Pressure-sensitive Vs. Setting
Hot melt adhesives are often divided into two categories:
- pressure sensitive hot melt adhesives (PSA)
- setting hot melt adhesives
Pressure Sensitive Adhesives (PSAs)
PSAs create bonding when pressure is applied to bond two substrates together. As the name shows, the degree of bonding is influenced by the amount of pressure applied. Because the adhesive remains sticky, it has high bonding strength but less cohesive strength. As a result, this adhesive does not create a strong tensile bond, but its tack makes it ideal for applications where the bond needs to be restorable or it must be possible to reposition parts.