The thickness of stretch film, also known as its gauge, is a critical factor determining its strength, durability, and suitability for specific applications. It is measured in microns (µm) or gauge, and occasionally in mils.
Here is a detailed breakdown of stretch film thicknesses, their common names, and typical uses:
1. Measurement Units and Conversion
Microns (µm): The most precise and internationally recognized metric unit. 1 micron = 1 micrometer = 0.001 mm.
Gauge: A common imperial unit used in the packaging industry. 100 Gauge = 1 Mil = 25.4 Microns.
Mil: Primarily used in the United States. 1 Mil = 0.001 inches = 25.4 Microns.
Quick Conversion Table:
| Microns (µm) | Gauge | Mil (inches) |
|---|---|---|
| 10 µm | 40 Ga | 0.4 Mil |
| 15 µm | 60 Ga | 0.6 Mil |
| 17 µm | 67 Ga | 0.67 Mil |
| 20 µm | 80 Ga | 0.8 Mil |
| 23 µm | 90 Ga | 0.9 Mil |
| 25 µm | 100 Ga | 1.0 Mil |
| 30 µm | 120 Ga | 1.2 Mil |
2. Thickness Categories and Applications
Stretch film thickness can be categorized by its intended use and performance level. The following chart illustrates these categories and their typical gauge ranges:
Explanations of each category:
Light-Duty / Economy Grade (12 - 17 µm / 47 - 67 Gauge)
Characteristics: Thin, cost-effective, low puncture resistance.
Applications: Ideal for lightweight, stable, and uniform loads. Perfect for bundling lightweight boxes, securing items in storage, and short-distance transportation of goods under 400 kg.
Usage: Primarily hand-applied.
Standard-Duty / General Purpose (17 - 23 µm / 67 - 90 Gauge)
Characteristics: The most versatile and widely used grade. Offers a good balance of strength, stretch, and cost.
Applications: Suitable for medium-weight pallets (400-800 kg) with relatively regular shapes. Common in warehouses and distribution centers for standard logistics.
Usage: Both hand and machine application.
Heavy-Duty / High Performance (23 - 30 µm / 90 - 120 Gauge)
Characteristics: Excellent puncture and tear resistance. Often made with advanced resins (like C8 or mLLDPE) or using the blown film process.
Applications: Designed for heavy loads (800-1200 kg), sharp-edged items (metal, machinery, construction materials), and unstable pallets. Used for long-distance or high-risk transportation.
Usage: Often machine-applied, but heavier hand films also exist.
Extra Heavy-Duty / Specialty Grade (30+ µm / 120+ Gauge)
Characteristics: Maximum strength and durability. May be reinforced or be a specialty film like VCI (for metal corrosion protection) or UV-resistant for extended outdoor storage.
Applications: Extremely heavy loads (1500kg+), highly sharp or abrasive products, and harsh environmental conditions.
Usage: Typically machine-applied.
3. How to Choose the Right Thickness?
Selecting the correct gauge depends on several factors:
Load Weight: Heavier loads require thicker, stronger film.
Load Stability: Irregular, unstable, or tall loads need the superior holding force of a thicker film.
Product Type: Sharp or abrasive edges (e.g., metal, machinery) demand high puncture resistance (heavier gauge).
Transportation Conditions: Long-distance or intermodal shipping often requires a more durable film to withstand handling stresses.
Wrapping Method:
Hand Stretch Film: Typically ranges from 15µm to 23µm. Thicker films are harder for operators to stretch manually.
Machine Stretch Film: Typically ranges from 17µm to 30+µm. Machines can handle the force needed to stretch thicker films and benefit from their superior strength for high-volume operations.
General Rule of Thumb: Using the thinnest possible film that safely secures your load is the most cost-effective and sustainable approach. However, never compromise load safety for cost savings. A film that is too thin can lead to product damage, which is far more expensive than the film itself.
Summary
In summary, stretch film thickness is not one-size-fits-all. It ranges from as thin as 10µm for ultra-light bundling to over 30µm for the most demanding industrial applications. Understanding your load's requirements and matching them to the appropriate thickness category is essential for ensuring shipment safety, optimizing costs, and maximizing efficiency.
