[{"data":1,"prerenderedAt":646},["ShallowReactive",2],{"site-footer-common":3,"glossary:fibreglass-filter-bag":45,"glossary-related:fibreglass-filter-bag":177},{"id":4,"extension":5,"footer":6,"meta":40,"navbar":41,"stem":43,"__hash__":44},"common\u002Fcommon.yml","yml",{"tagline":7,"links":8,"sections":9},"Acoustic cleaning intelligence for industrial fouling, soot, ash, dust and build-up.",[],[10,19,31],{"title":11,"links":12},"Product",[13,16],{"label":14,"to":15},"How it works","\u002F#product",{"label":17,"to":18},"Cost assessment","\u002F#hero",{"title":20,"links":21},"Company",[22,25,28],{"label":23,"to":24},"What we build","\u002F#about",{"label":26,"to":27},"Careers","\u002F#careers",{"label":29,"to":30},"Contact","\u002F#contact",{"title":32,"links":33},"Resources",[34,37],{"label":35,"to":36},"Blog","\u002Fresources\u002Fblog",{"label":38,"to":39},"Glossary","\u002Fglossary",{},{"links":42},[],"common","YocmZRy1AYfBbpgGVms-zhdiABlF8VTxHx6h4rDmZBA",{"id":46,"title":47,"aliases":48,"body":52,"category":158,"description":159,"extension":160,"meta":161,"navigation":162,"path":163,"relatedTerms":164,"seo":168,"sources":171,"stem":175,"term":47,"__hash__":176},"glossary\u002Fglossary\u002Ffibreglass-filter-bag.md","Fibreglass filter bag",[49,50,51],"fibreglass bag","glass-fibre filter bag","woven fibreglass bag",{"type":53,"value":54,"toc":150},"minimark",[55,70,75,88,92,117,121,128,132],[56,57,58,59,63,64,69],"p",{},"A ",[60,61,62],"strong",{},"fibreglass filter bag"," is woven from glass-fibre yarn, normally finished with a PTFE, silicone or graphite coating to improve flex resistance and dust release. Continuous service rating is up to 260 °C, peaking briefly higher. Fibreglass is the standard bag medium for coal-fired utility ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Freverse-air-baghouse","reverse-air baghouses"," and for high-temperature cement-kiln duty.",[71,72,74],"h2",{"id":73},"strengths","Strengths",[76,77,78,82,85],"ul",{},[79,80,81],"li",{},"Highest continuous-temperature rating of mainstream media (260 °C)",[79,83,84],{},"Dimensionally stable, low thermal shrinkage",[79,86,87],{},"Compatible with sulphurous flue gas after appropriate coating",[71,89,91],{"id":90},"weaknesses","Weaknesses",[76,93,94,106,114],{},[79,95,96,97,101,102,105],{},"Brittle — does not tolerate sharp flexing from aggressive ",[65,98,100],{"href":99},"\u002Fglossary\u002Fpulse-jet-cleaning-cycle","pulse-jet cleaning","; favours ",[65,103,104],{"href":67},"reverse-air"," design",[79,107,108,109,113],{},"Limited cleanability — cake can adhere; often paired with a ",[65,110,112],{"href":111},"\u002Fglossary\u002Fptfe-membrane-filter-bag","PTFE membrane"," overlay for tighter outlet limits",[79,115,116],{},"Hydrolyses below the acid dew point in sulphurous gas",[71,118,120],{"id":119},"acoustic-cleaning-compatibility","Acoustic cleaning compatibility",[56,122,123,127],{},[65,124,126],{"href":125},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," installed on a reverse-air fibreglass baghouse supplement the gentle reverse-air cycle without the bag-flex fatigue that would arise from more aggressive primary cleaning. This is a particularly well-suited combination on coal-fired utility duty.",[71,129,131],{"id":130},"related-terms","Related terms",[76,133,134,140,145],{},[79,135,136],{},[65,137,139],{"href":138},"\u002Fglossary\u002Ffilter-bag","Filter bag",[79,141,142],{},[65,143,144],{"href":67},"Reverse-air baghouse",[79,146,147],{},[65,148,149],{"href":111},"PTFE-membrane filter bag",{"title":151,"searchDepth":152,"depth":152,"links":153},"",2,[154,155,156,157],{"id":73,"depth":152,"text":74},{"id":90,"depth":152,"text":91},{"id":119,"depth":152,"text":120},{"id":130,"depth":152,"text":131},"baghouse","A fibreglass filter bag is woven from glass-fibre yarn, normally finished with a PTFE, silicone or graphite coating to improve flex resistance and dust release. Continuous service rating is up to 260 °C, peaking briefly higher. Fibreglass is the standard bag medium for coal-fired utility reverse-air baghouses and for high-temperature cement-kiln duty.","md",{},true,"\u002Fglossary\u002Ffibreglass-filter-bag",[165,166,167],"filter-bag","reverse-air-baghouse","ptfe-membrane-filter-bag",{"title":169,"description":170},"Fibreglass filter bag — high-temperature woven glass-fibre media","A fibreglass filter bag is woven from glass-fibre yarn and rated for continuous service to 260 °C. The standard bag for coal-fired utility reverse-air baghouses and high-temperature cement duty.",[172],{"title":173,"url":174},"Wikipedia — Glass fiber","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FGlass_fiber","glossary\u002Ffibreglass-filter-bag","K4E_bDUfLfeDnwtweWrmFOhrQheCTeIO81M9O_GC1Oc",[178,414,537],{"id":179,"title":139,"aliases":180,"body":183,"category":158,"description":397,"extension":160,"meta":398,"navigation":162,"path":138,"relatedTerms":399,"seo":405,"sources":408,"stem":412,"term":139,"__hash__":413},"glossary\u002Fglossary\u002Ffilter-bag.md",[181,182],"filter bags","bag (baghouse)",{"type":53,"value":184,"toc":392},[185,206,210,222,321,325,360,362],[56,186,58,187,190,191,195,196,200,201,205],{},[60,188,189],{},"filter bag"," is the cylindrical fabric sock that traps particulate inside a ",[65,192,194],{"href":193},"\u002Fglossary\u002Ffabric-filter","fabric filter",". Bags are typically 120–300 mm in diameter and 2–10 m long, suspended vertically from the ",[65,197,199],{"href":198},"\u002Fglossary\u002Ftubesheet","tubesheet",", supported internally by a wire ",[65,202,204],{"href":203},"\u002Fglossary\u002Fbag-cage","bag cage"," and sealed at the top by a snap-band collar.",[71,207,209],{"id":208},"media-selection","Media selection",[56,211,212,213,217,218,221],{},"Bag media must match the application temperature, gas chemistry, dust load and cleaning system. See ",[65,214,216],{"href":215},"\u002Fglossary\u002Fp84-nomex-ryton-filter-media","P84 \u002F Nomex \u002F Ryton filter media"," and ",[65,219,220],{"href":111},"PTFE membrane filter bag",".",[223,224,225,241],"table",{},[226,227,228],"thead",{},[229,230,231,235,238],"tr",{},[232,233,234],"th",{},"Material",[232,236,237],{},"Max continuous temp",[232,239,240],{},"Typical use",[242,243,244,256,267,278,289,300,311],"tbody",{},[229,245,246,250,253],{},[247,248,249],"td",{},"Polyester",[247,251,252],{},"135 °C",[247,254,255],{},"Cement, food, light industrial",[229,257,258,261,264],{},[247,259,260],{},"Polypropylene",[247,262,263],{},"90 °C",[247,265,266],{},"Wet chemistry, washdown",[229,268,269,272,275],{},[247,270,271],{},"Nomex (aramid)",[247,273,274],{},"200 °C",[247,276,277],{},"Asphalt, metallurgical",[229,279,280,283,286],{},[247,281,282],{},"P84 (polyimide)",[247,284,285],{},"240 °C",[247,287,288],{},"Cement, biomass",[229,290,291,294,297],{},[247,292,293],{},"Ryton (PPS)",[247,295,296],{},"190 °C",[247,298,299],{},"Coal-fired utility, sulphur-rich",[229,301,302,305,308],{},[247,303,304],{},"Fibreglass",[247,306,307],{},"260 °C",[247,309,310],{},"Cement, WtE high-temperature",[229,312,313,316,318],{},[247,314,315],{},"PTFE (Teflon)",[247,317,307],{},[247,319,320],{},"Aggressive chemistry, sub-mg outlet",[71,322,324],{"id":323},"failure-modes","Failure modes",[76,326,327,336,342,348,354],{},[79,328,329,335],{},[60,330,331],{},[65,332,334],{"href":333},"\u002Fglossary\u002Fbag-blinding","Bag blinding"," — pore choking that raises ΔP",[79,337,338,341],{},[60,339,340],{},"Abrasion"," — wear at the bottom of the bag from falling cake",[79,343,344,347],{},[60,345,346],{},"Thermal degradation"," — exceeding the media's continuous-service rating",[79,349,350,353],{},[60,351,352],{},"Hydrolysis \u002F acid attack"," — at the cold end below the acid dew point",[79,355,356,359],{},[60,357,358],{},"Cage corrosion"," — failure of the cage allows bag collapse",[71,361,131],{"id":130},[76,363,364,369,375,380,384,388],{},[79,365,366],{},[65,367,368],{"href":193},"Fabric filter",[79,370,371],{},[65,372,374],{"href":373},"\u002Fglossary\u002Fbaghouse","Baghouse",[79,376,377],{},[65,378,379],{"href":203},"Bag cage",[79,381,382],{},[65,383,149],{"href":111},[79,385,386],{},[65,387,47],{"href":163},[79,389,390],{},[65,391,334],{"href":333},{"title":151,"searchDepth":152,"depth":152,"links":393},[394,395,396],{"id":208,"depth":152,"text":209},{"id":323,"depth":152,"text":324},{"id":130,"depth":152,"text":131},"A filter bag is the cylindrical fabric sock that traps particulate inside a fabric filter. Bags are typically 120–300 mm in diameter and 2–10 m long, suspended vertically from the tubesheet, supported internally by a wire bag cage and sealed at the top by a snap-band collar.",{},[400,158,401,167,402,403,404],"fabric-filter","bag-cage","fibreglass-filter-bag","p84-nomex-ryton-filter-media","bag-blinding",{"title":406,"description":407},"Filter bag — the cylindrical fabric element of a baghouse","A filter bag is the cylindrical fabric sock that traps particulate inside a fabric filter. Media selection depends on temperature, gas chemistry, dust load and cleaning cycle.",[409],{"title":410,"url":411},"Wikipedia — Baghouse","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBaghouse","glossary\u002Ffilter-bag","c5qm1D9QdtuF4K2dtGAjDJ_qJJmuF0iuEqVTUcRXqww",{"id":415,"title":144,"aliases":416,"body":419,"category":158,"description":522,"extension":160,"meta":523,"navigation":162,"path":67,"relatedTerms":524,"seo":527,"sources":530,"stem":535,"term":144,"__hash__":536},"glossary\u002Fglossary\u002Freverse-air-baghouse.md",[417,418],"reverse air baghouse","RA baghouse",{"type":53,"value":420,"toc":517},[421,430,434,480,484,494,496],[56,422,58,423,426,427,429],{},[60,424,425],{},"reverse-air baghouse"," cleans its ",[65,428,181],{"href":138}," by isolating one compartment at a time from the main gas flow and forcing low-pressure clean air through the bags in the reverse direction. The reverse flow gently collapses the cake from the bag surface, which then falls into the hopper. Reverse-air design is common on coal-fired utility-boiler baghouses and on older industrial installations.",[71,431,433],{"id":432},"strengths-and-weaknesses","Strengths and weaknesses",[223,435,436,446],{},[226,437,438],{},[229,439,440,443],{},[232,441,442],{},"Strength",[232,444,445],{},"Weakness",[242,447,448,456,464,472],{},[229,449,450,453],{},[247,451,452],{},"Gentle cleaning extends bag life",[247,454,455],{},"Compartment must be offline during cleaning",[229,457,458,461],{},[247,459,460],{},"Low compressed-air consumption",[247,462,463],{},"Requires a larger total bag area for the same duty",[229,465,466,469],{},[247,467,468],{},"Tolerates long fibreglass bags",[247,470,471],{},"Slower cleaning cycle",[229,473,474,477],{},[247,475,476],{},"Lower bag wear than pulse-jet",[247,478,479],{},"Cleaning intensity not easily varied",[71,481,483],{"id":482},"where-sonic-horns-help","Where sonic horns help",[56,485,486,487,489,490,221],{},"The gentle nature of reverse-air cleaning leaves residual cake that gradually accumulates over time. ",[65,488,126],{"href":125}," mounted at the compartment roof break up the residual cake without the bag wear of more aggressive primary cleaning, defer the need for offline manual cleaning and reduce average ",[65,491,493],{"href":492},"\u002Fglossary\u002Fdifferential-pressure-baghouse","differential pressure",[71,495,131],{"id":130},[76,497,498,502,506,512],{},[79,499,500],{},[65,501,374],{"href":373},[79,503,504],{},[65,505,139],{"href":138},[79,507,508],{},[65,509,511],{"href":510},"\u002Fglossary\u002Fcompartment-isolation","Compartment isolation",[79,513,514],{},[65,515,516],{"href":125},"Sonic horn",{"title":151,"searchDepth":152,"depth":152,"links":518},[519,520,521],{"id":432,"depth":152,"text":433},{"id":482,"depth":152,"text":483},{"id":130,"depth":152,"text":131},"A reverse-air baghouse cleans its filter bags by isolating one compartment at a time from the main gas flow and forcing low-pressure clean air through the bags in the reverse direction. The reverse flow gently collapses the cake from the bag surface, which then falls into the hopper. Reverse-air design is common on coal-fired utility-boiler baghouses and on older industrial installations.",{},[158,165,525,526],"compartment-isolation","sonic-horn",{"title":528,"description":529},"Reverse-air baghouse — offline compartment cleaning with low-pressure flow","A reverse-air baghouse cleans bags by isolating a compartment and passing low-pressure clean air through the bags in the reverse direction. Common on coal-fired utility duty.",[531,532],{"title":410,"url":411},{"title":533,"url":534},"Neundorfer — Sonic Horns to Enhance RA & Shaker Cleaning","https:\u002F\u002Fwww.neundorfer.com\u002Fknowledge-base\u002Fsonic-horns-to-enhance-ra-shaker-cleaning\u002F","glossary\u002Freverse-air-baghouse","p4ieVvZkXENtxj82QpCOylgn5v4YyCV30-4Gs7cy1JE",{"id":538,"title":149,"aliases":539,"body":543,"category":158,"description":634,"extension":160,"meta":635,"navigation":162,"path":111,"relatedTerms":636,"seo":637,"sources":640,"stem":644,"term":149,"__hash__":645},"glossary\u002Fglossary\u002Fptfe-membrane-filter-bag.md",[540,541,542],"PTFE membrane bag","ePTFE filter bag","Teflon membrane bag",{"type":53,"value":544,"toc":628},[545,559,563,573,577,598,602,608,610],[56,546,58,547,549,550,554,555,558],{},[60,548,149],{}," carries a microporous expanded-polytetrafluoroethylene (ePTFE) membrane laminated to the outside surface of a base felt (usually polyester, P84 or PPS). Particulate is trapped on the membrane surface rather than within the depth of the felt — ",[551,552,553],"em",{},"surface filtration",", also called ",[551,556,557],{},"cake filtration on a membrane",". Outlet particulate of below 1 mg\u002FNm³ is routinely achievable.",[71,560,562],{"id":561},"why-surface-filtration-changes-the-operating-regime","Why surface filtration changes the operating regime",[56,564,565,566,568,569,572],{},"In a conventional depth-filtration bag, particulate gradually loads into the felt itself, raising ",[65,567,493],{"href":492}," over weeks and eventually causing ",[65,570,571],{"href":333},"bag blinding",". A PTFE membrane prevents particulate ingress; cleaning is more complete because the entire cake sits on a non-stick surface; ΔP stabilises quickly after each pulse-jet cycle.",[71,574,576],{"id":575},"where-ptfe-membrane-bags-are-specified","Where PTFE-membrane bags are specified",[76,578,579,586,589,592,595],{},[79,580,581,585],{},[65,582,584],{"href":583},"\u002Fglossary\u002Fwaste-to-energy","Waste-to-energy"," baghouses with strict particulate limits",[79,587,588],{},"Hazardous-waste incineration",[79,590,591],{},"Pharmaceutical and food-grade applications",[79,593,594],{},"Cement bypass baghouses",[79,596,597],{},"Replacements for conventional bags facing tightened emission limits",[71,599,601],{"id":600},"cleaning-compatibility","Cleaning compatibility",[56,603,604,605,607],{},"PTFE-membrane bags tolerate ",[65,606,526],{"href":125}," cleaning without surface damage, provided horns are mounted to project sound across the bag rows rather than directly at any single bag at close range.",[71,609,131],{"id":130},[76,611,612,616,620,624],{},[79,613,614],{},[65,615,139],{"href":138},[79,617,618],{},[65,619,216],{"href":215},[79,621,622],{},[65,623,334],{"href":333},[79,625,626],{},[65,627,516],{"href":125},{"title":151,"searchDepth":152,"depth":152,"links":629},[630,631,632,633],{"id":561,"depth":152,"text":562},{"id":575,"depth":152,"text":576},{"id":600,"depth":152,"text":601},{"id":130,"depth":152,"text":131},"A PTFE-membrane filter bag carries a microporous expanded-polytetrafluoroethylene (ePTFE) membrane laminated to the outside surface of a base felt (usually polyester, P84 or PPS). Particulate is trapped on the membrane surface rather than within the depth of the felt — surface filtration, also called cake filtration on a membrane. Outlet particulate of below 1 mg\u002FNm³ is routinely achievable.",{},[165,403,404,526],{"title":638,"description":639},"PTFE-membrane filter bag — surface filtration for sub-mg particulate","A PTFE-membrane filter bag has a microporous Teflon membrane laminated to the surface of a base felt. Particulate is trapped on the membrane, not within the depth, giving sub-mg outlet performance.",[641],{"title":642,"url":643},"Wikipedia — Polytetrafluoroethylene","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FPolytetrafluoroethylene","glossary\u002Fptfe-membrane-filter-bag","xdkHgDGDp_b3Zu1LKD-pAzJu8fK5YBj49NQ-mU1snOM",1782613721188]