Adhesives, also known as binders or bonding agents, are substances with chemical properties that can firmly connect two or more adhesive materials that have undergone surface treatment, and possess a certain degree of mechanical strength. Examples include epoxy resin, copper phosphate - monoxide, white latex, etc.
Materials that Adhesives Can Bond

1. Metal
   After the oxide film on the metal surface is treated, it is easy to be bonded. However, due to the large difference in the linear expansion coefficients of the two phases when the adhesive bonds the metal, internal stress is likely to occur in the adhesive layer. In addition, the bonded parts of the metal are prone to electrochemical corrosion due to the action of water.
2. Rubber
   The greater the polarity of the rubber, the better the bonding effect. Among them, nitrile - butadiene rubber and neoprene have large polarities and high bonding strengths; natural rubber, silicone rubber, and butyl rubber have small polarities and relatively weak adhesion. In addition, there are often release agents or other free auxiliaries on the rubber surface, which hinder the bonding effect.
3. Wood
   Wood is a porous material that is easy to absorb moisture, causing dimensional changes, which may lead to stress concentration. In addition, polished wood has better bonding performance than rough - surfaced wood.
4. Plastic
   Plastics with large polarities have good bonding properties.
5. Glass
   From a microscopic perspective, the glass surface consists of countless uneven concave and convex parts. Use adhesives with good wettability to prevent the presence of air bubbles in the concave and convex parts, which may affect the bonding. In addition, glass has a main structure of Si - O - and its surface layer is easy to adsorb water. Due to the strong polarity of glass, polar adhesives are easy to form hydrogen bonds with the surface, resulting in firm bonding. Glass is brittle and transparent, so these factors need to be considered when choosing an adhesive.

PP material is a non - polar material with a low surface energy. During the gluing process on the surface of PP material, problems such as poor adhesion between the substrate and the glue and debonding are likely to occur. Tutuonline tells you an effective solution, which is to conduct effective pre - treatment on the surface of the PP material. In addition to basic cleaning, applying a PP treatment agent between the substrate and the glue can enhance the adhesion and solve the debonding problem.
High temperature resistant adhesive-Products-Silicone Adhesive