Melting Point (Ring & Ball method) of hot melt adhesives
The melting point of a hot melt is the temperature at which the hot melt liquefies. Typically, the melting point is determined in the laboratory. by the Ring and Ball method.
Ring and Ball method.
A cooled hotmelt adhesive film is placed in a steel ring. A bullet that fits through the ring is placed on top of this adhesive film. The whole is placed in an oil bath. As soon as the steel ball falls through the hotmeltfilm and touches the bottom is laid down on it the melting point of the hotmelt.