Joint Sealant

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Definition - What does Joint Sealant mean?

This is a polymer-based gasket used in building and construction design applications to fill and protect joints between two substrates. It is used to seal joints, gaps and openings between two or more substrates to prevent environmental elements that provide conditions that may lead to corrosion. It is designed to protect joint edges from corrosion in concrete and clay tiles.

Corrosionpedia explains Joint Sealant

In order to accommodate structural and thermal changes, there are various types of sealants used in residential and light commercial application on sidewalks, pavements, airplane runways, plazas, balconies, terraces, industrial floors and swimming pool floors. The design of joint sealants is dependent on the substrates used to provide the joints. It is available in preformed and liquid-applied forms. Aesthetics must also be considered when manufacturing the sealant.

For a long-lasting sealing, the physical, chemical and durability properties are required to withstand the types of joints. However, the temperature and type of joint (movable or static) factors of the system will determine the preferred joint sealant. The polymers used include latex, butyls and acrylic, polysulfide, hybrid polyurethanes, silicones, urethane and advanced sealants (factory preformed).

Some of the properties required to increase the performance of the joint sealant include:

  • UV-resistant
  • Non-chalking, non-staining and self-cleaning
  • Resists penetration and abrasion
  • Flexibility when exposed to weather and aging
  • Excellent resistance to physical and chemical reactions
  • Quick curing and water-tolerant

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