Why Polyisobutylene (PIB) is essential in Cling Films: performance & migration

06.08.2025

2 minutes

Are you looking for a smarter way to make your cling films stronger, cleaner, and more efficient? Discover why manufacturers across packaging, construction, and transportation industries rely on one key ingredient: low molecular weight polyisobutylene (PIB 30).
Choosing the wrong tackifier can lead to poor adhesion, visible residue, or uncontrolled migration. But there’s a proven solution that tackles all of these challenges at the source.

What makes PIB so effective in LLDPE Cling Films?

PIB isn’t just another additive. This polymer plays a critical role in
enhancing the tack, flexibility, and visual quality of LLDPE-based stretch and cling films; the industry standard for pallet wrapping, masking, and protective applications.
PIB 30 (molecular weight ~1300 g/mol) is specially designed to migrate to the film surface within 48 hours, creating a tacky layer that bonds effectively without bleeding or staining. The result? Strong, stable cling performance with a clean, professional finish.

Cling forces continue to increase over time, reaching their peak around 2 weeks when stored at room temperature (~20 °C). This makes PIB ideal for applications where predictable adhesion is essential.

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Balanced performance & controlled migration

Property	Benefit with PIB 30
Tack (adhesion)	Strong, long-lasting cling effect
Migration behavior	Predictable surface migration within 48 hours
Thermal behavior	Consistent performance across temperature variations
Compatibility	Designed for LLDPE (blown or cast film)

Low molecular weight PIB delivers a unique balance of tack and migration that’s difficult to replicate with other additives. Because PIB is immiscible with polyethylene, it naturally diffuses toward the surface. This mechanism enables auto-adhesion between film layers, critical for unitizing, wrapping, or protecting goods under mechanical stress.

Why leading stretch film producers trust PIB

Global film producers rely on PIB 30 because it offers:

Stable cling properties regardless of climate or handling conditions
Efficient processing on standard LLDPE extrusion lines
Non-staining, non-toxic, and compatible with food-safe production (where applicable)
Added gloss and improved gas barrier properties

Whether you’re producing mono or co-extruded films, PIB 30 delivers consistent results. Even when exposed to heat, pressure, or prolonged storage.

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Applications where you don’t want to miss out

If you’re operating in an environment where film performance is critical, PIB gives you the confidence to deliver, without compromise.

PIB 30 is the preferred tackifier for:

Packaging & logistics: stretch wrap, palletizing, bundling
Construction: temporary surface protection, vapor barriers
Automotive & transport: masking films, component protection
Industrial coatings: cover films for dust or moisture-sensitive surfaces

In each of these use cases, PIB helps your films perform predictably, cling securely, and protect with confidence.

Your next step

Ready to enhance your cling film performance with a proven, efficient additive? Request a PIB 30 sample today or contact our technical team for tailored formulation advice.