What is Mastic Sealant? – The Constructor

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Mastic is a form of sealant or adhesive used to fill the joints or as a bond for different materials and gaps. It is an elastic and flexible material used to create a durable bond between two different surfaces or to protect a particular surface.

This article discusses the features of mastic sealants in the construction industry.

Features of Mastic Sealant

1. Mastic sealant is an all-purpose sealant used on a wide range of materials like aluminum, glass, marble, wood, plastics, ceramic, steel, etc.
2. These sealants can be used to seal or bond two different materials. For example, it can bond wall tiles with a porcelain floor tile (or any other tile material) to minimize leaks.
3. Mastic sealants are widely used in metal units as they are corrosion-resistant.
4. These sealants can be used for outdoor projects as they are temperature, water, and UV-resistant. 
5. Mastic sealants can be applied on the surface right away without the need for primer. 
6. Mastic sealants are available in different varieties: for example, waterproof mastic, anti-mold sealants, window and door mastic sealants, etc. There are also universal mastic sealants by different manufacturers, which are used for multiple jobs.
7. Mastic sealants are commonly used for the following applications:
   1. To bond the ceiling, wall, or floor tiles
   2. Joint sealers for windows and doors
   3. To seal the joint area around the bathroom fixtures and sanitary appliances.
   4. To fill the cracks in masonry and concrete
   5. To fill movement joints in the wall or floor tiles
   6. To bond plywood panels
   7. To seal the seams in an HVAC system where HVAC tapes can’t reach.

Advantages of Mastic Sealants

1. The application of mastic on a surface requires less preparation.
2. It is used for both indoor and outdoor projects.
3. They are flexible and elastic; hence are more durable.
4. They are water-resistant and UV-resistant.
5. Mastic sealants can join two different types of materials with ease.
6. It has high corrosion resistance.

Mastic sealants or fillers cannot accommodate large movements. Its viscous nature makes it the best fit for thick areas of application. 

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