In this article we explain the key differences between adhesives and sealants, through an exploration of what makes up an adhesive and a sealant.

Permabond Adhesive and Sealant

Overview of Adhesives

Adhesives are substances that are capable of bonding two or more separate substrates together by chemically overcoming the forces required to separate them. They are used in virtually every product that is composed of two or more parts, as they are often more efficient and easier to apply than mechanical fasteners. For more information regarding how adhesives provide advantages over mechanical fasteners, read our article “What Are Structural Adhesives?“.

Overview of Sealants

Sealants are flexible, paste-like substances that block the flow of fluids through a surface, gap or joint by filling all the spaces between two separate substrates. They have traditionally been used for waterproofing processes, although they also have applications in fire-retardants and thermal insulation. Whilst sealants are not the same as adhesives, some do possess adhesives properties. Similarly, many adhesives technologies can be formulated into sealants.

Adhesives and sealants are both commonly available as polyurethanes, methacrylates, epoxies, cyanoacrylates, silicones and silane-modified polymers.

Key Differences Between Adhesives and Sealants

Although adhesives and sealants are often discussed under the same category of material, they do have crucial differences which make them fit for different purposes. A few of these differences are explained below:

Strength

Flexibility

Gap-Filling

pressure sensitive adhesive
Adhesive tapes are an example of pressure sensitive adhesives.

Considerations for Choosing Between Adhesives and Sealants

There are various factors to consider before deciding whether to use an adhesive or a sealant. These factors can be thought of as questions, such as:

Here at Antala, we recommend world-leading adhesive and sealant brands, with decades of proven quality experience, such as: Huntsman Araldite, Dupont, DOWSIL, and Permabond.

sealing

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