The benefits of abrasion don’t stop at simply removing contamination. A rough surface for bonding often leads to stronger bonds for several reasons:
Roughness, especially excessive roughness, may not always be a benefit, however. In order to bond to a rough surface, it is necessary for the adhesive to flow into the cracks and crevices created by abrasion. This is true for both liquid adhesives and tapes. Tapes DO flow! If the adhesive is not capable of flowing, there is less overall contact between adhesive and surface, and trapped air may result in reduced strength or bonds poorly protected from environmental exposure.
Very thin tapes often require very smooth surfaces in order to create a bond. Imagine how much gap a 0.002" thick tape is capable of spanning without filling, thereby trapping air.
While not capable of flowing into very small cracks and crevices, high viscosity liquids are the most gap-filling products, capable of spanning gaps over 0.25". This is important when bonding very rough materials, such as unfinished fiberglass composite.
Low viscosity liquids are the most capable of flowing into all the cracks and crevices of a surface. While not the best at “gap filling” like high viscosity fluids, their ability to fully wet out surfaces allows them to bond some very difficult-to-bond materials, such as cyanoacrylates bonding rubbers.
Expand your design capabilities by bonding dissimilar materials with ease. Explore new ways to join materials and discover how 3M adhesive technology assists you in your designs.
Thank you for your interest in 3M Industrial Adhesives & Tapes products. A 3M representative will contact you shortly regarding your inquiry.
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