{"id":3498,"date":"2026-10-29T11:09:20","date_gmt":"2026-10-29T03:09:20","guid":{"rendered":"http:\/\/www.yartsevo-mebel.com\/blog\/?p=3498"},"modified":"2026-10-29T11:09:20","modified_gmt":"2026-10-29T03:09:20","slug":"are-door-sealing-strips-resistant-to-uv-rays-4252-00afc1","status":"publish","type":"post","link":"http:\/\/www.yartsevo-mebel.com\/blog\/2026\/10\/29\/are-door-sealing-strips-resistant-to-uv-rays-4252-00afc1\/","title":{"rendered":"Are door sealing strips resistant to UV rays?"},"content":{"rendered":"

Hey there, I\u2019m Maya, and over the last 7 years, I\u2019ve worked hand-in-hand with door and window sealing strips\u2014from troubleshooting a commercial project in Miami that fried strips in 6 months to helping a family in Minnesota pick the right stuff for their lake cabin. So when I get asked this question a lot, especially by contractors and building managers staring at a warehouse loading door baked by the Texas sun or a storefront under brutal Arizona UV? \u201cAre door sealing strips UV-resistant?\u201d It\u2019s not a yes\/no answer, and there\u2019s way more nuance than most people think. Let\u2019s break this down like I would with a regular at our shop, no fancy jargon, just real talk from someone who\u2019s actually lived this. Door and Window Sealing Strips<\/a><\/p>\n

<\/p>\n

First, let\u2019s get one thing straight: not all sealing strips are made the same. That\u2019s probably the biggest mistake I see folks make\u2014they grab the cheapest black EPDM strip off Amazon for a project that\u2019s going to sit outside year-round, and wonder why it\u2019s crumbling by summer\u2019s end. UV rays, for those who slept through 10th grade science, aren\u2019t just that bright light from the sun. They\u2019re high-energy photons that break down chemical bonds in plastics, rubber, and any other material. For sealing strips, that means cracking, shrinking, turning brittle, or just turning into a flaky mess that lets cold air, rain, or bugs slip right through.<\/p>\n

So, let\u2019s start with the materials, because that\u2019s where UV resistance lives. Most good door\/window strips fall into a couple main categories: EPDM, PVC, silicone, and TPE\/TPO. Let\u2019s go through each, plain and simple. EPDM is super common for exterior stuff\u2014roofs, garage doors, commercial storefronts. Now, basic EPDM? Not great with UV. It\u2019s got natural rubber molecules that UV eats through fast, usually in 1-2 years if it\u2019s exposed directly. But here\u2019s the thing: compounded EPDM<\/em>? That\u2019s different. When we make strips, we add UV stabilizers, carbon black (that\u2019s why most good EPDM strips are black, by the way\u2014carbon is like a UV shield), and sometimes antioxidants to fight that breakdown. That boosts its UV resistance to 5-10 years, sometimes longer if it\u2019s not in the direct sun all day. I\u2019ve got a job in Phoenix where our compounded EPDM strips have been on a loading dock for 8 years, still holding tight. It\u2019s not magic\u2014it\u2019s just paying attention to the additives.<\/p>\n

Next up is silicone. Oh, silicone is the heavy hitter for UV. Like, way better than EPDM. Silicone\u2019s chemical structure is basically a backbone of silicon and oxygen, not carbon like rubber and plastic. UV doesn\u2019t break that down easily at all. I\u2019ve seen silicone strips on a window in Florida that\u2019s been exposed to 12 years of brutal sun\u2014still flexible, no cracking, no fading. The only downside? Silicone is more expensive than basic EPDM, and it doesn\u2019t stick as well to some surfaces, so you\u2019ve got to get the right adhesive-backed version if you\u2019re working on thin metal frames. For things like skylights or exterior window perimeters where sun is non-stop? Silicone is the way to go.<\/p>\n

Then there\u2019s PVC. Basic PVC is another one that hates UV. It gets brittle fast, yellows, cracks. But UV-stabilized PVC? We add plasticizers and stabilizers to it, same as EPDM. It\u2019s cheaper than silicone, so it\u2019s popular for residential windows and some light commercial stuff. The catch? It only lasts 3-5 years max in direct sun, compared to 5-10 for compounded EPDM and 10+ for silicone. I\u2019d never recommend basic PVC for an outdoor door seal, but stabilized PVC works great for a basement window that only gets indirect sun.<\/p>\n

And TPE\/TPO? That\u2019s the newer hybrid material, used a lot for newer cars too, but we use it for some exterior door strips. It\u2019s flexible like rubber, easier to install than silicone, and has UV stabilizers built in. Usually lasts 5-7 years in direct sun, so it\u2019s a middle-ground option if you don\u2019t want to splurge on silicone. I installed TPE strips on a bunch of apartment buildings in Austin a few years back\u2014most of the property managers say they\u2019re still going strong, even through that brutal Texas heat.<\/p>\n

Wait, but here\u2019s a trick most people don\u2019t know about UV testing. It\u2019s not just about the material. Installation<\/em> matters so much. If you mount a seal on a door that\u2019s always facing north, getting indirect sun only a few hours a day? It\u2019s gonna last way longer than a seal on a south-facing door that\u2019s in full sun from dawn to dusk. Also, exposure to other things\u2014like ozone from cars, or chemicals from cleaners\u2014can make UV break it down faster. I had a customer last year who used a harsh chemical degreaser on their garage door, and that combined with UV made their EPDM strip crumble in 18 months instead of 6. It\u2019s not just the strip, it\u2019s how you use it.<\/p>\n

Now, let\u2019s talk about what bad UV damage actually looks like, because it\u2019s not always obvious at first. Most people think yellowing is the first sign, but actually, that\u2019s just surface stuff. The real damage is underneath: tiny hairline cracks, shrinking so the strip no longer seals tight, or it gets so brittle it falls apart when you close the door. I had a guy come to our shop last winter complaining his warehouse door was leaking heat, and when I pulled the strip off, it was flaking like old paint. Turns out he\u2019d bought generic strips from a hardware store, not UV-stabilized, and they\u2019d been baking in the sun for 18 months. He lost like $2,000 in heating bills that year\u2014way more than the extra cost of a good strip.<\/p>\n

So, what do we recommend to customers? If you\u2019re working on exterior applications<\/em>\u2014front doors, garage doors, storefronts, skylights, exterior window perimeters\u2014skip basic EPDM and basic PVC. Go for either our UV-compounded EPDM or silicone. If you\u2019re on a budget, compounded EPDM is the sweet spot\u2014costs about 20% more than basic, lasts 3x longer. If it\u2019s a super sunny, hot area (like Arizona, Southern California, Florida), spring for silicone. For interior applications<\/em>\u2014like interior doors, basement windows, areas that don\u2019t get direct sun\u2014basic EPDM or stabilized PVC works fine, no need to splurge on extra UV protection.<\/p>\n

Wait, also, let\u2019s clear up a myth: just because a strip says \u201cUV-resistant\u201d on the label doesn\u2019t mean it\u2019s actually good. A lot of cheap sellers slap that label on strips that only have a tiny amount of stabilizer, so they last 2 years max. That\u2019s why we test every batch at our small factory\u2014we put samples in UV chambers that mimic 10 years of sun in 3 months, and only sell strips that pass. If you\u2019re buying from a random online store, check the specs: look for mention of carbon black content (for EPDM), or silicone if it\u2019s that material. And if a price seems too good to be true for exterior strips? It probably is.<\/p>\n

<\/p>\n

I get that it\u2019s overwhelming, especially if you\u2019re a contractor juggling 10 projects or a homeowner trying to fix a door before winter. At the end of the day, UV resistance in sealing strips isn\u2019t a one-size-fits-all thing. It\u2019s about matching the material to the exposure. You wouldn\u2019t use a rain jacket designed for light drizzle in a monsoon, right? Same idea. Sealing strips are there to keep out air, water, bugs, all that, and if you pick the wrong one for the sun it\u2019s getting, it\u2019s gonna fail way sooner than it should.<\/p>\n

Silicone Sponge<\/a> If you\u2019re not sure what you need, hit me up. We can talk about your project, where it\u2019s located, how much sun the seals will get, and I\u2019ll point you to the right strip. No pressure, no upsell, just real advice from someone who\u2019s been doing this long enough to know what works. Whether you\u2019re a contractor needing 100 feet of commercial strip or a homeowner fixing your back door, I\u2019m here to help. Let\u2019s make sure your seals last, no matter how much sun they face.<\/p>\n

References<\/h3>\n
    \n
  1. ASTM International. (2020). Standard Test Method for Rubber Property\u2014Effect of Artificial Weathering by Exposure to Open Flame Carbon Arc Light. ASTM D750.<\/li>\n
  2. European Committee for Standardization. (2018). Elastomeric Seals for Windows and Doors\u2014Requirements for External Seals. EN 12365.<\/li>\n
  3. American Architectural Manufacturers Association. (2021). Guide to Sealing Materials for Exterior Building Applications. AAMA 712-21.<\/li>\n<\/ol>\n
    \n

    Jinjiang Yunli Technology Co., Ltd.<\/a>
    We’re known as one of the most reliable door and window sealing strips manufacturers and suppliers in China. With abundant experience, we warmly welcome you to buy customized door and window sealing strips at competitive price from our factory. If you have any enquiry about cooperation, please feel free to email us.
    Address: Suqian Industrial Zone, Luoshan Street, Jinjiang City, Fujian Province, China
    E-mail: sales@flexmer.com
    WebSite:     https:\/\/www.flexmers.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey there, I\u2019m Maya, and over the last 7 years, I\u2019ve worked hand-in-hand with door and … Are door sealing strips resistant to UV rays?<\/span>Read more<\/a><\/p>\n","protected":false},"author":287,"featured_media":3498,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3461],"class_list":["post-3498","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-door-and-window-sealing-strips-404b-00e3de"],"_links":{"self":[{"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/posts\/3498","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/users\/287"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/comments?post=3498"}],"version-history":[{"count":0,"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/posts\/3498\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/posts\/3498"}],"wp:attachment":[{"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/media?parent=3498"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/categories?post=3498"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yartsevo-mebel.com\/blog\/wp-json\/wp\/v2\/tags?post=3498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}