hot melt properties
The most important properties of hot melt adhesives are besides it's adhesion to specific surfaces, are:
Viscosity
this tells about the flow and application of the hotmelt, is it thin as water (non contact jetting), or thick like syrup (roller or extrusion).
Open time
The open time tells about the time one has after the hot application of the hot melt and the time the application has before you apply the second substrate.
#a PSA hotmelt, used to coat plastic foils to make a self adhesive tape, have a permanent open time
Setting time
is an indication for how long substrates have to be held together with force, before the product can be further processed
Deep Freeze resistancy
Hot melt adhesives can reduce in strenght in cold circumstances, like deepfreeze. Often deep freeze resistancy have a relation with the flexibility of the hot melt adhesive
Heat resistancy
Hot melt adhesives become more soft when they become more hot, even far below the "melting point" hot melt adhesive may give a bond failure in a typical application