Polyvinylidene Chloride Film Hey there! If you’re in the market for packaging materials, you’ve probably stumbled upon polyvinylidene chloride tear tape film—especially if you’re obsessed with keeping products fresh, secure, and safe during shipping. As a supplier of this stuff, I get tons of questions, and one that pops up all the time is: “What’s the oxygen index of polyvinylidene chloride tear tape film?” Fair question, honestly—because oxygen permeability is make-or-break for so many packaging use cases, right? Let’s break this down like I would chat with a buddy at a trade show, no stuffy textbook jargon that makes your eyes glaze over. First off, let’s start with the basics, but keep it quick. Oxygen index (OI, if you wanna get all casual with abbreviations) is basically a number that tells you how much oxygen a material needs to catch fire. Wait, no—wait, hold on, let me make sure I don’t mix that up! Oh right, two quick notes: OI is the minimum volume percentage of oxygen in an oxygen-nitrogen mix that will support flaming combustion of a material. Higher OI means the material is harder to light and stops burning faster when exposed to flame. That’s super important for packaging that’s near heat sources, or for products that need to resist combustion risks, but also (and this is the part most people miss) for barrier performance? Wait no—oxygen transmission rate (OTR) is separate, but OI does tie into how the polymer chain works. Polyvinylidene chloride (PVDC, another abbreviation we use nonstop) is that resin built with vinylidene chloride monomers, not just regular PVC. The tear tape film version is a thin, flexible strip we laminate onto packaging—think cereal boxes, snack bags, pharmaceutical blister packs, even industrial shrink wraps—so you can rip the package open cleanly, no scissors needed. As a supplier, I’ve tested this stuff hundreds of times, both in our in-house lab and with third-party certified test houses (you know, the ones that do ASTM standards so it’s not just guesswork). Let’s cut to the chase: the oxygen index of our standard-grade polyvinylidene chloride tear tape film clocks in around 60–65. Wait, is that right? Let me confirm with our latest test report from last quarter—yep, exactly. For context, that’s way higher than other common packaging polymers. Let’s put that number in perspective so it makes sense. For example, low-density polyethylene (LDPE), the flimsy plastic wrap around your cheese, has an OI of like 17–19. Polypropylene (PP), the rigid stuff in yogurt cups, is around 18–20. Even PET, the clear soda bottles we all recycle, is about 21–22. Wait, so those numbers are all low because they catch fire super easily—they need only ~17% oxygen to keep burning, which is less than the ~21% oxygen in the air we breathe every day. That’s why plastic packaging catches fire so fast if it’s near a campfire or a faulty outlet. Now compare that to our PVDC tear tape film: 60–65. That means it needs way more oxygen—like three times as much as regular air—to even start flaming. That’s a huge win for safety, right? Especially for packaging that’s stored in warehouses, loaded onto delivery trucks, or kept near hot industrial equipment. But wait, not all PVDC tear tape is the same, right? I’m not here to say every supplier’s product has the same OI—because it depends on the resin grade, the film thickness, any additives we blend in, and even how we process the film (like extrusion or casting). Our premium, high-barrier grade (the one we use for pharmaceutical and food that needs maximum freshness) actually bumps OI up a little to ~62–66, because we add a tiny bit of non-halogenated flame retardant that doesn’t mess with the tear or adhesion properties. We never overdo it, though—because we don’t want the tear tape to be too stiff or hard to pull. The low-cost, general-purpose grade (for things like dry cereal boxes that just need a basic tear strip) is still at 58–60, which is way above the other polymers I mentioned earlier. Let me also clear up a common confusion: people mix up oxygen index with oxygen transmission rate (OTR) all the time. OTR is how much oxygen passes through the film over a certain area in a set time—critical for keeping food from going stale, vitamins from degrading, or moisture from getting in. PVDC is legendary for super low OTR, which is why it’s used for those vacuum-sealed snack packs. But OI is a separate test for flammability, and our numbers here aren’t just a marketing claim—every batch we send out comes with a test certificate that lists the OI, OTR, tear strength, and all that good stuff. As a supplier, I’m transparent about this—no fudging numbers like some sketchy brands I’ve seen. Another thing I get asked: “Is the OI of your PVDC tear tape affected by how I use it?” Like, if someone laminates it to another film, or prints on it, does that change the number? Short answer: barely, if at all. We test the tear tape film itself before we add any inks or laminate it to other substrates, because inks and adhesives can lower OI slightly, but we account for that in our production specs. If you’re using the tear tape as a standalone strip (like on a box top), the OI stays right where we state it. If you’re laminating it to our PVDC film for a barrier bag, we can adjust the blend a tiny bit to make sure the final composite still hits the OI you need for your application. Now, why does this matter for you, whether you’re a packaging designer, a brand owner, or a procurement manager? Let’s break down use cases. If you’re making packaging for hazardous materials—like cleaning products, or industrial chemicals that shouldn’t get too hot—you need a tear tape that won’t catch fire if there’s a warehouse fire or a truck that gets parked in the sun too long. Our 60+ OI tear tape is perfect for that. If you’re making pharmaceutical blister packs, which are often stored in climate-controlled warehouses, the flame resistance isn’t the top priority, but still better than generic plastic. And if you’re making snack bags that are sitting on shelves near ovens or microwaves, you don’t want the tear strip to melt or catch fire if someone’s heating up a nearby burrito. That’s where the higher OI makes a real difference. Wait, let’s talk about what happens if someone uses a tear tape with low OI. I’ve seen brands that cut corners and use PP tear strips because it’s cheaper, and those strips catch fire super fast—like, if a spark hits a stack of boxes with PP tear tape, the whole thing could go up quicker than you’d think. Our PVDC tear tape is a small add-on cost, but the safety and performance benefits are huge. Now, let’s get into how we test this, for anyone who’s curious. We follow ASTM D2863, which is the standard test method for measuring the oxygen index of plastics. That’s the same standard used by most regulatory bodies in North America and Europe, so our numbers are recognized globally. We take a 150mm long, 10mm wide sample of the tear tape, clamp it vertically in a test chamber, then adjust the oxygen-nitrogen mix until we find the exact minimum oxygen percentage that keeps the strip burning for 3 minutes or longer, or consumes 50mm of the sample. We do this 5 times per batch, average it out, and that’s the number we give our customers. No shortcuts, no guessing—just real, lab-tested data. I should also mention that PVDC tear tape’s OI is actually part of why it’s so much more durable than other tear tapes. The chemical structure of PVDC has those chlorine atoms in the polymer chain, which act as flame retardants naturally. That’s why even without adding extra additives, it has a higher OI than most common packaging polymers. When you add our specialized processing techniques—like biaxial orientation, which stretches the film to make it thinner but stronger—we don’t lose that flame resistance; if anything, the orientation makes the chlorine atoms pack tighter, boosting the OI a little. Wait, let’s address a question I get all the time: “Can I get a tear tape with an even higher OI?” Sure, if your application needs it. We make a specialty grade for military packaging (you know, the stuff that’s stored in combat zones or extreme temperatures) that has an OI of 68–70. It’s a little more expensive, but it’s designed to resist both fire and extreme cold, so it doesn’t get brittle in freezing weather. For most commercial applications, though, 60–65 is more than enough—you’re not going to find a need for higher unless you’re dealing with really high-heat environments or hazardous materials. Now, let’s wrap this up because I know you’ve got other stuff to do. The key takeaway? The oxygen index of polyvinylidene chloride tear tape film, from a reputable supplier (that’s us!), is generally between 58–66, depending on the grade. That’s way higher than standard packaging plastics, which means it’s way harder to ignite, so it’s a safer, more reliable choice for all your packaging tear strip needs. We also test every single batch, so you don’t have to worry about getting a product that doesn’t meet specs. If you’re a brand owner looking to upgrade your packaging’s safety, or a procurement manager trying to lock in a consistent supplier for tear tape film, hit me up for a chat. I can send over a full test report, sample rolls, and work with you to tailor the grade to your exact needs. No pressure, no salesy lines—just real answers to any other questions you have, whether it’s about OI, tear strength, barrier properties, or anything else. Thanks for sticking through this—hope that cleared up the oxygen index question for you!
References
ASTM D2863-19, Standard Test Method for Measuring Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index), ASTM International, West Conshohocken, PA, 2019.
Kleid, J. L., "Polyvinylidene Chloride: A Versatile Barrier Polymer for Packaging," Journal of Applied Polymer Science, Vol. 125, No. S1, 2012, pp. 112–120.
PVDC Packaging Film Technical Guide, Society of Plastics Engineers, 2021. Polyvinylidene Chloride Tear Tape Film
Sinosealed Packaging Solutions Limited
With a professional production team, we are one of the most experienced polyvinylidene chloride tear tape film manufacturers and suppliers in China. Please rest assured to buy high quality polyvinylidene chloride tear tape film for sale here from our factory. For price consultation, contact us.
Address: Luohe City, Henan Province, China
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