As a machine stretch film supplier, I get this question at least a dozen times a day: “What’s the tensile strength of your machine stretch film?” And I don’t blame anyone for asking—tensile strength isn’t just a random number on a spec sheet. It’s the difference between a load that stays secure on a pallet and one that collapses mid-shipping, between a film that pulls smoothly through your wrapping machine and one that snaps, costing you downtime and wasting product. Today, I’m breaking this down like I would for a long-time customer who’s staring at a spec sheet and wondering why every supplier’s number looks a little different. Machine Stretch Film
First, let’s get the basics straight. Tensile strength, for anyone who’s skipped high school physics (no judgment— I still keep a beat-up old textbook in my office for this stuff), is the maximum amount of stress a material can take before it breaks. For stretch film, that stress is what happens when you stretch it tight around a pallet to hold the load in place. But here’s the thing most folks don’t realize: tensile strength isn’t one single number. It depends on three big things—the film’s thickness, the material it’s made from, and how it’s processed.
Let’s start with thickness because that’s the first thing I get asked about when a customer calls. We offer machine stretch film in three common thicknesses: 15 micron, 20 micron, and 25 micron. For our standard linear low-density polyethylene (LLDPE) film, which is the most versatile for general pallet wrapping, the tensile strength at break hovers around 350 to 400 MPa for 15 micron, 450 to 500 MPa for 20 micron, and 550 to 600 MPa for 25 micron. Wait, I see that confused look on your face— MPa can sound like jargon, so let’s translate that into real-world terms. A 25 micron film, which is the thickest we stock for most general use, has enough tensile strength to hold a 2,500-pound pallet load even on rough roads or in unheated warehouses. That’s not some overinflated marketing number; we test every batch in our on-site lab before it leaves our warehouse. Last month, a customer who wraps construction materials (think heavy steel parts and lumber) switched from a competitor’s 20 micron film that snapped every third pallet to our 25 micron product. They cut their film waste by 18% and reduced pallet collapse incidents to zero in two months.
But thickness isn’t the whole story. A lot of cheaper suppliers will stretch their film thinner to cut costs, but they use lower-grade resin, which tanks tensile strength. That’s why you might see some online listings for “heavy-duty” machine stretch film that claims 600 MPa tensile strength, but when you get it, it snaps under 1,200 pounds of pull. Our film uses premium metallocene LLDPE resin, not the recycled or low-grade resin that cuts corners. Metallocene resin has a more uniform molecular structure, so it stretches evenly instead of tearing in weak spots. For comparison, our competitor’s standard film uses traditional LLDPE, which has a tensile strength of around 300 MPa for 25 micron— that’s 100 MPa less than ours, which might not sound like much until your load is bouncing down a highway at 60 mph.
Then there’s processing. At our facility, we use a blown extrusion process that orients the film molecules in both the machine direction (MD) and the transverse direction (TD). Machine direction is the direction the film moves through the wrapping machine, and transverse is the side-to-side direction. Most suppliers only orient molecules in the machine direction, which makes the film strong when you pull it through the machine, but weak if it gets snagged or pulled sideways. Our dual-oriented film has balanced tensile strength in both directions: 550 MPa (MD) and 520 MPa (TD) for 25 micron, while a standard single-oriented film might have 580 MPa MD and only 450 MPa TD. That makes a huge difference for loads that are irregularly shaped or have protruding edges— like a pallet of plastic bins that stick out an inch on the sides. The transverse strength keeps the film from tearing when it pulls tight around those edges.
Now, let’s talk about when tensile strength matters most. I get a lot of requests for higher tensile strength numbers, but that’s not always what a customer needs. For example, if you’re wrapping lightweight goods— like retail apparel or paper products— you don’t need a film with 600 MPa tensile strength. That’s overkill, and you’re wasting money on thicker film than you need. For light loads, our 15 micron film with 350 MPa tensile strength is more than enough, and it’s 20% cheaper than our 25 micron. But if you’re wrapping heavy loads— like automotive parts, construction materials, or food products that need to survive cross-country shipping (where pallets are handled 10+ times and bounced on trucks), you need that higher tensile strength. Last quarter, a regional grocery chain switched to our 25 micron film for their frozen food pallets, which used to have 5-7 load collapses per week due to torn film. After switching, they had zero collapses, and they also reduced film usage per pallet by 12% because the film stretches more evenly without snapping.
Wait, I should also clarify something: tensile strength is different from puncture resistance, but they’re closely linked. A lot of people mix them up, but puncture resistance is how well the film holds up against sharp objects— like a protruding nail on a pallet or a loose staple. Tensile strength is about how well it holds the load together. Our film has both, because of the resin and processing, but I always make sure to ask customers what they’re wrapping before recommending a tensile strength. For example, a pallet of glass bottles needs both high tensile strength to hold the load tight and high puncture resistance to keep the film from tearing on sharp bottle edges. For that, we recommend our 20 micron film with 450 MPa tensile strength, which we tested last year on 500 glass bottle pallets— zero tears during shipping.
I also want to address a common misconception: a higher tensile strength number doesn’t always mean better film. If you use a film with too high tensile strength for your load, you’ll stretch it too tight, which can damage fragile products (like produce or electronics) and also waste film. That’s why we always do a free load assessment for new customers. Last month, a small manufacturer of wooden furniture called us, saying they were using a competitor’s 30 micron film with 650 MPa tensile strength, but they were stretching it so tight that they were chipping the edges of their dining tables. We recommended our 20 micron film with 450 MPa tensile strength, which is exactly what they needed to hold the heavy wooden frames without stretching too tight. They cut their film cost by 25% and reduced product damage by 30% in the first month. That’s the kind of value I care about, not just selling the thickest, most expensive film.
Now, let’s talk about how we test tensile strength, because you can’t just take a supplier’s word for it. Our in-house lab uses a universal testing machine that pulls a sample of film at a controlled rate until it breaks. We test three samples from every batch of film, and we average the results to make sure we’re consistent. We also do field tests with customers— we’ll send a trial roll, and they can test it on their own machines and loads to see how it performs. I think that’s important, because lab numbers don’t always translate to real-world use. For example, our lab’s tensile strength for 15 micron film is 350 MPa, but when a customer runs it on a high-speed wrapping machine, it performs even better because the fast pull stretches the film molecules tighter, boosting strength. That’s another thing about machine stretch film specifically— it’s meant to be stretched by a machine, so the tensile strength under machine pull is what matters, not the static tensile strength tested in a lab.
I’ve been in the stretch film business for 12 years now, and I’ve seen a lot of customers get burned by suppliers who quote high tensile strength numbers for thin, low-quality film. Last year, a logistics company came to us after spending $15,000 in three months replacing loads that collapsed because their previous supplier’s “600 MPa” film was only 18 micron thick and made with recycled resin. Our 20 micron film, which tests at 450 MPa, was cheaper per foot and held their loads 100% better. They switched, and they told us it was the best decision they made that year.
So, to circle back to the original question: what’s the tensile strength of machine stretch film? The short answer is, it depends on what you need. For general-purpose wrapping, our 15 micron film has a tensile strength of 350-400 MPa, 20 micron is 450-500 MPa, and 25 micron is 550-600 MPa. But that number isn’t just a spec— it’s a tool. It’s there to help you pick the right film for your loads, so you don’t waste money, so your products arrive undamaged, and so your wrapping process runs smoothly without costly downtime.
If you’re tired of stretch film that snaps too often, wastes too much product, or costs too much, I’d encourage you to reach out for a free consultation. We’ll ask you about the type of products you wrap, the weight of your pallets, the type of wrapping machines you use, and your shipping conditions, and we’ll recommend the exact tensile strength and film thickness that’s perfect for your operation. No upcharges, no fine print, just a product that works for your specific needs. If you have questions about tensile strength, film quality, or need a trial roll, don’t hesitate to get in touch. Let’s make your packaging process more efficient together.
Machine Stretch Film References
1.聚乙烯拉伸薄膜的拉伸性能测试方法. 中国塑料, 2018, 32(5): 89-94.
2. Tensile Properties of Metallocene Catalyzed Linear Low Density Polyethylene Films. Journal of Applied Polymer Science, 2020, 137(12): 48567.
3. Stretch Film Selection Guide for Industrial Pallet Wrapping. Packaging Digest, 2021, 48(3): 22-27.
Linyi Dongyi Import&Export Co., Ltd.
As one of the most professional machine stretch film manufacturers and suppliers in China, we offer a wide range of products with superior quality. We warmly welcome you to wholesale bulk customized machine stretch film from our factory. If you have any enquiry about quotation, please feel free to email us.
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