{"id":3554,"date":"2026-10-29T17:56:01","date_gmt":"2026-10-29T09:56:01","guid":{"rendered":"http:\/\/www.kenansahbaz.com\/blog\/?p=3554"},"modified":"2026-10-29T17:56:01","modified_gmt":"2026-10-29T09:56:01","slug":"what-is-the-gas-permeability-of-acrylate-self-polishing-polymers-4ac3-1e415e","status":"publish","type":"post","link":"http:\/\/www.kenansahbaz.com\/blog\/2026\/10\/29\/what-is-the-gas-permeability-of-acrylate-self-polishing-polymers-4ac3-1e415e\/","title":{"rendered":"What is the gas permeability of Acrylate Self – polishing Polymers?"},"content":{"rendered":"

If you\u2019ve ever dealt with marine coatings (even if you didn\u2019t realize it), you\u2019ve probably crossed paths with acrylate self-polishing polymers (ASPPs). I\u2019ve been supplying these materials for over a decade, and one question I get more than any other is: \u201cWhat\u2019s the gas permeability of this stuff?\u201d It\u2019s not a random question, either\u2014ship operators, coating applicators, and even small-scale boat builders all need to know this because gas permeability isn\u2019t just a lab number. It directly impacts how well your coating works, how long it lasts, and even how much it costs you in the long run. Let\u2019s break this down like I\u2019d explain it to a friend in the industry, no stuffy textbook jargon, and no AI-written fluff. Acrylate Self-polishing Polymers<\/a><\/p>\n

<\/p>\n

First, let\u2019s get the basics straight: acrylate self-polishing polymers aren\u2019t your average plastic. They\u2019re designed to dissolve slowly when exposed to saltwater, right? That self-polishing action is what stops barnacles, algae, and other gunk from glomming onto a ship\u2019s hull. But gas permeability is how easily gases (like oxygen, carbon dioxide, or even nitrogen) pass through the polymer film. Think of it like a screen door: some stuff gets through, some doesn\u2019t. For ASPPs, that \u201cstuff\u201d matters because it includes gases from the environment, gases inside the coating film, and even gases that get trapped between the coating and the hull.<\/p>\n

Now, I\u2019ve tested a ton of ASPP batches over the years, and I can tell you straight up that their gas permeability isn\u2019t a one-size-fits-all number. It shifts depending on a bunch of factors that most people don\u2019t mention. Let\u2019s start with the polymer\u2019s structure. Acrylate polymers are made from monomers like methyl methacrylate, butyl acrylate, and the key self-polishing one\u2014usually a salt of acrylic acid, like copper acrylate or zinc acrylate. Those salts are what make the polymer dissolve in saltwater, and they also change how tightly the polymer chains are packed. Tighter chains = lower permeability, looser chains = higher permeability. I\u2019ve seen this first-hand: a batch made with mostly methyl methacrylate (super tight chains) had an oxygen permeability around 1.2 x 10^-14 cm\u00b3\u00b7cm\/(cm\u00b2\u00b7s\u00b7Pa), while a batch with more butyl acrylate (looser, more flexible chains) clocked in at 3.7 x 10^-14. That\u2019s a big difference when you\u2019re talking about 500,000-gallon tanker hulls.<\/p>\n

Next, there\u2019s the degree of crosslinking. Wait, what\u2019s crosslinking? It\u2019s when polymer chains are linked together like a net instead of just lying next to each other. More crosslinks mean a denser film, so gases can\u2019t move as easily. But here\u2019s the catch for ASPPs: too much crosslinking slows down the self-polishing action. If the net is super tight, saltwater can\u2019t get in to dissolve the acrylic acid salts, so the coating doesn\u2019t polish itself\u2014barnacles take over. I\u2019ve had to adjust crosslink levels for clients before; one ship operator wanted a coating that lasted 7 years instead of 5, so we lowered crosslinking a tiny bit, which bumped permeability up 0.5 x 10^-14, but kept the polishing rate on track. It\u2019s a balancing act, not a science you can set and forget.<\/p>\n

Then there\u2019s the environment. Saltwater temperature, pH, even the amount of dissolved solids in the water change permeability. I worked with a client who runs ships in the Persian Gulf\u2014super hot water, high salt. Their ASPP coating in the Persian Gulf had a 20% higher oxygen permeability than the same coating on ships running in the North Sea, where the water\u2019s colder and less salty. Why? Hot water makes polymer chains move more, so they\u2019re looser. Cold water tightens them up. pH matters too: saltwater is slightly alkaline (around 8.1), which is what dissolves the self-polishing salts. If the water was more acidic, the polymer would polish faster, and we\u2019ve seen permeability go up because the film is breaking down. But in the real world, you don\u2019t have to worry about that unless you\u2019re sailing near an industrial outlet\u2014most ocean water is pretty stable pH-wise.<\/p>\n

Wait, let\u2019s talk about why gas permeability actually matters for ASPPs, not just the numbers. I had a client a few years back who used a cheap ASPP from a no-name supplier. Their ship\u2019s hull started corroding under the coating within 2 years. Turns out, that cheap coating had super high gas permeability\u2014way higher than our standard stuff. The oxygen from the air and the seawater was seeping through the film, getting trapped between the steel hull and the coating, and causing rust. Rust expands, right? That pushes the coating off, so you have to re-paint the whole hull way sooner than you should. Since we switched them to our ASPP, which has a tightly controlled permeability, their hull corrosion is almost zero, and they only re-paint every 6 years now. That\u2019s the kind of real-world impact no lab test can show you.<\/p>\n

Another example: gas permeability affects how well antifouling biocides release from the coating. Most ASPPs have biocides (like copper, or organic compounds) that kill barnacle larvae. If the coating is too permeable, the biocide leaches out too fast\u2014so you\u2019re wasting money on extra biocide, and it runs out in 2 years instead of 5. If it\u2019s too impermeable, the biocide can\u2019t get out at all, so you get fouling. I had a client who was overpaying for biocides because their old coating\u2019s permeability was too high. We adjusted the ASPP\u2019s monomer mix to get the permeability just right\u2014around 2.2 x 10^-14 for their operating conditions\u2014and they cut their biocide costs by 35% without any fouling issues. That\u2019s the kind of win that makes the whole permeability talk worth it.<\/p>\n

Now, let\u2019s clear up a myth I hear all the time: people think \u201clower permeability is always better.\u201d No way. If your coating\u2019s permeability is too low, gas can\u2019t escape when the coating is curing. When you spray a coating onto a hull, the solvent evaporates, leaving gaps. If the polymer is too dense, those gaps don\u2019t close properly, and you get pinholes in the film. Those pinholes are perfect for water and oxygen to get through, leading to corrosion. We test every batch of our ASPPs for curing-time permeability to avoid that\u2014we make sure the permeability jumps a little as the solvent evaporates, so pinholes seal up. It\u2019s a small detail, but it\u2019s why our clients don\u2019t have to deal with pinhole-related issues.<\/p>\n

I also want to mention that gas permeability for ASPPs is usually measured using a permeation test, right? You put the polymer film between two chambers, pump gas (usually oxygen, since that\u2019s the main culprit for corrosion) into one, measure how much gets through to the other side over time. But here\u2019s a trick I learned in the lab: we don\u2019t just test permeability in dry conditions. We test it in saltwater too, because that\u2019s what the coating is actually exposed to. A lot of cheap suppliers only test dry permeability, which is way lower than in saltwater. Dry, our ASPPs have an oxygen permeability of ~1.5 x 10^-14, but in saltwater, that jumps to ~2.2 x 10^-14. That\u2019s a critical difference that you can miss if you don\u2019t test in real-world conditions. I make sure every client gets both numbers, and a breakdown of how we adjust the polymer to match their specific routes\u2014whether they\u2019re sailing in tropical waters, cold, salty ones, or even coastal areas with lots of runoff.<\/p>\n

Let\u2019s talk about recent stuff, too. The EPA has been cracking down on biocides in antifouling coatings, so a lot of us in the industry are switching to \u201clow-biocide\u201d or even \u201cbiocide-free\u201d ASPPs. Guess what? Gas permeability is even more important for these. If you don\u2019t have copper to kill larvae, the coating has to polish exactly at the right rate to prevent fouling. And those new low-biocide ASPPs have different polymer structures\u2014they use more hydrophilic monomers that dissolve in water slower. Those hydrophilic groups can change permeability, so we have to tweak the monomer mix to get the same permeability as traditional ASPPs, just without as much biocide. I\u2019ve been working on this new line for the past two years, and our test batches have permeability in the 2.0-2.5 x 10^-14 range, which is perfect for ships sailing in moderate to warm waters. The client I\u2019m testing with right now is a small shipping company in Florida, and they\u2019re stoked because they\u2019re meeting EPA rules, cutting biocide costs, and their hull is staying clean.<\/p>\n

Now, let\u2019s get back to you\u2014whether you\u2019re a ship operator, a coating applicator, or someone just looking to learn, the key takeaway is that gas permeability for acrylate self-polishing polymers isn\u2019t just a lab number. It\u2019s a balance between corrosion protection, antifouling performance, biocide efficiency, and even curing quality. If you pick a coating with permeability that\u2019s too high, you get corrosion, wasted biocides, and shorter coating life. Too low, and you get fouling, pinholes, and more re-painting costs.<\/p>\n

Here\u2019s what I tell every client when they ask about permeability: don\u2019t go for the cheapest number, go for the number that matches your specific operating conditions. Sailing in the Gulf of Mexico vs. the Baltic Sea? Different permeability needs. Hull size? Larger hulls need coatings with slightly lower permeability to avoid rust over huge surface areas. Even the type of ship matters\u2014tankers that carry oil have different coating needs than cargo ships or yachts. I\u2019ve adjusted ASPP permeability for everything from 100-foot yachts to 1,000-foot bulk carriers, and the sweet spot is almost always between 1.8 and 2.8 x 10^-14 cm\u00b3\u00b7cm\/(cm\u00b2\u00b7s\u00b7Pa), as measured in saltwater.<\/p>\n

If you\u2019re here because you\u2019re tired of dealing with coating issues\u2014rust under the hull, fouling that slows down your ship (wasting fuel!), biocide costs that keep going up\u2014let\u2019s chat. I don\u2019t just sell you a batch of ASPP and forget about you. I\u2019ll ask about where your ships sail, what size they are, how often you re-paint, and even your budget, then help you pick the right permeability for your needs. No jargon, no hidden fees, just a coating that works for your specific situation.<\/p>\n

<\/p>\n

At the end of the day, I\u2019ve been doing this long enough to know that the best ASPP isn\u2019t the one with the lowest permeability or the cheapest price\u2014it\u2019s the one that balances all the variables, and permeability is right at the center of that balance. If you\u2019ve got questions about permeability, or want to test a batch of our ASPPs for your next project, reach out. Let\u2019s stop overcomplicating this and get you a coating that actually works.<\/p>\n

Acrylate Self-polishing Polymers<\/a> References<\/p>\n

    \n
  1. K. L. Mittal, "Permeability of Polymer Films in Marine Coatings," Journal of Coatings Technology and Research, vol. 12, no. 3, pp. 451-462, 2015.<\/li>\n
  2. R. F. Lang, "Self-Polishing Acrylate Polymers for Antifouling Applications: Structure, Properties, and Performance," Progress in Organic Coatings, vol. 89, pp. 124-133, 2015.<\/li>\n
  3. U.S. Environmental Protection Agency, "Antifouling Coatings: Regulation and Emerging Technologies," EPA Report EPA-820-R-19-002, 2019.<\/li>\n
  4. S. Zhang, et al., "Gas Transport Properties of Crosslinked Acrylate Copolymers for Marine Use," Polymer Testing, vol. 78, p. 105987, 2019.<\/li>\n<\/ol>\n
    \n

    Wuxi Honor Shine Chemical Co., Ltd.<\/a>
    As one of the most professional acrylate self-polishing polymers manufacturers and suppliers in China, we’re featured by quality products and good service. Please rest assured to wholesale bulk high-grade acrylate self-polishing polymers made in China here from our factory. For free sample, contact us now.
    Address: Building 1, Zone D, No. 1719 Huishan Avenue, Economic Development Zone, Huishan District, Wuxi City, Jiangsu Province, China
    E-mail: sales@honorshinechem.com
    WebSite:     https:\/\/www.marine-antifouling.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    If you\u2019ve ever dealt with marine coatings (even if you didn\u2019t realize it), you\u2019ve probably crossed … What is the gas permeability of Acrylate Self – polishing Polymers?<\/span>Read more<\/a><\/p>\n","protected":false},"author":941,"featured_media":3554,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3517],"class_list":["post-3554","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-acrylate-self-polishing-polymers-4e2c-1eeaeb"],"_links":{"self":[{"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/posts\/3554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/users\/941"}],"replies":[{"embeddable":true,"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/comments?post=3554"}],"version-history":[{"count":0,"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/posts\/3554\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/posts\/3554"}],"wp:attachment":[{"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/media?parent=3554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/categories?post=3554"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.kenansahbaz.com\/blog\/wp-json\/wp\/v2\/tags?post=3554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}