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Pressure-activated adhesive (also known as pressure-sensitive adhesive, PSA) is an adhesive that bonds immediately upon contact with a surface when light pressure is applied—without the need for heat, solvents, or water. Window film with pressure-activated adhesive allows for repositioning on the glass before it fully adheres.
Pressure-sensitive adhesive is made from a combination of:
Elastomers (rubber-like polymers)
Resins (for bonding strength)
Sometimes plasticisers (for flexibility)
When you press the adhesive against a surface, two things happen:
Wet adhesion – The adhesive flows slightly and makes contact with microscopic surface irregularities (adhesion).
Internal cohesion – The adhesive has enough internal strength (cohesion) to hold itself together after bonding.
It means that:
It only needs light pressure to bond.
It bonds instantly without drying time.
It can, in some cases, be removed and reused (e.g., Post-it notes).
It depends on both surface energy and contact pressure.
Window film
Labels and stickers
Medical bandages