{"id":3591,"date":"2026-10-14T11:27:35","date_gmt":"2026-10-14T03:27:35","guid":{"rendered":"http:\/\/www.intacthair.com\/blog\/?p=3591"},"modified":"2026-10-14T11:27:35","modified_gmt":"2026-10-14T03:27:35","slug":"what-materials-are-used-to-make-pom-push-in-fitting-4a60-736829","status":"publish","type":"post","link":"http:\/\/www.intacthair.com\/blog\/2026\/10\/14\/what-materials-are-used-to-make-pom-push-in-fitting-4a60-736829\/","title":{"rendered":"What materials are used to make POM Push in Fitting?"},"content":{"rendered":"

If you\u2019ve ever worked with pneumatic systems, plumbing, or even small DIY projects that need quick connections, you\u2019ve probably seen a POM push-in fitting. As someone who\u2019s been supplying these little workhorses for years, I get a lot of questions from new clients and hobbyists alike: \u201cWhat exactly are these made of, and why does it matter?\u201d I\u2019m not here to give you a stuffy engineering lecture\u2014just the real, no-BS breakdown of the materials that go into every fitting we ship, why we pick them, and how they hold up when you\u2019re relying on them. POM Push in Fitting<\/a><\/p>\n

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First off, let\u2019s clear up the big one: POM. That\u2019s short for Polyoxymethylene, sometimes called acetal or polyacetal. I know, it sounds like a chemical tongue-twister, but it\u2019s the backbone of 90% of the push-in fittings we sell. Why? Because it\u2019s tough, lightweight, and weirdly good at holding small, tight parts in place\u2014perfect for that push-and-click mechanism that makes these fittings so easy to use. Not all POM is the same, though. I\u2019ve sourced cheap, low-grade POM from overseas before, and let me tell you, it cracks in cold weather or swells up when it touches certain oils. Now we only use food-grade, virgin POM for our main fittings, and it makes a world of difference. Virgin means we\u2019re not melting down old plastic parts to make new ones\u2014no weird impurities that could mess with pressure or durability.<\/p>\n

Wait, let\u2019s get into the why of POM specifically. Push-in fittings need to do two main things: grip the tube you\u2019re pushing in, and hold up against whatever fluid or gas is running through the line. Virgin POM has a super low coefficient of friction, right? That means you can push the tube in smoothly (no fighting it, no stripping threads), but once it\u2019s in, the internal teeth catch hard. No slipping, no leaks. It\u2019s also heat-resistant enough for most general use\u2014stands up to temps from like -40\u00b0F to 175\u00b0F, which covers everything from workshop pneumatic tools to small plumbing lines in a home. And let\u2019s be real, it\u2019s way cheaper than metal fittings, so it\u2019s perfect for bulk orders, which is most of what our clients need.<\/p>\n

But POM alone isn\u2019t enough. There\u2019s another key part you can\u2019t see: the sealing ring. That\u2019s the tiny O-ring sitting inside the fitting, right where the tube connects. If that\u2019s trash, no matter how good the POM housing is, you\u2019ll have leaks. We use EPDM O-rings 9 times out of 10, for good reason. EPDM is short for Ethylene Propylene Diene Monomer, and it\u2019s durable, flexible, and resistant to most common fluids\u2014water, air, mild chemicals, even some glycols. It doesn\u2019t harden up in cold weather or get all goopy and weak in warm, humid spots, which is why it\u2019s such a go-to for general fittings.<\/p>\n

Wait, but EPDM isn\u2019t for every job. If a client is working with something harsher\u2014like industrial-grade oils, strong solvents, or compressed air that\u2019s been super dried out and heated\u2014we\u2019ll switch to FKM O-rings. FKM, also called Viton for the brand name, is way more chemical-resistant than EPDM. It\u2019s not as cheap, so we only use it when it\u2019s needed, but it\u2019s a game-changer for heavy-duty or specialized applications. I once had a client in a food processing plant that was using EPDM O-rings that broke down when they introduced a new sanitizing chemical. Switched to FKM, and they haven\u2019t had a leak since. That\u2019s the kind of real-world stuff you don\u2019t learn from a datasheet.<\/p>\n

Then there\u2019s the gripper ring\u2014you know, that little plastic (or sometimes metal) claw inside the fitting that bites into the tube to keep it from pulling out. Wait, no, that\u2019s not POM either, usually. A lot of standard fittings use PA66 for the gripper. PA66 is Polyamide 66, basically nylon, and it\u2019s rigid enough to hold that sharp, tooth-like shape, but still flexible enough to expand a little when you push the tube in, then snap back to grip. It\u2019s also resistant to abrasion, so it doesn\u2019t wear out even if you\u2019re pulling tubes in and out a hundred times. For high-pressure applications, we\u2019ll sometimes use stainless steel grippers instead of nylon\u2014way stronger, no risk of the plastic wearing down over time. That\u2019s for clients running lines with 150+ PSI, not the 100 PSI for a air compressor hobbyist.<\/p>\n

Wait, what about the other parts? The outer sleeve, the small push tab you press to release the tube? Those are almost always POM too, same virgin grade as the housing. We make sure the push tab is thick enough that you don\u2019t snap it off when you\u2019re trying to disconnect a tube in a tight spot. I\u2019ve had clients tell me they tried cheaper fittings where the push tab breaks after one use\u2014total headache, especially if you\u2019re working on a machine that\u2019s bolted to a wall and you can\u2019t get a grip to reach the tab. Our tabs are tested to withstand thousands of presses, no cracking.<\/p>\n

Let\u2019s talk about what we never use, because that\u2019s just as important. We used to test recycled POM a few years back, but it had inconsistent melting points, so when we injected it into molds, some parts came out thin and weak, others lumpy and warped. Not good for a fitting that\u2019s supposed to hold pressure. And we never use standard rubber for O-rings\u2014silicone might sound good, but it swells up when it touches mineral oil, which is super common in pneumatic systems. Nylon grippers are a no-go for high-heat jobs, because they start to soften above 180\u00b0F. We\u2019ve seen that with cheap imports, and it leads to tubes slipping out mid-operation\u2014ask any HVAC tech how annoying that is, or a factory line worker whose machine shut down because of a leak.<\/p>\n

Now, let\u2019s get into why material choice matters for you, the buyer. If you\u2019re a hobbyist working on a home airbrush or a fish tank airline, you don\u2019t need FKM O-rings or stainless steel grippers\u2014standard virgin POM, EPDM, and PA66 is perfect, and it\u2019s affordable. But if you\u2019re a factory running a production line with hydraulic fluid, or someone working in a cold storage unit where temps drop below freezing, you need to spec the right materials to avoid downtime. We don\u2019t push a one-size-fits-all approach, which is why we ask clients about their application, the fluid\/gas they\u2019re moving, the pressure, and the temperature before we even recommend a fitting. That\u2019s why a lot of our repeat clients rely on us\u2014we don\u2019t just sell parts, we help them pick the right ones.<\/p>\n

I also want to mention testing, because it\u2019s not just about what we use, it\u2019s about how we make sure it works. Every batch of our POM fittings goes through pressure testing\u2014we run them at 150% of their rated PSI for 10 minutes, no leaks, no cracks. We test the O-rings for chemical resistance by soaking them in the fluid a client is using for 72 hours, checking for swelling or hardening. The grippers get pull-tested, to make sure they won\u2019t let go even if someone yanks the tube hard by accident. That\u2019s the stuff that doesn\u2019t show up in product photos, but it\u2019s why our fittings don\u2019t fail when you need them.<\/p>\n

<\/p>\n

A few common misconceptions I hear all the time: \u201cMetal fittings are always better.\u201d Yeah, maybe, but they\u2019re heavier, more expensive, and you can\u2019t bend the line as easily because the fitting is bulky. POM fittings are lightweight, so you can run more lines without adding extra weight to a machine, and they\u2019re way cheaper for bulk orders. Another one: \u201cAll POM is the same.\u201d No way\u2014some manufacturers cut corners with POM that has additives to make it look shiny, but it\u2019s brittle and breaks easy. We pay a little more for our virgin POM, but that cost gets passed on in reliability, not in constant replacements because parts broke.<\/p>\n

Pipe Fittings and Accessories<\/a> If you\u2019re reading this and you\u2019re in the market for POM push-in fittings, whether it\u2019s a small batch for a DIY project or 10,000 fittings for an industrial line, don\u2019t waste time guessing what materials are in the parts you\u2019re buying. We\u2019re here to answer every question, help you spec the right materials for your specific job, and make sure you get parts that hold up. No hidden costs, no cheap junk that\u2019ll cause you headaches later. If you want to chat about your needs, or get a quote, just reach out and we can go over all the details. No sales pitch, no confusing jargon\u2014just straight talk about fittings that work when you need them.<\/p>\n

References<\/h2>\n
    \n
  1. Polyoxymethylene (POM) Material Properties. DuPont Technical Guide.<\/li>\n
  2. EPDM vs FKM Elastomer Chemical Resistance Charts. Parker Hannifin Industrial Seals.<\/li>\n
  3. Polyamide 66 (PA66) Mechanical Characteristics. BASF Engineering Plastics Data Sheet.<\/li>\n
  4. Pneumatic Fitting Material Standards. ISO 10361:2018.<\/li>\n<\/ol>\n
    \n

    Yuyao Eshiong Pipe Fittings Technologies Co., Ltd.<\/a>
    Yuyao Eshiong Pipe Fittings Technologies Co., Ltd. is one of the most professional pom push in fitting manufacturers and suppliers in China. With abundant experience, we warmly welcome you to wholesale bulk customized pom push in fitting at competitive price from our factory. If you have any enquiry about free sample, please feel free to email us.
    Address: No.263,North Yangshan Village, Lishan, Ditang Subdistrict, Yuyao \uff0cNingbo \uff0cZhejiang
    E-mail: sales@trosung.com
    WebSite:     https:\/\/www.eshiongcn.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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