{"id":487,"date":"2026-09-29T01:04:31","date_gmt":"2026-09-28T17:04:31","guid":{"rendered":"http:\/\/www.codewithcode.com\/blog\/?p=487"},"modified":"2026-09-29T01:04:31","modified_gmt":"2026-09-28T17:04:31","slug":"what-is-the-shrinkage-rate-of-barrier-shrink-bags-4c71-f13c0a","status":"publish","type":"post","link":"http:\/\/www.codewithcode.com\/blog\/2026\/09\/29\/what-is-the-shrinkage-rate-of-barrier-shrink-bags-4c71-f13c0a\/","title":{"rendered":"What is the shrinkage rate of Barrier Shrink Bags?"},"content":{"rendered":"

If you\u2019ve ever ordered something online that came crinkled in tight, stretchy plastic, or helped your grocery guy wrap a 20-pack of bottled water in that clear, taut film, you\u2019ve probably come across barrier shrink bags. I\u2019m the owner of a shrink film supply company, and 9 out of 10 times when a client hits me up asking about these bags, the first question isn\u2019t even \u201chow do I use them\u201d \u2014 it\u2019s \u201cwhat\u2019s the shrinkage rate anyway?\u201d Like, yeah, I get it. If you\u2019re ordering these for pallets, retail packaging, or industrial parts, guessing at shrinkage is a fast track to disaster. Too little shrink and your load sags, tears, or gets loose enough to slide off a forklift. Too much shrink and you\u2019re warping a custom wooden crate, melting labels, or wasting half your film on over-tightening. Barrier Shrink Bag<\/a><\/p>\n

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First, let\u2019s keep this real \u2014 I\u2019m not here to throw around jargon like I\u2019ve got a shrink meter up my sleeve (though I might have one buried in the back of my truck). The shrinkage rate of barrier shrink bags isn\u2019t a random number. It\u2019s measured two ways: the horizontal direction (that\u2019s the width, like if you\u2019re laying a flat bag down and stretching it left to right) and the vertical direction (the length, top to bottom). Most standard barrier bags we supply to clients are what we call \u201cdual-axis shrink\u201d \u2014 that means they shrink in both directions, not just one. If you ever used a kitchen shrink wrap bag for a frozen turkey, that\u2019s single-axis, but barrier bags for industrial or food packaging work differently for a reason.<\/p>\n

Here\u2019s the thing I wish every first-time client knew: shrinkage rate isn\u2019t a one-size-fits-all. I\u2019ve had a craft brewery order 5,000 bags for their 12-packs that complained their bags were \u201ctoo tight,\u201d and two weeks later, a construction parts supplier come back saying their bags were \u201cnot tight enough.\u201d The difference? Their shrink specs. Most standard barrier shrink bags we carry clock in at around 50% horizontal shrink and 30% vertical shrink \u2014 wait, let me make that super clear: 50% of the original width, and 30% of the original length. Let\u2019s use a simple example: if you have a flat bag that\u2019s 20 inches wide and 10 inches long before heating, when you run it through the shrink tunnel, it\u2019ll shrink to about 10 inches wide (20 x 0.5) and 7 inches long (10 x 0.7). That\u2019s the baseline for our stock barrier bags, but that\u2019s not the only number that matters.<\/p>\n

Why do clients care so much about this? Let\u2019s break it down with actual use cases, because that\u2019s what gets real. A food distributor that uses barrier bags to wrap cases of fresh veggies needs just enough shrink to hold the cases together without crushing the produce. A metal parts supplier using these bags to wrap small, irregularly shaped bolts? They need a little extra horizontal shrink to pull tight over nooks and crannies without popping a seam. And an industrial pallet wrapper? They need consistent shrink that stays steady in hot warehouses \u2014 no sagging mid-shipment when the trailer drives across Texas in July.<\/p>\n

I should also call out the most common mistake I see new buyers make: confusing shrink rate with shrink temperature. Like, yeah, if you crank up your shrink tunnel to 250 degrees instead of the standard 180 to 200, you\u2019ll get more shrink \u2014 but you\u2019ll also burn the bag, melt the printed logo, or leave hot spots that make the film weak. That\u2019s why the rated shrink rate of a barrier bag is only valid when you use it at the recommended heat settings. Our stock bags hit that 50\/30 number perfectly at 190 to 210 degrees in a standard shrink tunnel. Crank it up and you might hit 60% horizontal shrink, but you\u2019re asking for holes and wasted product. Too low, and you\u2019re at 35% horizontal shrink, which is useless for anything beyond a light dust cover.<\/p>\n

Wait, also \u2014 there\u2019s a difference between \u201cfree shrink\u201d and \u201capplied shrink.\u201d Free shrink is what the bag does when you heat it with nothing inside \u2014 that\u2019s the 50\/30 number I mentioned earlier. Applied shrink is what it does when it\u2019s pulling tight around a product. For example, if you put a big case of soda into a flat bag, the applied shrink might be a little less than 50% because the case is rigid, so the film can\u2019t stretch all the way. If you\u2019re wrapping a soft, flexible item, you\u2019ll get almost exactly the free shrink number. That\u2019s why we always ask clients to send a quick pic of what they\u2019re wrapping before we suggest a bag size \u2014 saves everyone the hassle of ordering the wrong thing.<\/p>\n

I\u2019ve had so many clients ask if we have a bag with 100% shrink, and let\u2019s be real \u2014 that\u2019s impossible. Plastic films don\u2019t shrink all the way, and trying to get that would require so much heat you\u2019d melt the bag entirely. 50% is about the max most dual-axis barrier bags hit, unless it\u2019s a specialty bag. Speaking of specialty bags, we also carry high-shrink barrier bags for clients that need that extra tight pull \u2014 like, up to 60% horizontal shrink and 35% vertical. Those are for when you\u2019re wrapping irregular, slippery parts that would shift during shipping, or for retail display where you need that super taut, professional look for shelves. The tradeoff with high-shrink bags is that they\u2019re a little thicker and a bit more expensive, but for that use case? Worth every penny.<\/p>\n

Let\u2019s talk about what affects shrink rate, too, because it\u2019s not just the bag itself. First, bag thickness. You can get barrier shrink bags in 30 gauge, 40 gauge, 50 gauge, even up to 80 gauge for heavy industrial use. Thicker bags tend to have slightly lower shrink rates, because the plastic is stiffer and takes more heat to pull tight. A 30 gauge bag will hit that 50% horizontal shrink easier than an 80 gauge bag, which might only get to 40%. Second, the type of resin we use. We work with two main resin blends for barrier bags: one is a linear low-density polyethylene (LLDPE) blend that\u2019s great for general use, and a high-clarity EVOH blend for food packaging that needs better oxygen barrier. The EVOH blend has a tiny bit lower shrink rate \u2014 around 45% horizontal \u2014 because the EVOH layer adds a little rigidity to the film. That\u2019s a tradeoff for better food safety, not a flaw, so we always make sure clients know that upfront. Third, storage conditions. If you leave barrier bags sitting in a hot warehouse for six months before using them, the plastic starts to \u201crelax\u201d \u2014 it loses some of its stretch potential, so shrink rate drops by 5 to 10%. Always store these bags in a cool, dry place, and use them within 6 months of receiving them for the best results.<\/p>\n

I remember a client a few months back who ordered 10,000 40 gauge barrier bags, ran them through his shrink tunnel at 170 degrees, and swore they were \u201conly shrinking 20% and useless.\u201d When he called me complaining, I asked a few questions: did you calibrate your shrink tunnel last month? Are you using the right conveyor speed? Turns out he\u2019d let his technician skip the quarterly calibration, and his tunnel was running 25 degrees too cool, plus he was moving the pallets through twice as fast as he should. We had him adjust the temp to 200 degrees and slow the conveyor, and boom \u2014 his shrink rate jumped right up to the 50% he needed. That\u2019s another big one: your equipment matters as much as the bag itself. A cheap shrink gun for small batches won\u2019t give you the same consistent shrink as a commercial shrink tunnel, just like a residential oven won\u2019t match an industrial heat source for pallet loads.<\/p>\n

Now, let\u2019s get to the part that matters most if you\u2019re reading this and thinking \u201cI need to order these for my business.\u201d How do you measure the shrinkage rate of a barrier bag yourself, if you want to test it before ordering a full batch? It\u2019s super simple, no fancy lab equipment needed. Grab a sample bag, lay it flat, measure the width (let\u2019s say it\u2019s 20 inches) and the length (10 inches). Mark those numbers down. Then, put a small test object that\u2019s a little smaller than the bag inside (like a rolled-up towel or a cardboard box), seal the bag, heat it evenly with a heat gun or small tunnel until it\u2019s fully shrunk, then measure the new width and length. Do the math: ((Original Width – New Width) \/ Original Width) x 100 = horizontal shrink rate. Same for length. That test will tell you exactly what rate you\u2019re getting, way better than any generic number online.<\/p>\n

At the end of the day, the shrinkage rate of barrier shrink bags isn\u2019t some secret number only suppliers know. It\u2019s a spec that\u2019s tailored to what you\u2019re using the bags for. Our goal as a supplier isn\u2019t just to sell you a box of bags \u2014 it\u2019s to make sure those bags actually work for your product, no wasted money, no headaches when your shipment arrives. If you\u2019re not sure what shrink rate you need, or if you\u2019ve had bad luck with shrink bags in the past, hit me up to chat. We can send free samples, walk you through measuring your current shrink rate, and even adjust our bag specs to fit your exact use case, whether you\u2019re wrapping 10 cases of craft beer or 100 pallets of industrial parts.<\/p>\n

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Don\u2019t overcomplicate this. Shrinkage rate matters, but it\u2019s just one piece of the puzzle. Pair the right rate with the right bag thickness, the right heat, and the right equipment, and your products will stay secure, look professional, and arrive exactly how you intended. If you\u2019re ready to get started, reach out to us to talk through your needs.<\/p>\n

Coextruded Film<\/a> References:<\/p>\n

    \n
  1. Shrink Film and Barrier Packaging Association. (2021). Standard Test Methods for Shrinkage of Polyethylene and Multi-Layer Barrier Films.<\/li>\n
  2. American Society for Testing and Materials. (2018). ASTM D2732: Standard Test Method for Shrinkage of Plastic Film and Sheeting.<\/li>\n
  3. Food and Drug Administration. (2020). Guidelines for Barrier Packaging Used in Food Transportation and Storage.<\/li>\n<\/ol>\n
    \n

    Sinosealed Packaging Solutions Limited<\/a>
    With a professional production team, we are one of the most experienced barrier shrink bag manufacturers and suppliers in China. Please rest assured to buy high quality barrier shrink bag for sale here from our factory. For price consultation, contact us.
    Address: Luohe City, Henan Province, China
    E-mail: contact@barrierpackage.com
    WebSite:     https:\/\/www.barrierpackage.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    If you\u2019ve ever ordered something online that came crinkled in tight, stretchy plastic, or helped your … What is the shrinkage rate of Barrier Shrink Bags?<\/span>Read more<\/a><\/p>\n","protected":false},"author":67,"featured_media":487,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[447],"class_list":["post-487","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-barrier-shrink-bag-44c8-f17943"],"_links":{"self":[{"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/posts\/487","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/users\/67"}],"replies":[{"embeddable":true,"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/comments?post=487"}],"version-history":[{"count":0,"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/posts\/487\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/posts\/487"}],"wp:attachment":[{"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/media?parent=487"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/categories?post=487"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.codewithcode.com\/blog\/wp-json\/wp\/v2\/tags?post=487"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}