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What is Pressure Sensitive Adhesive (PSA)?

Adhesive produce strong adhesion by applying pressure only. It does not require water, solvents, or heat for activation.

Proper Usage of Pressure Sensitive Adhesive (PSA)
  • The surface must be clean and dry.
  • Alcohol, ethyl acetate (EAC), or isopropyl alcohol (IPA) may be used.
  • Apply sufficient contact pressure.
  • Residence Time.
  • Operating temperature should be above 15°C.
What Is Transfer Tape and Where Is It Used?
It is a tape without any carrier and backing material, consisting only of an adhesive layer, easy to bonding or partial bonding with various materials.
What Is Mesh Adhesive Tape and Where Is It Used?
This tape can be made with or without a base material, and the surface of the adhesive surface has a mesh-like structure. The purpose of this design is exhausting air, such as when large-area lamination is involved. It is conducive to the discharge of air bubbles and a smooth appearance during operation. Different mesh designs can be used to achieve different effects. For example, the adhesiveness of a large mesh design will be better than that of a small mesh design (for example, if the surface material is rough or has low tension), a diamond mesh will be more conducive to exhaust than a square mesh, and a dotted design is suitable for repeatable tear-off applications (such as advertising stickers).
Differences and Selection of Silicone, Acrylic, and PU Adhesive Protective Films
  • Silicone adhesive provides excellent adhesion and is suitable for screen protection, film lamination processes, and cleanroom applications. However, silicone carries a risk of silicone residue, so it is not recommended for applications involving touch panels or electrical conductivity.
  • PU adhesive may be considered as an alternative, offering strong adhesion without silicone transfer risk and producing no adhesive debris during die-cutting. However, PU adhesive has poor heat resistance and weather resistance and is not recommended for applications with high temperature or humidity requirements.
  • Acrylic adhesive is suitable for general applications, including screen protection and process lamination. It provides balanced performance with flexible formulation options and is a cost-effective, widely used choice.
Differences and Selection Between PI and PET
  • PI is a high-end film with inherent flame retardancy, high temperature resistance, excellent chemical resistance, and superior insulation properties. It is suitable for high-temperature processes or critical component applications such as battery module insulation, FPC protection, and high-temperature masking.
  • PET offers lower performance than PI but maintains balanced properties that meet most insulation needs in electronic products. It is a cost-effective solution with versatile combinations.
Differences Between High and Low Molecular Pressure Sensitive Adhesives
  • Molecular weight refers to the length of polymer chains in an adhesive. Longer chains provide stronger cohesion and are classified as high molecular weight, while shorter chains provide weaker cohesion and are classified as low molecular weight.
  • High molecular weight PSAs exhibit strong cohesion, excellent heat resistance, shear resistance, and holding power, making them suitable for long-term bonding.
  • Low molecular weight PSAs have lower cohesion but high initial tack and good conformability, making them suitable for rough or low surface energy substrates.

Rigid vs. Soft Adhesives

Rigid Adhesive: Soft Adhesive:
Lower initial tack Very good initial tack
Excellent holding power Lower holding power
Why does cause Adhesive failure or Bond failure？

Adhesive failure is usually not caused by a single factor but by a combination of material, process, environment, and design. Initial checks should focus on the material itself:

• Surface energy not match – prevents proper wetting (e.g., PP, PE, PTFE, silicone rubber)
• Surface contamination – such as release agents, oil, or dust leads to poor adhesion.
• Plasticizer migration – plasticizers migrate to the surface over time due to temperature or environmental factors (e.g., PVC, soft rubber)
• Adhesive–substrate incompatibility – e.g., acrylic PSA not suitable for certain rubber or silicone materials