1. Color
Due to the different colors of the adherends, the color requirements for hot melt adhesives should be different. If the adherend itself has no special requirements for color, it is recommended to use yellow hot melt adhesive. Generally speaking, yellow hot melt adhesive has better adhesion than white hot melt adhesive.
2. Surface treatment of the adherend
Hot melt adhesives are not as strict as other adhesives in surface treatment of the adherends, but the dust and oil on the surface of the adherends should also be properly treated so that the hot melt adhesive can better play its bonding role.
Operation time. Fast operation is a major feature of hot melt adhesives. The operation time of hot melt adhesives is generally about 15 seconds. With the widespread application of modern production methods-assembly lines, the operation time of hot melt adhesives is required to be shorter and shorter.
3. Temperature resistance
Hot melt adhesives are sensitive to temperature. When the temperature reaches a certain level, the hot melt adhesive begins to soften; below a certain temperature, the hot melt adhesive will become brittle, so the selection of hot melt adhesives must fully consider the changes in ambient temperature.
4. Viscosity
The viscosity of hot melt adhesives is divided into early viscosity and late viscosity. Only when the early viscosity and the later viscosity are consistent can the hot melt adhesive and the adherend remain stable. In the production process of hot melt adhesive, it should be ensured that it has anti-oxidation, anti-halogen, acid and alkali resistance and plasticization.
