Advancing the Science of Sealing GA R L OC K GY L ON PRODU C TS

GYLON Family HistoryContentsGYLON Family History . i ProductsTypical Physical Properties.2Style 3522.2Style 3591 Gen2 .3Style 3594 Gen2 .3Styles 3500 to 3510.4Thermally Bonded GYLON .4Style 3535 Joint Sealant.4Style 3540.5Style 3545.5Styles HP 3560, HP 3561.6Style 3565 ENVELON .6Style 3575 Sage.7Engineering DataGasket Installation.8M & Y Data.8Gasket Constants.9ASTM F104 Line Callouts.9Sheet Sizes.9When PTFE* was developed in 1938, its importance toindustrial sealing was quickly recognized because of itstremendous chemical resistance. While use of PTFE as agasket material increased in industrial applications, complaints about certain properties started to build: skive marksmade initial sealing difficult, cold flow caused leakage andpremature failure, and temperature/pressure cycling was aproblem.Resistance to Cold Flow (Creep)These drawbacks were eliminated when Garlock introducedFawn GYLON , Style 3500, in 1967. The GYLON processminimizes creep and cold flow normally associated withPTFE products, while retaining other positive characteristicsof PTFE. Fawn GYLON was so innovative that it receivedChemical Processing magazine’s Vaaler Award in 1968. Asthe variety and quantity of industrial chemicals increased,Garlock realized that new products would be required toserve the growing market. Two additional GYLON styleswere introduced to meet those demands: Blue GYLON ,Style 3504, and Off-White GYLON , Style 3510.CompressibilityAs the diversity of applications grew, so did the types ofpiping systems. A large number of exotic piping systemswas required to handle the many hazardous and corrosivechemicals on the market. A common drawback of thesetypes of piping materials is the small amount of gasket loadavailable before the flange is distorted or cracked. In 1989,Garlock responded to this problem by introducing ENVELON , another member of the GYLON family. ENVELON has a soft material on the gasket / flange interface wherecompressibility is important, but has a harder core in themiddle to prevent media permeation and blowout.High Pressure Service, ChemicalCompatibilityGarlockGaskets As production demands increased, pipe hammering and/orpressure spikes became more common. GYLON SeriesHP 3560 and HP 3561 were designed to meet those extreme conditions. These perforated stainless steel-insertedGYLON gasket materials outperform any other gasketingavailable for high pressure service where chemical compatibility is a concern.* PTFE – polytetrafluoroethylenei

Low Bolt Load SealingUnparalleled Reliability and ServiceIn 1994, Garlock introduced GYLON Style 3545 for low boltload applications. It is designed especially to seal pitted,warped or wavy flanges and many non-metallic flanges.Featuring soft, compressible outer layers and a rigid PTFEinner core, Style 3545 is ideal in situations where a rigid gasketis required, such as hard-to-reach piping systems, valves andflanges. The layers of rigid PTFE and microcellular PTFE aresandwiched together using the proprietary GYLON process,rather than adhesives, for longer gasket life. Style 3545 is soinnovative, it received the 1995 Vaaler award from ChemicalProcessing magazine.The Garlock family of GYLON products has evolved overthe years with a focus on quality to meet and exceed customer expectations. The use of Employee Involvement,Statistical Process Control, Vendor Assurance Programs,and a continuous improvement philosophy guarantees endusers the highest quality products available.Unlimited Sizes and DimensionsWith growing concern over fugitive emissions, the traditionaldovetailing method of creating larger sized gaskets no longermeets customer demands. In response, Garlock created theWelded GYLON process. Welded GYLON eliminates dovetail leak paths and allows the use of large gaskets withouthandling problems or premature blowout. Today, GYLON gaskets can be welded to any size or dimension anotherbreakthrough for Garlock gasketing!Testing is performed regularly on all styles and thicknesses toensure the consistency of Garlock quality in GYLON sheets.Quality American-made products, 41 years of experience,on-time delivery and value-added service programs, all arereasons why the GYLON family of products has becomesuch a major sealing component in industry today.There is no doubt that demands will change in the future. Butone thing is certain—Garlock will continue to answer thosechanges and demands with products that are innovative andtimely. GYLON , a name you can trust and a complete familyof products to choose from for your gasketing needs.1

GYLON Gasketing Typical Physical Properties*GYLON Styles35003504351035223540 ColorFawn GYLON Blue GYLONOff-whiteGYLONWhiteGYLON DiaphragmGYLON CompositionPTFE withPTFE withPTFE eressulfateTemperature1 Minimum-450 F-450 F-450 F-450 F(-268 C)(-268 C)(-268 C) 500 F(-268 C)Cont. max. 500 F 500 F 500 F( 260 C) 500 F( 260 C)( 260 C)( 260 C)( 260 C)Pressure,psig1,2008001,200Consult1,200Cont. max.1 (bar)(83)(55)(83)Engineering(83)1P x T, max. 1/32", 1/16"350,000350,000350,000350,000(0.8 mm,1.6 mm)(12,000)(12,000)(12,000)—(12,000)psig x F 1/8"250,000250,000250,000250,000(bar x C) (3.2 mm)(8,600)(8,600)(8,600)(8,600)SealabilityASTM Fuel A ml/hr0.220.120.04—0.25(ASTM F37B)3 0.015 0.015 0.015— 0.015Gas Permeability cc/min.(DIN 3535 Part 4)4Creep Relaxation%1840113510(ASTM F38)Compressibility Range(ASTM F36)%7-1225-454-1020-2570-85Recovery% 40 30 40 50 8(ASTM F36)Tensile (ASTM D1708) (N/mm2)FlammabilityWill not support flameBacterial GrowthWill not supportNotes:1234Based on ANSI RF flanges at our preferred torque. When approachingmaximum pressure, temperature or 50% of maximum PxT, consultGarlock Engineering. For Styles HP 3560 and HP 3561, consultGarlock if approaching maximum temperature, or 50% of maximumpressure or P x T.For 3565, HP 3560 and HP 3561, 1/16" thickness only; for 3535,1/4" thickness only.ASTM F37B Sealability, milliliters/hour (1/32" thick)ASTM Fuel A (isooctane):Gasket load 1,000 psi (7 N/mm2),Internal pressure 9.8 psig (0.7 bar)DIN 3535 Part 4 Gas Permeability, cc/min. (1/16" thick)Nitrogen: Internal pressure 580 psig (40 bar),Gasket load 4,640 psi (32 N/mm2)3545WhiteGYLON MicrocellularPTFE-450 F(-268 C) 500 F( 260 C)1,200(83)350,000(12,000)250,000(8,600)0.15 0.0151560-70 15—This is a general guide and should not be the sole means of selectingor rejecting this material. ASTM test results in accordance with ASTMF-104; properties based on 1/32" (0.8mm) sheet thickness, except Style 3565,based on 1/16" (1.6mm).* Values do not constitute specification limitsWARNING:Properties/applications shown throughout this brochure are typical. Your specific application should not be undertaken without independent study and evaluation for suitability. Forspecific application recommendations consult Garlock. Failure to select the proper sealingproducts could result in property damage and/or serious personal injury.Performance data published in this brochure has been developed from field testing, customerfield reports and/or in-house testing.While the utmost care has been used in compiling this brochure, we assume no responsibility for errors. Specifications subject to change without notice. This edition cancels allprevious issues. Subject to change without notice.GARLOCK is a registered trademark for packings, seals, gaskets, and other productsof Garlock.2

HP 3560Fawn insertedGYLON GYLON withperforated316LSS insert—— 500 F( 260 35913594 Off-white inserted ENVELONSageGold Gen2 Green Gen2 GYLON GYLON GYLON GYLON GYLON GYLON withPTFE withPTFE withPTFE withPTFE withperforatedglassinorganic filler barium sulfate glass filler316LSS insertmicrospheres—-450 F-450 F-450 F-450 F—(-268 C)(-268 C)(-268 C)(-268 C) 500 F 500 F 500 F 500 F 500 F( 260 C)( 260 C)( 260 C)( 260 C)( 260 50,000(15,000)(8,600)(8,600)(8,600)(8,600)0.2 2 0.0152HP 35610.120.3320.220.200.50 0.0152 0.0152 0.0152 0.015 0.01520220235215235304-92 4523-72 50235-502 3525-102 40215-25 4010-20 455,00025,00021,80022,0002(34)(34)(13)(14)Will not support flameWill not support2,000(14)2,000(14) GarlockGasketsQuestions? Call GasketApplications Engineering at1-800-448-6688.Test DataBeforeCompression at 2,000 psi (14 N/mm2)for 1 hour at 500 F (260 C)AfterNote the uneven cold flowshown by conventional PTFE.Style 3510Off-WhiteStyle 3504BlueStyle 3500FawnConventionalPTFE3

GYLONStyles 3500 to 3510 BenefitsTighter seal Improved performance over conventional PTFEReduced product loss and emissionsThermally Bonded GYLON BenefitsEffective seal Reduced creep relaxation Unique manufacturing process minimizes cold flow problems typical of skived and expanded PTFE sheetsExcellent bolt torque retentionVersatile Chemical resistance Withstands a wide range of chemicals for extended servicelife in a wide variety of applicationsCost savings Cuts operational costs through reduced: Fluid loss Inventory costs Energy consumption Waste Maintenance costsPatented bonding process produces large gaskets withoutdovetailed joints that permit leakageGYLON material provides the excellent chemical resistance of PTFE without creep relaxation and cold flowproblemsIdeal for corrosive applications with extra-large flangesStyles 3500, 3504, 3510, 3540, HP 3560, HP 3561,3565, 3575, 3591 and 3594 can all be welded using thisprocessStyle 3535 Joint SealantBenefitsLargest sheet sizes*Chemical resistance Offers some of the largest sheet sizes in the industryImproved material utilization reduces wasteBranding and color coding *Easy identification of superior GYLON productsReduces misapplication and use of unauthorized,inferior substitutes60" x 60" (1524 mm x 1524 mm), 70" x 70" (1778 mm x 1778 mm),60" x 90" (1524 mm x 2286 mm)MediaGYLON 3500: Strong acids (except hydrofluoric), solvents,hydrocarbons, water, steam, chlorine, andcryogenics. Conforms to FDA regulations.(For oxygen service, specify "Style 3502for oxygen service.")GYLON 3504: Moderate concentrations of acids and somecaustics, hydrocarbons, solvents, water,refrigerants, and cryogenics. Conforms toFDA regulations. (For oxygen service,specify "Style 3505 for oxygen service.")4GYLON 3510: Strong caustics, moderate acids, chlorine,gases, water, steam, hydrocarbons, andcryogenics. Conforms to FDA regulations.(For oxygen service, specify "Style 3503for oxygen service.") Pure PTFE is chemically inert, withstands a widerange of chemicalsConforms to FDA regulationsEasy to install Continuous length on spools is easily cut and formedStrong adhesive backing aids installation on narrow orhard-to-reach flangesAvailable in widths from 1/8" to 1"Typical Physical PropertiesSealability(ASTM F37B)1ml/hr0.1Gas Permeability (DIN 3535 Part 4)2 cc/min.0.05Temperature-450ºF (-268ºC) to 500ºF (260ºC)Pressure800 psig max.Notes:12ASTM F37B Sealability, milliliters/hour (1/4" thick)ASTM Fuel A (isooctane):Gasket load: 3,000 psi (20.7 N/mm2), Internal pressure: 30 psig (2 bar)DIN 3535 Part 4 Gas Permeability, cc/min. (1/4" thick)Nitrogen:Internal pressure: 580 psig (40 bar), Gasket load: 4,640 psi (32 N/mm2)

GYLON Style 3545Configuration WINNERBenefitsChemical Processing’sVAALER AWARDMicrocellularPTFETighter sealHighly compressible PTFE outer layers seal under lowbolt load—suitable for many flat face and glass-linedflanges*Compressible layers conform to surface irregularities,especially on warped, pitted or scratched flangesRigid PTFE core reduces cold flow and creep normallyassociated with conventional PTFE gaskets Rigid PTFEMicrocellularPTFEExcellent chemical compatibilityPure PTFE withstands a wide range of chemicals Cross-sectional view under electron microscopeAll layers manufactured using proprietary GYLON process—thermally fused layers, without the use ofadhesivesEasy to cut and installSoft PTFE can be cut easily from larger sheets, reducinginventory costs and expensive downtimeRigid PTFE core facilitates installation, especially on largediameter flanges and hard-to-reach areas MediaGYLON 3540:GYLON Style 3540 GYLON 3545:Pure microcellular PTFESimilar to Style 3545, but without rigid coreIdeal for wavy, warped, pitted, or scratchedflanges, and for many types of flat face flanges*Strong caustics, strong acids, hydrocarbons, chlorine, and cryogenics.Conforms to FDA regulations.Strong caustics, strong acids, hydrocarbons, chlorine, cryogenics andglass-lined equipment. Conforms to FDAregulations.DIN 52913 Gasket Bolt Load vs. TimeBolt Load Retained – psi (bar)Test ResultsDIN 3535 Gasket Permeation TestLeak Rate PTFEGYLON3540 GYLON3545 Note the dramatically reduced leakage of GYLON 3540 and 3545.Average of three tests, using 580 psig nitrogen with 4,640 psi gasketload according to DIN 3535 requirements. All samples 1/16" (1.6 10.5)0024681012Hours at 500 F (260 C)1416GYLON 3540Expanded PTFEGYLON 3545Skived PTFEHigh bolt load retention of GYLON 3540 and 3545, especially at high temperatures, indicates gasket is less likely to incur gross leakage (blowout).*For flat face flanges, a minimum compressive stress of 1,500psi (103 N/mm2) is recommended on the contacted gasket areafor 150 psig (10.3 N/mm2) liquid service. Consult with the flangemanufacturer to confirm that adequate compressive stress isavailable.5

GYLON StylesHP 3560 / HP 3561 BenefitsTight seal Perforated stainless steel core increases resistance topressure fluctuations and thermal cyclingGYLON offers superior cold flow and creep resistance,eliminating the need for frequent retorquingMediaHP 3560:Strong acids (except hydrofluoric),solvents, hydrocarbons, water, steam,chlorine, and cryogenics(For oxygen service, specify "HP 3562for oxygen service.")HP 3561:Strong caustics, moderate acids,chlorine, gases, water, steam, hydrocarbons, and cryogenic(For oxygen service, specify "HP 3563for oxygen service.")Style 3565:ENVELON Moderate concentrations of acidsand caustics, hydrocarbons, solvents,cryogenics, and glass-lined equipment.Conforms to FDA regulations.Chemical resistance Seals aggressive chemicals in hostile environmentswhere safety or blowout resistance is crucial*GYLON Style 3565ENVELON Gasketing** BenefitsTighter seal Soft, deformable exterior conforms to surface irregularities; ideal for worn, warped or pitted flangesStable blue core improves cold flow resistanceLow bolt load requirements ensure a tight seal on glasslined or wavy flanges †Direct sintering of GYLON layers prevents leak pathsand adhesive contaminationEasy to install Unitized construction avoids jacket foldoverRigid core facilitates installation of large gasketsMinimizes inventory Custom-cut gaskets from large sheets offer conveniencewhile reducing costly inventory buildupIdeal replacement for slit, milled, formed shield anddouble jacketed envelope gaskets †* Consult Garlock Applications Engineering when using flanges inpressure classes above 300 lbs.** Patents #4,961,891; #4,900,629†When sealing uneven flanges, gasket must be four times thickerthan maximum gap between flanges.6WARNING:Properties/applications shown throughout this brochure are typical. Your specific applicationshould not be undertaken without independent study and evaluation for suitability. For specificapplication recommendations consult Garlock. Failure to select the proper sealing productscould result in property damage and/or serious personal injury.Performance data published in this brochure has been developed from field testing, customerfield reports and/or in-house testing.While the utmost care has been used in compiling this brochure, we assume no responsibilityfor errors. Specifications subject to change without notice. This edition cancels all previousissues. Subject to change without notice.GARLOCK is a registered trademark for packings, seals, gaskets, and other products ofGarlock.

Sage GYLON Style 3575 The next level in high performancePTFE gasketing.For over 40 years GYLON has been the material of choicefor the chemical process industry. And now we’ve addeda brand new product to the GYLON portfolio. Reliableand durable Sage GYLON gaskets are made from a highperforming PTFE material that will hold up to the hazardouschemicals that you work with every day.Benefits Improved load retention provides prolonged service lifein thermal cycling applicationsExcellent permeation resistance means reducedprocess emissionsSuperior chemical resistanceMade to order in any size (including thermally bondedgaskets)Available in 1/16" and 1/8" thicknessesHOBT2 Test with Cycles (1/16”)MediaStrong acids, strong caustics, aromatic and aliphatichydrocarbons, heat transfer fluids, steam and refrigerants(See pages 8 and 9 for design factors, ROTT gasket constants & ASTMF104 line callout)Hot Compression @ 500ºF, 3750 psi (1/16”)GarlockGasketsQuestions? Call GasketApplications Engineeringat 1-800-448-6688.7

Before Installation"M" and "Y" Data Remove old gasket, and clean flange surface of all debris.For best results, use a metal flange scraper, an aerosolgasket remover and a wire brush, then inspect the flangefor damage. Be sure surface finish and flatness are satisfactory."M" and "Y" data are to be used for flange designs only asspecified in the ASME Boiler and Pressure Vessel CodeDivision 1, Section VIII, Appendix 2. They are not meant tobe used as gasket seating stress values in actual service.Our bolt torque tables give that information and should beused as such. Use the thinnest possible gasket. However, flanges thatare warped, bowed or severely pitted require thickergaskets. Whenever possible, use ring gaskets. Full face gasketshave more surface area, requiring additional compressiveload on the gasket.   Use dry anti-seize, rather than wet. Talc is best, whilegraphite and mica are also acceptable. Never use metalbased anti-seize, since particles may accumulate in thesurface imperfections, thereby creating a flange surfacethat is too smooth to be effective.Installation   Center the gasket on the flange. This is extremelyvital where raised faces are involved.Note: Standard ANSI ring gaskets, when properly cut,should center themselves when the bolts are in place.   Use a torque wrench and well-lubricated fasteners withhardened flat washers to ensure correct initial loading.   Tighten bolts to compress gasket uniformly. This meansgoing from side to side around the joint in a star-likecrossing pattern. See Figure 3 below.   All bolts should be tightened in one-third increments,according to proper bolting patterns.   Retorque 12 to 24 hours after start-up, whenever possible.All applicable safety standards including lockout/tagoutprocedure should be observed.   Never use liquid or metallic based anti-stick or lubricatingcompounds on the gaskets. Premature failure could occuras a result.Figur