If you’ve ever stopped to watch a pallet of goods being wrapped in machine stretch film glide through a warehouse line, you’ve probably noticed how that thin, unassuming material holds everything together so tightly. As a machine stretch film supplier, I get asked about its performance characteristics all the time, and one of the most common questions I hear is: “What is the tear strength of machine stretch film?” It’s a fair question—tear strength isn’t just a random metric to throw on a spec sheet; it’s the difference between a shipment that arrives intact and one that ends up with broken boxes, damaged goods, and a lot of frustrated warehouse teams. Machine Stretch Film
Let’s start with what tear strength actually means, because a lot of people mix it up with tensile strength. Tensile strength measures how much force a material can take before it stretches and breaks in a straight line, like pulling a piece of film apart lengthwise or crosswise. Tear strength, on the other hand, is about how well the film resists spreading a small hole or nick into a full tear. Think of it like this: if you snag a piece of film on a sharp pallet edge, tensile strength would tell you if the whole thing snaps immediately when you pull, but tear strength tells you if that small snag will turn into a long gash that renders the film useless. For machine stretch film, this is critical because the film is being pulled tight around irregular loads, slid over metal pallet components, and exposed to all kinds of warehouse debris that can cause tiny punctures.
Now, here’s the part I wish more people understood: there’s no single “one-size-fits-all” tear strength for machine stretch film. I’ve seen so many buyers come to me asking for a specific number in PSI (pounds per square inch) or g/μm (grams per micrometer), and while those numbers are helpful, they depend entirely on what the film is going to be used for. Let’s break down the variables that shape tear strength, because that’s where the science meets real-world performance.
First, there’s the type of resin used to make the film. Most machine stretch film these days is made from linear low-density polyethylene (LLDPE), which is different from the old low-density polyethylene (LDPE) films you might remember from years ago. LLDPE has much better tear and puncture resistance, which is why it’s become the standard for industrial wrapping. But even within LLDPE, there are different grades. For example, we use a blend of metallocene LLDPE and traditional LLDPE in most of our standard machine stretch films, and that blend boosts tear strength by about 20% compared to films made from straight traditional LLDPE. Metallocene resins create more uniform molecular chains, so when the film is stretched during application, those chains align more evenly and resist tearing better. If a buyer is wrapping very heavy loads—like 5,000-pound stacks of steel parts—we’ll use a higher percentage of metallocene resin to get a tear strength that can handle the extra force without failing.
Then there’s the film gauge, which is just another word for thickness. Gauge is measured in mils (1 mil = 0.001 inch) or micrometers, and it’s a huge factor in tear strength. A 80-gauge (20-micron) machine stretch film will have a lower tear strength than a 100-gauge (25-micron) film, but that doesn’t mean you should always go thicker. Thicker films cost more, and if you’re wrapping small, light loads like boxes of electronics, the extra thickness is wasted money. We recently had a customer who was using 100-gauge film for their 2,000-pound pallet of bottled water, and they were overspending by 30% because the higher tear strength of the thick film was unnecessary for that load. We switched them to 80-gauge film with a tailored resin blend, and their tear strength was more than enough for their application, cutting their film costs significantly.
Another big factor is how the film is processed and stretched during manufacturing. Machine stretch film is designed to be stretched automatically by equipment, which is why it’s called “machine” film (as opposed to hand stretch film, which is thinner and meant to be pulled by hand). When the film is made, it’s cast or blown into a thin sheet, and then stretched during the extrusion process to align those molecular chains I mentioned earlier. The amount of stretch, called “draw ratio,” directly impacts tear strength. A higher draw ratio means the chains are more aligned, which boosts tensile and tear strength—but only up to a point. If you stretch the film too much during manufacturing, it becomes brittle, and tear strength actually drops because the chains are pulled too tight and can’t flex. We test every batch of our film to make sure we’re hitting that sweet spot: enough stretch to align the chains, but not so much that the film becomes fragile. We had a supplier a few years ago who started cutting corners on draw ratio to make their film cheaper, and their tear strength was so low that customers were having 1 in 20 pallets tear open during shipping. That’s a nightmare for everyone involved, so we’re very careful to control that process step.
Now, let’s talk about real-world numbers, because I know you want to see something concrete. For our standard 80-gauge machine stretch film, the tear strength is roughly 150-180 g/μm in the machine direction (MD) and 120-150 g/μm in the cross direction (CD). Wait, “machine direction” and “cross direction”—that’s another thing I get asked about. MD is the direction the film was pulled through the manufacturing line, so it’s the direction the film will stretch when it’s applied to a pallet. CD is the opposite direction, across the width of the film. That’s why tear strength is slightly lower in the CD—when you’re wrapping a pallet, the film is pulled in the MD, so the tears that happen are more likely to go in the CD. But our blends are calibrated to make the MD and CD tear strength as close as possible, so the film is resistant to tears no matter which direction they start from. For our heavier-duty 120-gauge film, those numbers go up to 210-240 g/μm MD and 180-210 g/μm CD, which is enough to handle loads up to 6,000 pounds in harsh shipping conditions with lots of pallet edge contact.
But here’s the most important point about tear strength: it should be matched to your specific application, not chosen randomly. If you’re wrapping pallets that are going to be stored inside a climate-controlled warehouse and only shipped short distances, a lower tear strength film works fine. But if you’re shipping pallets cross-country, where they’ll be handled by forklifts, slid over rough concrete, and exposed to rain or cold temperatures that make plastic more brittle, you need a higher tear strength. We had a customer in the automotive parts industry a couple of years ago who was shipping engine components across the country in winter. They were using a standard tear strength film, and about 10% of their pallets were arriving with torn film, exposing the parts to dirt and damage. We switched them to our cold-temperature grade machine stretch film, which has a modified resin blend that retains its tear strength even at temperatures as low as -20°F. The tear strength of that film is actually the same as our standard 100-gauge film, but the resin blend makes it flexible in cold weather, so it doesn’t become brittle and tear during application in winter. The customer’s damage rate dropped to less than 1%, and they saved money because they didn’t have to replace damaged parts.
Another common mistake people make is confusing tear strength with puncture resistance. They’re related, but they’re not the same. Puncture resistance is how well the film resists being pierced by a sharp object, like a nail or a piece of broken pallet wood. Tear strength is how well it resists turning that small puncture into a full tear. A film could have high puncture resistance but low tear strength, meaning it might stop a small nail from piercing, but once it’s pierced, it will tear all the way around the pallet. Or it could have low puncture resistance but high tear strength, meaning a small snag will pierce the film, but the tear won’t spread. The best machine stretch film has a balance of both, which is what our products are designed for.
As a supplier, I also test our tear strength in real conditions, not just in a lab. Lab tests are important—we use an Elmendorf tear tester, which is the standard industry tool, to measure tear strength under controlled conditions. But I’ve learned over the years that lab numbers don’t always tell the whole story. For example, we once tested a film that had great Elmendorf tear strength numbers, but when we ran it through a customer’s automated wrapping machine, it kept tearing because the machine’s tension settings were too high. That’s why we work closely with every customer to test our film on their specific equipment and for their specific loads before we make a large order. We’ll send a sample roll, they can run a test pallet, and we adjust the film blend or gauge if needed to make sure it works for their exact setup.
I know there’s a lot to unpack here, and it’s easy to get overwhelmed by all the metrics and variables. The bottom line is that tear strength isn’t just a number on a spec sheet—it’s a critical performance characteristic that protects your shipments, reduces waste, and saves you money in the long run. If you’re shopping for machine stretch film, don’t just ask for a generic “high tear strength” film. Ask about the resin blend, the gauge, the draw ratio, and how the film performs in your specific shipping and storage conditions. The cheapest film might seem like a good deal upfront, but if its tear strength is too low, you’ll end up paying for damaged goods and extra labor to re-wrap pallets.
At the end of the day, our job as a machine stretch film supplier is to help you find the right product for your needs, not just sell you the most expensive or the cheapest. We’ve been refining our blends and testing our processes for years, and our tear strength performance is something we’re proud of because we know it keeps our customers’ shipments safe. If you have questions about your current film’s tear strength, or if you’re looking to switch to a more reliable product, we’re here to help. We can provide sample rolls, answer all your technical questions, and work with you to find a solution that fits your budget and your needs. Don’t hesitate to reach out to discuss your machine stretch film requirements.
Mini Stretch Film References
ASTM D1922: Standard Test Method for Propagation Tear Resistance of Plastic Film and Thin Sheeting by Pendulum Method
The Society of Plastics Engineers (SPE) Stretch Film Division. (2021). Industrial Stretch Wrapping Materials and Applications.
Modern Materials Handling. (2022). Key Performance Metrics for Industrial Stretch Film.
Linyi Dongyi Import&Export Co., Ltd.
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