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Industrial Adhesives – Fundamentals And Best Practices


Sometimes referred to as “glue,” an adhesive is a substance used to join two surfaces and generally has a sticky texture. Structural adhesives are formulated to improve manufacturing processes and end products for a variety of metal, plastic, and composite assemblies. To learn more about how adhesives work, the benefits of structural adhesives, types of structural adhesives (acrylic, epoxy, and urethane), and best practices for applying and testing structural adhesives, read the sections below.

Basics of Adhesion

As the term implies, adhesives work through the adhesion process. There are two important factors in understanding the basics of membership:

Wetting: – the ability of an adhesive to maintain intimate contact with the surfaces to be joined. Adhesives rely heavily on good wetting for maximum adhesion. In the figure to the right, substance “A” has virtually no wetting (very poor or no), substance “B” has low wetting (poor adhesion) and substance “C” has high wetting (strong accession).

Paste Method:

Chemical – The adhesive and the substrate form chemical bonds:

Mechanical – The adhesive fills imperfections (voids, pores, scratches, etc.) on the surface of the substrate:

Adsorption or Diffusion: – The adhesive diffuses keen on the substrate at the molecular level :

Key Advantages of Structural Adhesives

There are many advantages that structural adhesives offer over other fastening methods. Mainly, structural adhesives offer processing suitability and total assembly cost savings. In addition, structural adhesives:

They are easy to use

Require minimal surface preparation

It does not require the drilling of through holes, tapping operations and other costs that are built into typical mechanically fixed gaskets.

They are highly aesthetic

No visible fasteners, substrate deformation, etc.

They are cost effective due to reduced material costs, part count, labor costs and process time

They are available in a wide variety of presentations and dispensing options

Cartridge (piece) – packed for manual dispensing

Bulk containers (gallons, pails, drums) – for high volume applications using measuring / mixing / dosing (MMD) equipment

Design freedom is another advantage of adhesives. Adhesives from chemical manufacturer malaysia allow easy bonding of complicated shapes and can bond dissimilar substrates (dissimilar metals or metals to composites or thermoplastics).

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