Hot melt adhesive product selection

The color requirements for hot melt adhesives should vary. If the substrate itself has no specific color requirements, yellow hot melt adhesive is recommended. Generally, yellow hot melt adhesive has better adhesion than white.

Substrate Surface Preparation. Hot melt adhesives are not as demanding on substrate surface preparation as other adhesives, but dust and oil on the substrate surface should still be properly removed to ensure better adhesion.

Working Time. Fast working time is a major characteristic of hot melt adhesives. The working time for hot melt adhesives is generally around 15 seconds. With the widespread use of modern production methods-assembly lines-the required working time for hot melt adhesives is becoming increasingly shorter. For example, bookbinding and speaker manufacturing require a working time of around 5 seconds.

Temperature Resistance. Hot melt adhesives are relatively sensitive to temperature. At a certain temperature, hot melt adhesive begins to soften; below a certain temperature, it becomes brittle. Therefore, the temperature variation of the product's environment must be fully considered when selecting a hot melt adhesive.

Tackiness. Hot melt adhesive tackiness is divided into early tackiness and late tackiness. Only when the early and late tack properties are consistent can the hot melt adhesive maintain stability with the substrate. During the production process of hot melt adhesives, it is essential to ensure they possess resistance to oxidation, halogens, acids and alkalis, and plasticizing properties. The tack properties of hot melt adhesives vary depending on the substrate material; therefore, different hot melt adhesives should be selected based on the specific material being bonded.