When anticipating using adhesives in structural bonding, a common need is developing the testing protocol to demonstrate bonded system effectiveness. While pressure-sensitive tapes are used in structural joining, this discussion will focus on liquid, paste, and film adhesives in structural joints.
Formulators are constantly updating their adhesive and sealant formulations; consequently, manufacturers of the equipment used to measure the adhesives’ and sealants’ flow behavior properties must keep current with these new formulations.
Most people in the adhesives and sealants industry are aware of viscosity and realize that it characterizes the way a material will flow. More technically speaking, viscosity refers to a material's resistance to flow; it can be measured in various ways, depending on the application.