Stretch Film Gauges & Types Explained: Cast vs Blown, Micron & Pre-Stretch

Industry Data: Stretch film performance is widely misunderstood as a matter of thickness alone, when in practice the film's type, pre-stretch capacity and resulting containment force determine both load stability and cost — meaning the right specification often uses less film, not more. Source: Stretch film technology and packaging efficiency guidance.

Stretch film is where a lot of packaging money is wasted — usually by buying on thickness alone. But gauge (micron) is only part of the story: cast versus blown manufacture, pre-stretch capacity and cling matter just as much, and the right film often uses less material, not more. Greenstrix (greenstrix.com) manufactures high-elongation LLDPE stretch film, and this guide explains how to choose the right gauge and type for your loads and wrapping method.

1. Gauge (Micron): What It Really Means

Gauge is the film's thickness, measured in microns (µm). Higher micron means a thicker, stronger base film that resists puncture and holds more — so heavier or sharper loads generally need higher gauge. Common gauges range from around 12 µm for light loads to 30 µm and above for heavy or demanding ones.

But gauge alone is misleading. A thinner high-performance film, applied with proper pre-stretch, can hold a load better than a thicker basic film — using less material. So micron is a starting point, not the whole answer. Greenstrix supplies high-performance LLDPE film across gauges so you can often go thinner without losing containment.

2. Cast vs Blown: Two Manufacturing Methods

Stretch film is made two ways. Cast film is produced by casting molten film onto a chill roll: it is clear, quiet to unwind, very consistent, and generally lower cost — ideal for uniform loads and high-clarity needs. Blown film is produced by blown extrusion and cooled by air: it is stronger, has higher cling and puncture resistance and better load retention, but is hazier and noisier to unwind.

The choice is by priority: cast for clarity, quiet, consistency and cost on regular loads; blown for strength, cling and puncture resistance on heavy, sharp or irregular loads. Greenstrix advises the right type for your loads and wrapping method.

3. Pre-Stretch: Where Real Yield Comes From

Pre-stretch is the single biggest lever in stretch film economics. It is the percentage the film is stretched — by a machine or a good hand technique — before it goes onto the load. Film pre-stretched 200–300% covers far more area than the same weight applied with little stretch, so high pre-stretch means dramatically more wrapped pallets per roll.

This is where high-elongation LLDPE film pays off: it tolerates high pre-stretch without breaking, delivering maximum yield and the lowest cost and carbon per pallet. Greenstrix supplies high-elongation LLDPE film engineered for high pre-stretch. See the pre-stretch calibration and pallet-wrapping guides linked below.

• Pre-stretch % — how far film stretches before application.
• High pre-stretch — more area, fewer rolls, lower cost.
• High-elongation film — tolerates high pre-stretch.
• Yield — measured in pallets per roll, not micron.

4. Cling, Containment & Load Stability

Two more properties complete the picture. Cling is the tackiness that holds wraps to each other; it must be the right level and on the correct side (usually inward) to hold without loads sticking together. Containment force is the total holding force the film applies to the load — and it, not thickness, determines whether a load stays stable.

The goal is to reach the target containment force efficiently, which high-performance high-pre-stretch film does with less material. Greenstrix supplies consistent-cling, high-containment LLDPE film. See the pallet-collapse and containment-force guides linked below.

5. Machine vs Hand Film & Choosing Your Spec

Machine and hand film differ: machine film comes on larger rolls engineered for high pre-stretch on automatic and semi-automatic wrappers, while hand film is on shorter, lighter, often narrower rolls for manual wrapping, with cling and gauge suited to hand application.

To choose your spec: set gauge by load weight and sharpness, pick cast or blown by clarity-versus-strength priority, maximise pre-stretch with high-elongation film, and choose machine or hand format by method. Greenstrix supplies both formats across gauges and advises the right specification with samples. See the wholesale film and film-problems guides linked below.

• Machine film — large rolls, high pre-stretch, automated.
• Hand film — short, light rolls for manual wrapping.
• Set gauge by load; type by clarity vs strength.
• Maximise pre-stretch with high-elongation film.

6. People Also Ask

Is cast or blown stretch film better?

Neither universally — cast is better for clarity, quiet unwind, consistency and cost on regular loads; blown is better for strength, cling and puncture resistance on heavy or irregular loads. Greenstrix advises the right type for your application.

How do I reduce stretch film cost?

Use high-elongation film with high pre-stretch to get more wrapped pallets per roll, and don't over-specify gauge — containment force, not thickness, holds the load. Greenstrix supplies high-performance film that often lets you go thinner and cut cost.

What micron stretch film do I need?

It depends on load weight and sharpness — roughly 12–17 µm for light uniform loads, 17–23 µm for medium, and 23–30 µm+ for heavy or sharp loads, though high-performance film can go thinner. Greenstrix advises the right gauge for your loads.

What is containment force in stretch wrapping?

It is the total holding force the film applies to the load, and it — not film thickness — determines load stability. Reaching target containment efficiently with high-performance film is the goal. Greenstrix supplies high-containment LLDPE film.

7. Frequently Asked Questions

Q: What does stretch film gauge (micron) mean?

Gauge is the film's thickness in microns — higher micron means a thicker, stronger base film that resists puncture and holds more, so heavier or sharper loads generally need higher gauge. But micron alone is misleading: a thinner high-performance film with proper pre-stretch can outperform a thicker basic one. Greenstrix supplies high-performance LLDPE film across gauges.

Q: Should I choose cast or blown stretch film?

Cast film is clear, quiet to unwind, consistent and lower cost — ideal for uniform loads and clarity. Blown film is stronger, higher-cling and more puncture-resistant with better retention, but hazier and noisier — ideal for heavy, sharp or irregular loads. Choose by priority. Greenstrix advises the right type for your loads.

Q: Why is pre-stretch so important for stretch film?

Pre-stretch — how far the film is stretched before application — is the biggest lever in film economics. Film pre-stretched 200–300% covers far more area than the same weight applied with little stretch, so high pre-stretch means far more pallets per roll and lower cost and carbon. Greenstrix supplies high-elongation LLDPE film engineered for high pre-stretch.

Q: Does thicker film give more stable loads?

No — containment force, the total holding force the film applies, determines load stability, not thickness. A thinner high-performance film with high pre-stretch can reach higher containment than a thicker basic film. Greenstrix supplies high-containment LLDPE film that delivers target containment efficiently.

Q: What is the difference between machine and hand stretch film?

Machine film comes on larger rolls engineered for high pre-stretch on automatic and semi-automatic wrappers; hand film is on shorter, lighter, often narrower rolls with cling and gauge suited to manual wrapping. Greenstrix supplies both machine and hand LLDPE film across gauges.

Q: How do I choose the right stretch film specification?

Set gauge by load weight and sharpness, choose cast or blown by clarity-versus-strength priority, maximise pre-stretch with high-elongation film, and choose machine or hand format by method. Greenstrix supplies both formats across gauges and advises the right specification with samples and datasheets.

8. Related Guides & Products

• Stretch Film Supplier Europe
• Stretch Film Wholesale Buyer's Guide
• How to Wrap a Pallet Correctly
• Stretch Film Problems Solved
• Stretch Film vs Shrink Film
• How to Choose a Packaging Supplier
• Reduce Packaging Costs Europe 2026
• Why Pallets Collapse in Transit
• Stretch Film
• Shrink Roll
• PP Strapping
• PET Strapping
• Stretch Film — Germany
• Stretch Film — France
• Stretch Film — Italy
• Stretch Film — Poland
• Stretch Film — Netherlands
• Stretch Film — UK
• Logistics Industry
• Warehousing Industry
• Manufacturing Industry
• All Products
• Certifications
• Why Greenstrix
• Contact