A cheat sheet to help you.
Both sealants and adhesives have built up a long list of products and terminology, but are these interchangeable?
These two construction materials are similar on a fundamental level but serve different primary goals.
Get the proper level of protection and performance in an application, with this explainer.
Adhesives vs sealants
On the surface, comparing the function of silicone adhesives vs. silicone sealants is simple, but there are many differences in practice. While some adhesives may also be a sealant, it is not generally the primary function.
Sealants
Sealants consist of a flexible material that usually contains an elastomer. The chemical structure creates a paste-like consistency that makes it perfect for filling gaps between component surfaces. Key functions:
- Prevent liquids from passing through joints or openings.
- Help surfaces to accommodate movement.
- Provide a barrier against air, dust and sound.
Adhesives
Adhesives join two surfaces, providing structural stability through bonding. They can take the form of epoxy, glue, liquid, paste, film and tape.
Some construction tapes can replace screws or anchors, holding building elements structurally in place. The choice to use tapes over sealants, or even other adhesives, is due to:
- Less labour investment – no curing time.
- Greater range of material options for design.
- Adheres to traditionally challenging surfaces.
- Can immediately be transported or stored vertically, saving space.
With so many types of adhesives, the key functions are products that withstands wind, temperature, vibration and other challenges the application might face.
Product performance
The choice of construction adhesives and sealants will largely come down to the application. Here are the factors to look for:
Sealants in construction
Sealants are necessary on every new construction job and many restoration applications, such as:
- Deck coatings.
- Expansion joint replacement.
- Crack repair.
- Window replacement.
Structural sealants act as a support for glass, ceramic, metal and composite panels.
Adhesives in construction
Adhesives excel in confined, unexposed areas. In these spaces, both traditional and newer construction materials need products that promote adhesion and performance, while remaining easy to apply. Suited for concrete, wood, plastic and more.
Other examples of adhesives in commercial construction include:
- Subflooring tapes are common in glass, glazing and metal panel applications.
- Concrete and masonry – structural walls, facades and retaining walls.
- Transportation industry (polyurethane).
- Weatherstripping (butyl).
Function meets application
What is the right way to talk about construction adhesives and sealants?
For commercial applications, the simple answer is that an adhesive bonds surfaces structurally, while a sealant makes joints and gaps weatherproof. Some adhesives and sealants are better suited for extreme conditions.
When in doubt, consulting with the manufacturer’s technical expert for proper use and application is advised. Most offer a service to clients to specify a fit-for-purpose product for specific projects.
Issue: What is the difference between adhesives and sealants?
Solution: Each product has specific benefits for different applications and should be carefully specified.
Full acknowledgement and thanks go to https://garvinproducts.com for the information in this article. Original material written by Alex Batch.
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