Cast and blown stretch film start from the same resin but take genuinely different manufacturing paths — and that path is why they perform so differently on a pallet.
Cast film
Molten resin is cast onto a chilled roller, which cools and solidifies it almost instantly. This fast, controlled cooling is what gives cast film its signature traits:
- High clarity, glossy surface
- Quiet unwind — no crackling sound during application, easier on warehouse floors
- Consistent, predictable stretch behaviour
- Generally the more cost-effective option for standard use
Cast film is the default recommendation for most warehouse machine-wrap applications — see the Stretch Film Micron Guide.
Blown film
Molten resin is extruded and inflated into a bubble, then cooled by ambient air as it rises. This slower, less uniform cooling process produces a film with a different molecular structure:
- Higher puncture and tear resistance
- Better performance on irregular, sharp-edged, or mixed-SKU loads
- Slightly hazier appearance than cast film
- Typically a longer lead time, since blown film production runs are less common than cast
Blown film is the upgrade path when load geometry is the concern rather than cost — see Stretch Film for Irregular Loads.
Which one do you need?
| Factor | Cast | Blown |
|---|---|---|
| Clarity | High | Moderate |
| Puncture resistance | Standard | Higher |
| Noise during application | Quiet | Slightly louder |
| Best for | Standard, uniform pallets | Irregular, sharp, heavy loads |
| Typical lead time | Standard | Often longer |
Not sure which film type your load needs? Talk to PackGPT with a description of your typical pallet.