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).
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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