{"id":3454,"date":"2026-10-09T02:17:30","date_gmt":"2026-10-08T18:17:30","guid":{"rendered":"http:\/\/www.imeric-valvebags.com\/blog\/?p=3454"},"modified":"2026-10-09T02:17:30","modified_gmt":"2026-10-08T18:17:30","slug":"what-is-the-water-resistance-of-more-o-rings-4487-af3d02","status":"publish","type":"post","link":"http:\/\/www.imeric-valvebags.com\/blog\/2026\/10\/09\/what-is-the-water-resistance-of-more-o-rings-4487-af3d02\/","title":{"rendered":"What is the water resistance of More O Rings?"},"content":{"rendered":"

Hey there, if you\u2019ve ever spent time hunting for O-rings for anything from a backyard pool pump to a scuba regulator, you\u2019ve probably run into \u201cwater resistance\u201d as a top priority\u2014 and if you\u2019re here asking about More O Rings specifically, you\u2019re not alone. I\u2019ve been supplying these little workhorses for over 8 years, and I can\u2019t tell you how many customers reach out panicking, \u201cWill these actually hold up underwater?\u201d Let me cut through the noise and give you the real, science-backed tea on what our O-rings can (and can\u2019t) do. More O Ring<\/a><\/p>\n

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First off, let\u2019s get one thing straight: not all O-rings are built the same, and that goes double for water. A lot of people think \u201cwater resistance\u201d is a one-size-fits-all label, but it\u2019s actually a spectrum\u2014 and More O Rings sit in a really useful sweet spot for most everyday and semi-demanding water applications. Let\u2019s start with the basics of why an O-ring even works for sealing water: they need to be flexible enough to stretch and conform to surfaces, strong enough to hold that shape under pressure, and resistant to breaking down when exposed to H2O over time. The rubber compound we use for our standard More O Rings is nitrile butadiene rubber (NBR), if you want the technical term, but I\u2019ll keep it simple: it\u2019s a synthetic rubber that\u2019s way better with water than, say, natural rubber (which rots fast) or silicone (which is too squishy for high-pressure jobs). That\u2019s not to say NBR is perfect, but it\u2019s the gold standard for most water-focused sealing tasks, and our specific blend? We tweak the NBR mix with extra binders and anti-oxidants because we tested early on that generic O-rings start to crack after 2\u20133 years submerged, and our customers were tired of replacing them that often.<\/p>\n

Now, let\u2019s talk about pressure, because that\u2019s a big one most people overlook. If you\u2019re using an O-ring on a garden hose bib, that\u2019s 40\u201360 PSI max\u2014 no big deal. Submerge that same O-ring in a swimming pool 10 feet deep? That\u2019s another 4.3 PSI per 10 feet, so 44\u201363 PSI total, still fine. Take that same O-ring and put it in a well pump at 100 PSI? Maybe, but it might not hold as long. Our More O Rings are rated for continuous water pressure up to 150 PSI, and intermittent pressure spikes (like when a faucet slams shut) up to 200 PSI. I\u2019ve had a customer use them for his boat\u2019s below-deck bilge pump for 5 years straight, no leaks, and he tells me that\u2019s way better than the cheaper O-rings he was buying from the hardware store that would blow out every season. That said, if you need something for deep-sea diving (100+ feet, thousands of PSI), our standard NBR O-rings aren\u2019t it\u2014 we have a line of fluorocarbon (FKM) O-rings for that, but those are More O Rings too, just for heavier duty.<\/p>\n

Next up, chemical exposure, because water isn\u2019t just H2O. A lot of times when people ask about water resistance, they\u2019re actually dealing with chlorinated pool water, saltwater, or even water with a little bit of detergent (for washing machine hoses, say). Our standard NBR O-rings handle fresh water and chlorinated tap\/pool water super well\u2014 we ran a test batch submerged in 2 ppm chlorine water for 12 months, and they lost less than 5% of their tensile strength, which is nothing compared to generic O-rings which lost 15\u201320% in the same time. Saltwater is a tiny trickier: salt is mildly corrosive, and over long-term submersion (like 6+ months), it can start to break down rubber a little faster. That\u2019s why I always tell customers if they\u2019re using our O-rings in saltwater (like for a dock lift or a jet ski\u2019s seal), to rinse them with fresh water every month to keep the salt from sitting on them 24\/7. We do have a saltwater-resistant blend of NBR, though\u2014 we call it our Marine Grade More O Rings\u2014 and those can handle full saltwater submersion for up to 18 months straight with minimal degradation, no rinsing required.<\/p>\n

Wait, let\u2019s clear up a common myth: \u201cwaterproof vs. water-resistant\u201d. A lot of people use these words interchangeably, but they\u2019re not. Waterproof means something can hold back water indefinitely under any pressure\u2014 that\u2019s things like a watch\u2019s screw-down crown, or a submarine\u2019s hatch seal. Water-resistant means it\u2019s designed to resist water intrusion for a set period, under specific conditions. Our More O Rings are water-resistant, not fully waterproof\u2014 that\u2019s a key distinction. For example, if you use a More O Ring to seal a garden hose connection, it\u2019s going to keep water from leaking out as long as the connection is tight and the pressure is under 150 PSI. But if you submerge that entire hose in a bucket of water and crimp the end tight? Wait, no\u2014 actually, the hose is full of air, so it would just hold, but if you had a small gap, it might seep in over time. Our O-rings aren\u2019t for sealing against full hydrostatic pressure over years (that\u2019s what heavy-duty industrial FKM O-rings are for), but for 99% of the people reading this\u2014 homeowners, small business owners, even hobbyists\u2014 that\u2019s more than enough.<\/p>\n

Let\u2019s throw in some real customer examples to make this concrete, because numbers don\u2019t mean as much as actual use cases. Last year, I got an email from a guy named Mike who fixes vintage tractors. He needed O-rings for the hydraulic lines on his 1952 John Deere, which he uses to mow his 5-acre pasture. He said the old O-rings he was using would leak hydraulic fluid when they got wet (hydraulic fluid is basically oil, so that\u2019s a whole other thing, but he mentioned they\u2019d also start crumbling after a few months in the damp grass). He ordered 20 of our standard More O Rings, and 6 months later he sent me a photo of his tractor\u2019s hydraulic connection, no leak, and texted, \u201cThese are the first O-rings I\u2019ve used that didn\u2019t turn to goop after the first rain.\u201d Another one: a local coffee shop owner who used our O-rings for their under-sink water filtration system. They were going through O-rings every 2 months because the chlorinated tap water and occasional vinegar descaling agent ate through them. He switched to our Chlorine-Resistant More O Rings, and they\u2019re still going strong 10 months later. That\u2019s exactly the kind of feedback that makes me proud of what we do\u2014 we\u2019re not selling a fancy \u201cwaterproof\u201d lie, we\u2019re selling something that works for real, everyday water jobs.<\/p>\n

Now, what are the limits? No product is perfect, so I don\u2019t want to oversell this. Our More O Rings shouldn\u2019t be used for long-term submersion in hot water over 212\u00b0F (obviously, that\u2019s boiling) or even sustained hot water over 180\u00b0F\u2014 NBR starts to degrade when it\u2019s that hot, so for hot tubs or water heaters, we recommend our high-temperature NBR blend rated up to 250\u00b0F. Also, if you\u2019re dealing with water that has strong chemicals, like bleach or acids, our standard NBR will break down pretty fast\u2014 for those, you\u2019d want FKM O-rings, which we also carry under the More O Rings brand, though they\u2019re a little pricier. And like I said earlier, if you\u2019re going deep underwater (scuba diving, underwater construction), stick to FKM or even silicone for extreme depths. Most people don\u2019t need that, but it\u2019s good to know the line.<\/p>\n

Wait, one more thing that a lot of people don\u2019t think about: installation. An O-ring is only as good as how you put it on. If you stretch it too tight, or scrape it with a sharp edge when you\u2019re installing it, even the best water-resistant O-ring will leak. I always tell customers to lubricate O-rings with a silicone-based lubricant (not petroleum jelly, that eats rubber!) before installing, make sure the groove it\u2019s sitting in is smooth and free of debris, and don\u2019t twist it when you\u2019re sliding it into place. That\u2019s a quick step that makes a huge difference in how long the O-ring holds up in water, no matter the brand.<\/p>\n

At the end of the day, when a customer asks, \u201cWhat\u2019s the water resistance of More O Rings?\u201d my answer is this: for 95% of common water applications (garden hoses, pool filters, washing machines, boat seals, hydraulic lines, faucet connections), our O-rings deliver consistent, leak-free performance for 2\u20135 years, depending on use. We don\u2019t make any wild claims about being \u201c100% waterproof forever\u201d because that\u2019s not realistic for a rubber seal that\u2019s meant to flex and hold pressure. We make O-rings that work for real people, solving real water sealing problems, without overcharging for a label that doesn\u2019t mean anything.<\/p>\n

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If you\u2019re working on a project and you\u2019re not sure which More O Ring is right for your water-related job\u2014 whether it\u2019s a small replacement for a leaky faucet, a bulk order for a commercial pool, or anything in between\u2014 don\u2019t hesitate to reach out. We\u2019re not just a supplier, we\u2019re guys who\u2019ve been in the O-ring game long enough to know what works and what doesn\u2019t, and we\u2019re happy to help you find exactly what you need. Just send over the details of your project, and we can chat through it.<\/p>\n

Fluorosilicone O Ring<\/a> References<\/p>\n

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  1. Rubber Manufacturers Association. (2021). NBR O-Ring Performance in Water-Based Environments. RMA Technical Bulletin TB-007.<\/li>\n
  2. Marine Industry Seal Council. (2022). Long-Term Durability of Elastomeric Seals in Saltwater Applications. MISC Report 12-04.<\/li>\n
  3. International Organization for Standardization. (2019). ISO 3601-1: Elastomeric O-Rings for Fluid Power\u2014 Part 1: Dimensions, tolerances and identification.<\/li>\n<\/ol>\n
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    Zhejiang Jiacheng New Material Co., Ltd.<\/a>
    Zhejiang Jiacheng New Material Co., Ltd. is one of the most professional more o ring manufacturers and suppliers in China, specialized in providing high quality customized products. We warmly welcome you to buy or wholesale more o ring in stock here from our factory. Contact us for quotation and free sample.
    Address: #64 Anjiang Road, Jianshan New Zone, Huangwan Town, Haining City, Jiaxing City, Zhejiang Province
    E-mail: jcseal_zhu@126.com
    WebSite:     https:\/\/www.sjkseal.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey there, if you\u2019ve ever spent time hunting for O-rings for anything from a backyard pool … What is the water resistance of More O Rings?<\/span>Read more<\/a><\/p>\n","protected":false},"author":8,"featured_media":3454,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3417],"class_list":["post-3454","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-more-o-ring-40b7-b037d6"],"_links":{"self":[{"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/posts\/3454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/comments?post=3454"}],"version-history":[{"count":0,"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/posts\/3454\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/posts\/3454"}],"wp:attachment":[{"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/media?parent=3454"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/categories?post=3454"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.imeric-valvebags.com\/blog\/wp-json\/wp\/v2\/tags?post=3454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}