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Adhesive Advancements and Performance Improvements to Meet the Most Demanding Applications and Newest Manufacturing Materials

Posted on 1/27/2021 9:32:00 AM By Fastener and Fixing
  

Meeting demands from industry to industry for more, newer, and increasingly efficient adhesive applications capable of bonding a wider range of substrates and the changing needs of cutting-edge manufacturers has increased the variety and broadened the spectrum of general and custom-developed adhesives. The industry continues to evolve to be the leading solutions provider to manufacturers and end users.

Adhesives once comprised mainly of epoxy resins and cyanoacrylates, are now based on a wide range of different materials, with varied characteristics and applications, as more doors open to new industries with differing requirements. Included are those industries that previously made use of fasteners like bolts and screws and are now using adhesive bonding that is often automated, because of efficiency and versatility which allows for gap filling, better stress distribution and less stringent component tolerance. Adhesives can also adopt the joined parts’ properties, compensate for the stress that can arise when joining two different substrates, minimize or prevent crevice corrosion, and even act as a sealant when they have gel-like viscosity.

Different Performance Requirements

Adhesives are now designed to meet different performance requirements like after-curing resistance to fluctuations in temperature, humidity, vibration and shock, which can often be met by modified levels of viscosity, color or hardness. In other instances evaluating alternative base chemistries can assist in finding the right adhesive for particular  requirements such as ensuring no movement is caused by shrinkage during curing, and high hardness. In this instance epoxies is a better choice than acrylates, while picking both these adhesives would be the right choice when flexibility and low stress are required for fragile connections.

Thermal and Electrical Conductivity

Some industrial adhesives are also now thermally or electrically conductive. They provide conductivity while bonding components, either operating separately or using the two types of conductivity together. Electrically conductive adhesives are able to successfully replace soldered joins with more flexible ones, and create a conductive path that’s corrosion free. They are well-suited to heat sensitive components in the assembly of micro electronics.

Thermally conductive adhesives are synthetic resins augmented with fillers, and are often used to dissipate heat from power electronics, and to reduce thermal strain when bonding heat sinks to prevent the performance loss of electronic component failure.