Pressure-Sensitive Adhesives: Crosslinked or Not?

Pressure-sensitive adhesives (PSAs) fall into two main groups based on their structure: crosslinked and non-crosslinked. This difference shapes how well they stick and where they work best. Let’s break it down.

Crosslinked vs. Non-Crosslinked PSAs

• Crosslinked PSAs: Their molecules form a net-like structure, making them super strong. They link up in three ways:

  • At room temperature (no extra heat).

  • With heat (heated to set the bond).

  • With light (like UV rays to lock molecules).
    This strength makes them ideal for permanent labels—stickers that need to stay put forever.

• Non-Crosslinked PSAs: Their molecules don’t form that tight net. They’re simpler, often used for temporary jobs like removable stickers.

[Image Suggestion 1: A side-by-side diagram. Left: “Crosslinked” with a net-like molecular structure and a permanent label icon. Right: “Non-Crosslinked” with a loose molecular structure and a removable sticker icon.]

Hot-Melt PSAs: A Smart New Choice

Factories needing faster production and a focus on less pollution have made hot-melt PSAs a hit.

Compared to older types (solvent-based or water-based), hot-melt PSAs:

• Are easy to use—just melt and apply.

• Create no pollution (no harmful solvents).

• Spread evenly, speeding up coating.

They’re now a top pick to replace old PSAs, with demand growing fast.

[Image Suggestion 2: A workflow showing hot-melt PSA production: melting the adhesive → applying it smoothly → a finished label. Highlight “No Pollution” and “Fast Coating” with checkmarks.]

Crosslinked PSAs bring strength, non-crosslinked ones offer flexibility, and hot-melt types? They’re quick, clean, and taking over markets—proving good things come in simple packages.