions

A 1C SMP adhesive cures using the moisture in the air, while 2C systems cure via an added water paste as a second component. This system makes 2C SMP adhesives cure much faster than 1C systems, independent of environmental relative humidity.

19) Proebster, Manfred. Industrial sealants. Landsberg am Lech, Germany: Verlag Moderne Industrie, 2004

20) Austerberry, Michael. ‘Silane-Modified Polymers (SMP) Combining the Best of Silicone & Organic Polymers.‘ International Silicone Conference –May 17, 2016. 2016. 1-25.

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