{"id":1682,"date":"2026-11-10T17:27:00","date_gmt":"2026-11-10T09:27:00","guid":{"rendered":"https:\/\/www.bosssealing.com\/?p=1682"},"modified":"2026-11-10T17:27:17","modified_gmt":"2026-11-10T09:27:17","slug":"leechfriksje-pneumatyske-ofdichtingen","status":"publish","type":"post","link":"https:\/\/www.bosssealing.com\/fy\/low-friction-pneumatic-seals\/","title":{"rendered":"Hoe jo lege-friksje pneumatyske silinderdichtingen spesifisearje"},"content":{"rendered":"<p>In pneumatyske silinder mei in boarring fan 32 mm, levere by 1 bar, produsearret sa'n 80 N teoretyske stjitkr\u00eaft. L\u00fbk d\u00ear de wriuwing fan 'e stang en de lieding fan \u00f4f, l\u00fbk de lading der\u00f4f, l\u00fbk de druk der\u00f4f dy't ferlern giet troch in buis fan 3 meter en twa oanslutings, en de marzje dy't oerbliuwt om de suiger te ferpleatsen is faak minder as 25 N. Set dan in sealing yn dy gland mei 15 N losbrekwriuwing en de silinder h\u00e2ldt op betrouber te bewegen \u2014 net om't er te lyts is, mar om't de sealing keazen wie fan in katalogusbl\u00ead dat in wriuwingko\u00ebffisjint neamde s\u00fbnder testbetingsten derby.<\/p>\n<p>Pneumatyske sealing mei lege wriuwing is earst in probleem fan kr\u00eaftbudzjet en dan pas in materiaalprobleem. De spesifikaasje dy't wurket, jout de losbrekkr\u00eaft oan dy't de silinder ferneare kin, de snelheid en druk w\u00earby't dy mjitten wurde moat, en it lek dat net akseptabel is. Al it oare \u2014 profyl, mingsel, \u00f4fwurking \u2014 folget \u00fat dy trije sifers.<\/p>\n<figure><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.bosssealing.com\/wp-content\/uploads\/2026\/11\/a2_hero.jpg\" alt=\"Pneumatic cylinder seal kit components laid out beside an ISO 15552 aluminium cylinder\" width=\"1536\" height=\"944\" loading=\"eager\" \/><figcaption>In pneumatysk sealpakket: suigersealing, stangsealing, wisker, buffersealings en liedringen. Elk d\u00earfan bringt syn eigen wjerst\u00e2n mei.<\/figcaption><\/figure>\n<h2>Begjin mei it kr\u00eaftbudzjet<\/h2>\n<p>Nim de leechste druk w\u00earby't de silinder begjinne moat te bewegen, net de nominale oanfierdruk. Yn in masine dy't op 6 bar draait, is it krityske gefal meastentiids in silinder dy't by it ynstellen mei 0,5-1 bar stikje foar stikje foar\u00fat moat, of ien fan fjouwer aktuatoren dy't allegear tagelyk slaan en de druk yn it manifold sakje litte.<\/p>\n<p>Rekkenje de sifers \u00fat foar in boarring fan 32 mm by 0,5 bar:<\/p>\n<ul>\n<li>Teoretyske stjitkr\u00eaft: 804 mm\u00b2 \u00d7 0,05 MPa = 40 N.<\/li>\n<li>Wriuwing fan lieding en stanglagers: 5-10 N by goede \u00fatrjochting, mear as de lading troch de silinder sels liedt wurdt.<\/li>\n<li>Weromfear, by ienwurkjend: 10-20% fan 'e stjitkr\u00eaft.<\/li>\n<li>Oer foar wriuwing fan 'e sealing: 10-25 N, en dat is it hiele budzjet foar sawol de suigersealing as de stangsealing.<\/li>\n<\/ul>\n<p>In standertsilinder hat r\u00fbchwei 300-600 mbar nedich allinnich om los te brekken, wat by dizze boarring 24-48 N wriuwing fan 'e sealing is. In soepel draaiende silinder hat 10-100 mbar nedich, of 0,8-8 N. Dat ferskil is gjin marketing: it is it ferskil tusken in silinder dy't posisjonearret by 1 bar en ien dy't f\u00eastslacht.<\/p>\n<h2>Fjouwer sealingskonsepten en wat elk kostet oan wjerst\u00e2n<\/h2>\n<p>It profyl bepaalt hoe't de kontakt druk opboud wurdt. Elastomeerlippen fertrouwe op ynterferinsje plus luchtdruk; PTFE-eleminten fertrouwe op in fear of in elastomeer-energizer; yntegrearre sealings-en-liedings\u00fbntwerpen ruilje ien partn\u00fbmer foar strakkere toler\u00e2nsjes. De <a href=\"https:\/\/www.trelleborg.com\/en\/seals\/products-and-solutions\/pneumatic-seals\" rel=\"noopener\" target=\"_blank\">publisearre pneumatyske sealingsrigen<\/a> fan 'e grutte fabrikanten folgje deselde fjouwer famyljes, wat it ferlykjen fan in fersliten part ridlik ienf\u00e2ldich makket.<\/p>\n<table>\n<caption>Tabel 1 \u2014 Pneumatyske sealingskonsepten ferlike op wjerst\u00e2n, lek en libbensdoer<\/caption>\n<thead>\n<tr>\n<th>Konsept<\/th>\n<th>Losbrekgedrach<\/th>\n<th>Sealing by lege druk<\/th>\n<th>B\u00easte tsjinst<\/th>\n<th>Haadrisiko<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Elastomeerlippe (NBR of PU)<\/td>\n<td>Heechst; typysk 10-25 N by in boarring fan 32 mm<\/td>\n<td>Goed ienris boppe 0,3 bar<\/td>\n<td>Algemiene automatisearring, 1-6 bar, matige syklusen<\/td>\n<td>Stick-slip nei lang stilstean<\/td>\n<\/tr>\n<tr>\n<td>Lippeprofyl mei koart kontakt (byg. C2-type)<\/td>\n<td>Matich; lytser kontaktflak<\/td>\n<td>Goed<\/td>\n<td>Fluch syklusjen, luchtsjirrende circuits<\/td>\n<td>Gefoelich foar r\u00fbnens fan 'e boarring en fersmoarging<\/td>\n<\/tr>\n<tr>\n<td>PTFE- of fol-PTFE-glidelemint mei elastomeer-energizer<\/td>\n<td>Leechste elastomeeropsje; minimale stiction<\/td>\n<td>Fereasket foarspanning fan 'e energizer<\/td>\n<td>Hiel lege snelheid, oaljefrije lucht, cleanrooms<\/td>\n<td>Kr\u00fbp, slyt, skea by ynstallaasje<\/td>\n<\/tr>\n<tr>\n<td>Yntegrearre sealing en liedring<\/td>\n<td>Middel<\/td>\n<td>Goed<\/td>\n<td>Koarte slach, kompakte silinders<\/td>\n<td>Kin de aparte draachkapasiteit \u00fbnder sydlading net ferfange<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>It profyl mei koart kontakt is de meast foarkommende upgrade foar masines dy't al op 4-6 bar draaie en allinnich flugger reaksje nedich hawwe. It ferminderet it glide-oerflak s\u00fbnder it mingsel te feroarjen, w\u00eartroch't it meastentiids minder kostet as in omskeakeling nei PTFE en gjin feroaring oan 'e suigergroef fereasket.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bosssealing.com\/wp-content\/uploads\/2026\/11\/a2_profile.jpg\" alt=\"Close-up of a low-friction pneumatic piston seal lip contacting an anodised aluminium cylinder bore\" width=\"1536\" height=\"944\" \/><figcaption>Kontaktbreedte, net hurdens fan it mingsel, is de earste hefboom op 'e losbrekkr\u00eaft.<\/figcaption><\/figure>\n<h2>Ynterferinsje en kontaktbreedte bepale de losbrekkr\u00eaft<\/h2>\n<p>Wriuwingkr\u00eaft is r\u00fbchwei it produkt fan kontakt druk en kontaktflak, plus de term foar skuorring fan 'e film fan hokker smeermiddel dan ek dat yn 'e grinsflak oerbliuwt. Yn in pneumatyske sealing komt kontakt druk fan radiale ynterferinsje \u2014 de mjitte w\u00earyn't de frije b\u00fbtendiameter fan 'e sealing de boarring te boppe giet.<\/p>\n<p>Te folle ynterferinsje is it meast foarkommende fabryksdefekt dat wy sjogge by neimarkspneumatyske sealings. In sealing dy't 0,15 mm boppe nominaal getten is, sil prachtich tichtsje en de silinder kleverich oanfiele; deselde sealing op nominaal sil gl\u00ead oanfiele en kin by 0,2 bar swiere. Gjin fan beide gedragingen komt nei foaren yn in dimensjerapport, \u00fatsein as it rapport de diameter yn frije tast\u00e2n en de boarring d\u00ear't tsjin mjitten wurdt, befettet.<\/p>\n<p>Trije praktyske regels:<\/p>\n<ol>\n<li>Freegje om 'e radiale ynterferinsje yn frije tast\u00e2n, net allinnich om 'e \u00f4fmjittings fan 'e groef en de boarring. It is it sifer dat de wjerst\u00e2n bepaalt.<\/li>\n<li>H\u00e2ld de ynterferinsje oan 'e lege kant fan it berik as de silinder by lege druk draait, en oan 'e hege kant as de \u00f4fwurking fan 'e boarring r\u00fbch is of de lucht wiet is.<\/li>\n<li>Kompensearje nea foar in fersliten boarring troch in te grutte sealing te montearjen. It leveret in wike tichtsjen en in moanne stick-slip.<\/li>\n<\/ol>\n<h2>\u00d4fwurking fan boarring en stang: de fermannichf\u00e2ldiger dy't nimmen kontrolearret<\/h2>\n<p>Oerflak\u00f4fwurking feroaret sawol de wriuwing as it lek, en se feroaret se yn tsjinoerstelde rjochtingen. Te r\u00fbch en de sealing slitet, de smeermiddelfilm brekt en de silinder lekt; te gl\u00ead en it oerflak kin hielendal gjin film h\u00e2lde, sadat de losbrekwriuwing omheech giet en de sealing by lege snelheid klappert.<\/p>\n<table>\n<caption>Tabel 2 \u2014 Doelen foar pneumatyske tsjinflakken (typyske wearden; kontrolearje tsjin 'e tekening fan jo silinderfabrikant)<\/caption>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Doel<\/th>\n<th>Effekt by b\u00fbten berik<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Bore-r\u00fbchheid Ra<\/td>\n<td>0,2-0,4 \u00b5m<\/td>\n<td>R\u00fbger: sealdraach en lekkaazje. Gl\u00eader: filmferhongering, hegere stiktsyksje<\/td>\n<\/tr>\n<tr>\n<td>Rod-r\u00fbchheid Ra<\/td>\n<td>0,1-0,3 \u00b5m, hurdgromearre of keramysk<\/td>\n<td>R\u00fbger: wiperdraach, yndringen fan smoargens<\/td>\n<\/tr>\n<tr>\n<td>R\u00fbnheid fan de bore<\/td>\n<td>Binnen de helte fan it ynterferinsjeberik fan de seal<\/td>\n<td>In ovale bore konsintrearret kontakt op twa b\u00f4gen en ferd\u00fbbelet de pleatslike druk<\/td>\n<\/tr>\n<tr>\n<td>Oerflakstruktuer<\/td>\n<td>Omtrek, gjin spiraal- of aksiale kerven<\/td>\n<td>Aksiale markearrings pompe oalje by de seal l\u00e2ns en snije de lip<\/td>\n<\/tr>\n<tr>\n<td>Hurd anodisearre laach<\/td>\n<td>25-50 \u00b5m, fersegele<\/td>\n<td>Tinne of net-fersegele coating slitet troch en leit aluminiumokside-skuorbl\u00ead bleat<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>ISO 15552 stelt montaazjemaaten f\u00east, net de \u00f4fwurking fan de bore, sadat twa silinders dy't identyk f\u00eastbout wurde kinne, hiel oars \u00f4fslute kinne. <a href=\"https:\/\/www.eriks.com\/en\/knowledge-center\" rel=\"nofollow noopener\" target=\"_blank\">Technyske bibleteken fan sealdistributeurs<\/a> binne hjir nuttich, om't se de oanbefellings foar tsjinflakken sammelje dy't silinderkatalogussen meastentiids weilitte. As in klant meldt dat in seal yn 'e iene masine wurket en yn in oare net, mei deselde silindermodel, is de bore it earste dat mjitten wurde moat, en it twadde is de r\u00fbnheid fan de bore by it dwersgat fan de poarte, d\u00ear't it hoanngereidskip faak in leech plak efterlit.<\/p>\n<h2>Smering: Oaljefrije loft is net fetfrij<\/h2>\n<p>Hast elke pneumatyske seal wurdt montearre mei in film fet en draait d\u00earnei op loft dy't gjin oalje meinimt. Dy earste lading wurdt ferwachte de libbensdoer fan de seal yn in skjin systeem te h\u00e2lden, w\u00earom't de kar fan montaazjefet likefolle \u00fatmakket as de mingsel. In fet dat migrearret of oksidearret lit de lip binnen in pear h\u00fbndertt\u00fbzen syklusen droech, en droech draaie op in anodisearre bore is de fluchste wei nei in gl\u00eade, lekkende seal.<\/p>\n<p>Letter smeermiddel oan de loftline tafoegje is in f\u00eastlizzing. Sadree't oalje yntrodusearre is, moat dy kontinu \u00fbnderh\u00e2lden wurde, want in seal dy't yn oalje opswold is, sil krimpe en lekke as de smearder dr\u00fbch rint. <a href=\"https:\/\/www.darcoid.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Sealhannelers<\/a> sjogge geregeldwei de gefolgen fan dit patroan: in silinder dy't twa jier droech draaide, doe in smearder krige as \u201coplossing\u201d, en trije moannen letter lekke. Foar fiedings-, farmaseutyske en semiconductorlinen is oaljefrij bedriuw ferplichte, en it goede antwurd is in PTFE-basearre elemint mei in lipgeometrie dy't smeermiddel f\u00easth\u00e2ldt, ynstee fan in leechfriksje-elastomear dat droech draait.<\/p>\n<p>Hurdfens is hjir in sekund\u00eare hefboom. In NBR-seal fan 90 Shore A ferfoarmet minder \u00fbnder deselde ynterferinsje en kin de losbrekker\u00eafting wat ferleegje, mar hy sl\u00fat ek minder goed \u00f4f op in r\u00fbge bore. Yn 'e praktyk ferskoot it feroarjen fan <a href=\"https:\/\/www.astm.org\/standards\/d2240\" rel=\"noopener\" target=\"_blank\">durometerhurdfens<\/a> mei 5 punten de friksje minder as it feroarjen fan de kontaktbreedte mei 0,2 mm.<\/p>\n<p>Snelheid is de oare helte fan de fergeliking, en dy hat in \u00fbndergrins. Under r\u00fbchwei 5 mm\/s wikselje de measte silinders mei elastomearlip tusken f\u00easth\u00e2lden en gliden, en de minimale stabile snelheid hinget \u00f4f fan de boargrutte: <a href=\"https:\/\/www.smcworld.com\/en-jp\/\" rel=\"noopener\" target=\"_blank\">SMC<\/a> wurdearret selektearre leechsnelheidssilinders op 0,5 mm\/s, mar jout 1 mm\/s oan bores fan 16 mm en lytser. As jo tapassing gl\u00eade beweging by 1 mm\/s yn in bore fan 12 mm nedich hat, sil gjin mingselferoaring dat leverje \u2014 de silinderarsjitektuer moat feroarje.<\/p>\n<h2>Hoe't jo de losbrekker\u00eafting op in echte silinder mjitte<\/h2>\n<p>Friksjesifers \u00fat katalogussen binne seleksjedata, gjin akseptaazjekriteria. Mjitte op de eigentlike silinder, mei de eigentlike loftfoarsjenning, by de druk dy't de masine br\u00fbkt.<\/p>\n<ol>\n<li>Montearje de silinder fertikaal of horizontaal sa't er ynstallearre is, mei de echte lading deroan as dat kin.<\/li>\n<li>Set in drukmeter en in presysdrukregelaar by de silinderpoarte, net by de FRL-ienheid.<\/li>\n<li>Ferheegje de druk stadich fan nul en registrearje de druk w\u00earby't de stang foar it earst beweecht. Dat is de losbrek.<\/li>\n<li>Werhelje nei in ferbliuw fan 10 minuten yn r\u00east, en d\u00earnei nei 1.000 syklusen. Stik-slip docht bliken as in stigend losbrekn\u00fbmer oer de ferbliuwen.<\/li>\n<li>Mjit dan de rinnende friksje: meitsje in slag by konstante snelheid en registrearje it drukferskil tusken de beide keamers.<\/li>\n<li>Test beide rjochtingen. Ut- en yntrek hawwe ferskillende effektive oerflakken en faak oar sealdrach.<\/li>\n<\/ol>\n<p>In nuttich akseptaazjedoel foar in leechfriksjekring is in losbrek \u00fbnder 100 mbar by de wurkboare, en rinnende friksje stabyl binnen \u00b120% oer de hiele slag. As de losbrek stiget mei it ferbliuw mar de rinnende friksje flak bliuwt, hawwe jo in smeermiddel- of mingselprobleem. As beide stige, sjoch dan earst nei de \u00f4fwurking fan de bore en de \u00fatrjochting.<\/p>\n<h2>De spesifikaasje skriuwen<\/h2>\n<p>De measte pneumatyske sealspesifikaasjes dy't wy krije, neame in hurdfens, in kleur en in silindermodel. Dat is gen\u00f4ch om in part te offerearjen en net gen\u00f4ch om gedrach te garandearjen. De tabel hjir\u00fbnder is de ferzje dy't in twadde-boarne-oefening oerlibbet.<\/p>\n<table>\n<caption>Tabel 3 \u2014 Spesifikaasjebl\u00ead foar pneumatyske seal: wat te neamen en w\u00earom<\/caption>\n<thead>\n<tr>\n<th>Kostpost<\/th>\n<th>Foarbyldwearde<\/th>\n<th>W\u00earom't it \u00fatmakket<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Sealtype en profyl<\/td>\n<td>Pistonlip-seal, koart kontakt, d\u00fbbelwurkjend<\/td>\n<td>F\u00eastiget de wriuwbasis foardat materiaal besprutsen wurdt<\/td>\n<\/tr>\n<tr>\n<td>Mingsel en hurdfens<\/td>\n<td>PU 92 Shore A, of NBR 70 Shore A, kwaliteit mei lege kompresjeset<\/td>\n<td>PU resists abrasion; NBR is more forgiving on rough bores<\/td>\n<\/tr>\n<tr>\n<td>Operating pressure range<\/td>\n<td>0.5-10 bar, per cylinder rating<\/td>\n<td>Below 0.5 bar the seal must rely on interference alone<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td>-20 to +80 \u00b0C standard; -20 to +150 \u00b0C high-temp option<\/td>\n<td>Standard ISO 15552 cylinders are rated -20 to +80 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Breakaway force<\/td>\n<td>\u2264 100 mbar equivalent at 32 mm bore, after 10 min dwell<\/td>\n<td>The only number that reflects real starting behaviour<\/td>\n<\/tr>\n<tr>\n<td>Air quality<\/td>\n<td>ISO 8573-1 class 3.4.3, or oil-free class 2.2.2<\/td>\n<td>Determines grease life and whether PTFE is required<\/td>\n<\/tr>\n<tr>\n<td>Bore and rod finish<\/td>\n<td>Ra 0.2-0.4 \u00b5m bore, Ra 0.1-0.3 \u00b5m rod<\/td>\n<td>Half of all &#8220;bad seal&#8221; complaints are a finish complaint<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Two of those lines are unusual in a purchase order and both are worth the argument. Breakaway force is the only acceptance criterion that reflects what the machine actually does, and air quality determines whether the grease you assembled with will still be there in year three. A supplier who cannot discuss either number is selling parts, not sealing.<\/p>\n<p>For cylinders where the seal and the guide share the load, the <a href=\"https:\/\/www.bosssealing.com\/fy\/produkt-kategory\/liedende-eleminten\/\">guide ring<\/a> choice affects friction as much as the seal does: a worn or undersized wear band lets the piston tilt, which loads one side of the lip and doubles local contact pressure. Similarly, if the rod wiper is letting dust through, the piston seal is being asked to survive an abrasive that no compound is designed for \u2014 our note on <a href=\"https:\/\/www.bosssealing.com\/fy\/oarsaken-fan-hydraulyske-seel-faljen\/\">seal failure patterns<\/a> covers the visual signatures.<\/p>\n<h2>A Specification Checklist<\/h2>\n<p>Run through these before releasing a pneumatic seal drawing. Each line corresponds to a field failure we have seen more than once.<\/p>\n<ol>\n<li><strong>State the lowest starting pressure<\/strong>, not the nominal supply. If the machine needs motion at 0.5 bar, the seal is a 0.5 bar seal.<\/li>\n<li><strong>Convert force to friction.<\/strong> Divide the available thrust by the seal count \u2014 piston seal plus rod seal \u2014 and check that the result leaves margin for guide drag and load.<\/li>\n<li><strong>Name the profile<\/strong>, not just the material. Short-contact lips and standard lips use the same compound and behave differently.<\/li>\n<li><strong>Specify free-state interference<\/strong> and require it on the inspection report, alongside groove depth and bore diameter.<\/li>\n<li><strong>Write the surface finish<\/strong> for bore and rod, and include roundness. A roughness callout alone lets an oval bore through.<\/li>\n<li><strong>Define the air quality class<\/strong> and decide, in writing, whether the system is oil-free. Retrofitting a lubricator later invalidates the seal choice.<\/li>\n<li><strong>Require a breakaway test<\/strong> at first article and after 1,000 cycles, with the dwell time stated.<\/li>\n<li><strong>Check the guide<\/strong> before blaming the seal. Side load and bore ovality present as seal friction and seal leakage.<\/li>\n<\/ol>\n<p>Most of the low-friction problems we are asked to solve turn out to be specification problems rather than compound problems. The <a href=\"https:\/\/www.bosssealing.com\/fy\/produkt-kategory\/pneumatyske-sealen-pneumatyske-sealkits\/\">pneumatyske seelrige<\/a> covers lip seals, piston seals and complete kits in PU, NBR and filled PTFE, and the groove dimensions are interchangeable with the common ISO 15552 series; if you send the cylinder model and the force budget, we can tell you which profile fits before anyone cuts a mould. For static sealing inside the same cylinder \u2014 port seals, cushion seals, end-cap O-rings \u2014 a standard <a href=\"https:\/\/www.bosssealing.com\/fy\/produkt-kategory\/rubber-o-ringx-ring\/\">O-ring or X-ring<\/a> in a 70 Shore A NBR is usually the right answer, provided the groove is sized for the pressure.<\/p>","protected":false},"excerpt":{"rendered":"<p>Lege-friksje pneumatyske \u00f4fdichting is in probleem fan kr\u00eaftbudzjet. Hoe jo in losbrek-doel stelle, it profyl kieze en de boarring-\u00f4fwurking spesifisearje dy't it werhelber makket.<\/p>","protected":false},"author":1,"featured_media":1677,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"A force-budget method for specifying low-friction pneumatic seals: breakaway limits, profile choice, bore finish targets and a test procedure that holds.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"boss\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.bosssealing.com\/fy\/low-friction-pneumatic-seals\/\" \/>\n\t\t<meta 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