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USHO 003062 Arms t rung gasket materials ~czzz:-.z asoestos noer) oages A and 5 itddcso -lose hber) pages 5 and 7 'ar-. h^a-'-jODe'' compositions pages 8 thru 11 Z:'* compositions pages 12 and 13 ; osed ''c-ci'ei'-; rubber page 14 = -boer ':mpo.."as page 15 '-s- -i ~sz~' 3 page 15 =es e-" ' r c-1 -- acsr-ais page 17 o--r:':r :~r" pages IS arc 19 CJSHO 003063 E"ec; .e sea 5 at mg lowest cost are best obtained when the s-ged ,o<r- ?.-z the gasket are considered as a unit m tne aes g- srage '-is true because design factors such as bolt pads. oc:t soap rig. flange rigidity, operating temperature, anp -Cange s-ir-sce -'-nish all affect the sealing performance r --e gasKet Veto's such as the possible effect of contained "Uids environmental effects, and economic considerations aiso enter ntc me task of selecting the right material. Armstrong Materials To --set me .voe range of industry requirements. Armstrong ->3s deveooeo se.-eral classes of resilient gasket materials "-'ese n: uce --e Accopac line of asbestos and cellulose uber j-eets cor<-ano ruooercompositions. cork compositions, anc s.-tnor.p occer -m-aterials. including cellular types. A.thm these ma.or classes there are a number of individual nj-ai a s. eac- * -,h different characteristics or offering some spec a des go .iC-rsntage. Descriptive information and br.e-' data :c :-'='?:`enstics of each are included in this catalog. JK, Here are just a few of many devices used for simulated serv ice testing and physical testing of Armstrong gasket materials. A--Glass flange apparatus permits visual observation through ports of sealing performance of gasket materials under internal pressures from zero to 100 psi. 8--Deflectometer detects and measures flange deflections resulting from internal pressure. C--Electro-mechanical device tests efficiency of gas or liquid seals at internal pressures up to 100 psi. Unit detects leakage, and with associated equipment measures and records it as a function of time. D--Dilatometer developed by Armstrong research allows precise measurement of dimensional change in sheet gasket materials. Armstrong Engineering Research Because flange design and operating conditions affect sealing performance, extensive physical and simulated service testing is a continuous part of Armstrong gasket research. This includes study of factors such as operating temperatures, torque retention problems, flange metals, flange finishes, contained fluids, environmental conditions, and interactions of these factors that might affect sealing. Much of this engineering information is summarized in the Armstrong Gasket and Flange Design Manual. A copy of this manual will be sent on request. Send your request to the address at the right, or contact your nearest Industry Prod ucts Division office. These are listed on the back cover. Armstrong Approved Fabricators Before setting final specifications, we suggest you call your Armstrong Approved Fabricator. He may be able to suggest design features that may help you achieve a more effective 3 or more economical seal. And he'll provide test samples of recommended materials. All Armstrong gasket materials are available through Arm strong Approved Fabricators. This nationwide network of 100 independent businesses offers you the advantages of a local supplier: convenient, personal contact: fast service: and prompt delivery of large or small quantities. Armstrong fabricators have modern equipment for precision fabrication. They can provide you with data for each Arm strong material and help you in specific selection problems. When you have unusual sealing conditions, your Approved Fabricator can call on the services of the Armstrong Industry Products representative in your area, and through him, the staff of the Armstrong Research and Development Center. You'll want the extra values that are yours when you deal with your Armstrong Approved Fabricator. Write to us for a list of their locations. Armstrong Cork Company. Industry Products Division, Lancaster, Penna. Armstrong Accopac gasket materials asbestos fiber BRIEF DATA/ACCOPAC ASBESTOS FIBER MATERIALS TYPE COMPOSITION CHARACTERISTICS AS-428 AD-838 AN-859 Asbestos, styrene-butadiene rubber (SBR) Asbestos, nitrile-chloroprene rubber (NCR) Highly compressible asbestos sheets for moderate to heavy-duty service at elevated temperatures. Asbestos, nitrile-butadiene rubber (NBR) % COMPRESSIBILITY (1000 PSI)* 17-27 17-27 17-27 AS-460 AD-870 AN-890 Asbestos, styrene-butadiene rubber (S8R) Asbestos, nitrile-chloroprene rubber (NCR) Asbestos sheets with outstanding sealing characteristics: for service at elevated temperatures. AD-870 and AN-890 are Underwriters' Approved. Asbestos, nitrile-butadiene rubber (NBR) 12-20 12-20 12-20 AN-892 Asbestos, nitrile-butadiene rubber (NBR) Combines high density with flexibility and conformability with low compressibility. For heavy-duty service at elevated temperatures. Forms and sizes Accopac materials are supplied in roll and sheet form in a variety of gauges. Die-cut parts available only from Armstrong Approved Fabricators. 5-15 General Properties Accopac materials are unique among asbestos gasket com pounds. They are uniform and homogeneous, tough and flexible, easy to handle even in thinnest gauges. These unusual characteristics are the result of the way Acco pac asbestos sheets are made. In this Armstrong-patented process, the asbestos fibers are refined to eliminate all lumps and bunches. They are then coated uniformly with a latex rubber binder. The composition of Accopac asbestos materials is indicated by prefix code letters as follows: A--asbestos fiber D--nitrile-chloroprene rubber S--styrene-butadiene rubber N--nitrile-butadiene rubber Design Advantages Uniformity The Armstrong process produces an unusually uniform asbestos sheet because it eliminates clusters of fibers. This eliminates leakage caused by wicking. Uniformity also results in clean die-cutting, without loose fibers to be come detached and contaminate fluids. Economy Accopac asbestos compositions cost from 15% to 30% less than conventional compressed asbestos materials. In addition, the absence of bunched fibers sometimes makes it possible to use thinner gauges of Accopac than would be possible with other asbestos sheets. 4 USHO 003065 % COMPRESSIBILITY (5000 PSI)0 TENSILE STRENGTH MINIMUM PSI CURVE * 30-40 1300 A 30-40 1400 A 30-40 1600 A 20-30 1600 B 20-30 i^ 20-30 - 1700 2000 B B DYNAMIC LOAD COMPRESSION CURVES Curves are typical; variations can be expected In practice. Dynamic values may not agree with values shown in chart at left because of difference in test methods. Test samples: 1 sq in disc x lhi" thickness. 60 40 c o a o 10-17 3000 Tested per ASTM F36 61T (formerly 01147 61 Tl C Compressibility In general, Accopac asbestos materials are more compressible than other asbestos compositions. This is a design advantage in those cases where compressibility may permit lower bolt loads. Sealing Characteristics Asbestos materials have generally higher seal points than other resilient gasket compositions. The seal point for Acco pac asbestos sheets ranges from 1500 psi to about 2500 psi, depending on the composition. Accopac asbestos materials usually will readily conform to and compensate for minor imperfections in flanges. Environmental Considerations Temperature Accopac asbestos compositions are designed for moderate to heavy-duty service and have been used at temperatures up to 800F. Contained fluids Accopac asbestos materials are recom mended for sealing the same fluids as are sealed by con ventional asbestos materials. (See the selector chart on pages 18 and 19.) Flange No agents that will stain or corrode flanges are con tained in Accopac asbestos compositions. External These materials are resistant to fungi, moisture, and related conditions of exposure. USHO 003066 5 (Xfmstrong Accopac gasket materials cellulose fiber ^ BRIEF DATA/ACCOPAC CELLULOSE FIBER MATERIALS TYPE COMPOSITION CHARACTERISTICS AND USES CS-301 Cellulose fiber, cork, and styrenebutadiene rubber (S8R) A dependable seal in water and high aniline point oil and in other services not involving aromatic fuels and certain solvents: Underwriters' Approved. CN-705 Cellulose fiber, cork, and nitrile-butadiene Generally suitable for oil. gasoline, and water services; Underwriters' Approved. rubber (NBR) CN-888 Cellulose fiber, cork, and nitrile-butadiene rubber (NBR) A pre compressed material generally suitable for oil, gasoline, gas and water services at normal temperatures: seals at bolt pressures as low as 800 psi. Underwriters' Approved. N-820 Cellulose fiber and nitrile-butadiene rubber (NBR) Formulated specifically for heavy-duty flange pressures at elevated temperatures. N-840 Cellulose fiber and nitrile-butadiene rubber (NBR) A tough, oil-resistant material having excellent sealing ability at medium flange loads. Underwriters' Approved. N-852 Cellulose fiber and blend of synthetic rubbers Low cost, moderate oil-resistant gasket material for medium to heavy-duty flange pressures. RN-8011 Cellulose fiber and nitrile-butadiene rubber Highly compressible with high rubber content providing excellent sealing of water and oil at low flange loads RS-464 Cellulose fiber, styrene-butadiene rubber (SBR) Low cost, highly compressible material with high rubber content provides excellent sealing of pressurized water at low flange loads. Forms and sizes Accopac materials are supplied in roll and sheet form in a variety of gauges. Die-cut parts available only from Armstrong Approved Fabricators. General Properties Accopac cellulose fiber gasket materials are made by a pat ented Armstrong process which produces sheets with unusual uniformity, flexibility, dimensional stability, and ease of handling. In this process, each fiber is coated with a latex binder before the sheet is formed. This produces a much more uniform binder-fiber structure than is possible with methods that add the binder by dip saturation or coating. As a result of this manufacturing technique, the binders in Accopac materials are not leached out by the action of con tained fluids in any recommended application. The composition of Accopac cellulose materials is indicated by prefix code letters as follows: C--cork N--nitrile-butadiene rubber S--styrene-butadiene rubber Design Advantages Dimensional stability Accopac gaskets will not change size appreciably--in the flange or in storage. This stability stems from the latex binders in Accopac. The binders will not be driven off by heat or evaporated by aging; nor will they attract moisture from the atmosphere. Wide range Accopac cellulose fiber sheets offer designers a variety of physical characteristics that offer efficient, econom ical solutions to any fiber gasket problem. The line includes dense, extrusion-resistant sheets for heavy-duty installations as well as lighter, more compressible materials for general purpose use. USHO 003067 6 - COMPRESSIBILITY (1000 PSI)* 30-45 TENSILE STRENGTH MINIMUM PSI 700 CURVE B 30-45 800 B DYNAMIC LOAD COMPRESSION CURVES Curves are typical; variations can be expected in practice. Dynamic values may not agree with values shown in chart at left because of difference in test methods. Test samples: 1 sq in disc x VSj" thickness. 80 12-30 1200 10-20 2700 5-15 '*W 17-27 3000 1600 40-60 220 40-60 220 rested per ASTM F36 61T (formerly DI147 61T) C D E C A A 60 A Economy Accopac cellulose fiber materials offer the double economy of relatively low initial cost and long service life. Sealing Characteristics Fiber gasket materials are not essentially impervious in their uncompressed state. They usually require somewhat higher flange loads than other resilient gasket materials. The seal point for most Accopac cellulose gaskets ranges from 800 psi to 2000 psi. Much higher loads, required by some applications, will not cause crushing or extrusion of Accopac. Environmental Considerations Temperature Cellulose fiber Accopac sheets will seal effectively at temperatures up to 300F. This is a higher limit than that recommended for conventionally saturated fiber sheets whose saturants are often adversely affected by temperatures in this range. Contained fluids The resistance of various Accopac cellulose sheets varies with the type of rubber binder. General recom mendations are contained in the selector chart on pages 18-19. Flange Accopac materials have no ingredients that will tend to corrode flanges, and their nonhygroscopic binders will not encourage electrolytic corrosion where dissimilar metals are joined. USHO 003068 7 (Armstrong gasket materials cork-and-rubber BRIEF DATA/CORK'AND-SYNTHETIC RUBBER COMPOSITIONS TYPE CHARACTERISTICS AND USES SPECIFIC GRAVITY SHORE TYPE A HARDNESS % COMPRESSIBILITY' DC-100 DC-113 CCEJ DC-118 Ui Oc0zcJ. DC-167 o<r o_ X o DC-179 General purpose gasket and sealing material: high cork content, minimum side flow. Firmer than DC-100; high cork content: for narrow gaskets, instrument bezels, etc. More rubbery material: used where toughness and some side flow are required. Top-quality, soft, highly compressible material for low bolting pressures. Low cost, highly compressible material similar to DC-167. CO0 1 too 55-70 ,89-.97 70-85 1.20-1.30 65-75 .70-.78 40-55 .60-.70 50-65 DC-181 Top quality, slightly firmer than DC-167. DC-199 Low cost, highly compressible material for general purpose applications. NC-478 ST CO z NC-709 lit zLU o NC-710 2) m LlI Ct-E NC-711 z An economical, resilient, oil-resistant stock for general purpose applications. Soft, highly compressible; for low bolting pressures; maximum oil, solvent resistance. Like DC-100, but with maximum oil. solvent resistance: Underwriters' Approved. Like DC-113, but with maximum resistance to oil. solvents; Underwriters' Approved. NC-757 Low cost, highly compressible material similar to NC-709. .70-.78 50-65 .80-1.00 55-70 .45-.60 30-40 .65-. 75 40-55 .80-.90 55-70 .95-1.05 70-85 .50-.60 55-70 20-30 (300 psi) 10-20 (300 psi) 5-15 (300 psi) 30-40 (200 psi) 30-45 (200 psi) 30-40 (300 psi) 30-45"' (400 psi) 35-50-` ICO OS,l 30-40 1.200 psij 20-30 (300 psi) 10-20 (300 psi) 25-45 (200 psi) w Forms and sizes Sheet size 36" x 36". Thicknesses: !4<" to y*". Lathe-cut rings %" I.D. to 20" O.D. can be cut from DC-100, DC-113. DC-118, DC-167, NC-710. and NC-711. All materials also available in ribbon form. Die-cut parts available only from Armstrong Approved Fabricators. General Properties Armstrong cork-and-rubber materials offer many of the ad vantages of synthetic rubber compounds, with the important additional property of controlled compressibility. Thus, cork-and-rubber gaskets can often be used in place of straight rubber in applications where the tendency of straight rubber to side flow would be objectionable. By careful compounding of compressible cork particles in vari ous ratios with noncompressible rubber stocks, Armstrong produces a group of materials with a wide range of firmness. With these manufacturing techniques, it is possible to pro duce combinations that are nearly as compressible as cork, or almost as noncompressible as straight rubber. Unsponged cork-and-rubber compounds will compress from 20% to 33% without excessive side flow. The code letters which prefix numbers of Armstrong cork-andrubber compounds can be read as follows: D--chloroprene N--nitrile-butadiene R--styrene-butadiene Y--butyl L--silicone C--cork K--sponged, containing cork * USHO 003069 SPECIFICATIONS^ ASTM D1170-62T. SAE J90 MIL-C-6183A. TYPE I CURVE P-2255A P-2254A Class 2 Medium Class 2 Firm c G F P-2256A Class 2 Soft B P-2255B B B DYNAMIC LOAD COMPRESSION CURVES Curves are typical; variations can be expected in practice. Dynamic values may not agree with values shown in chart at left because of difference in test methods. Test samples: 6" x 1" x Is". 80 P-2246A P-2245A P-2243A Class 1 Soft Class I Medium Class 1 Firm B C G P-2245B _ B Tested according to procedure of MIL-C6I83 A. t Armstrong materials indicated here are made to meet the listed specifications. Data in this chart based on sheet stock materials. Testedaccording to procedure B. ASTM F36-61T(formerly ASTM D1147-61T). Tested according to procedure F. ASTM F36 61T (formerly ASTM D1147-61T). Design Advantages No side flow Cork-and-rubber materials are especially useful in metal-to-metal joints where the gasket fits into a groove machined into one flange. No allowance need be made for side flow if cork-and-rubber material of the proper firmness is selected. In addition, the controlled compressibility of cork-and-rubber sometimes makes possible wider tolerances in the metal members. In many cases, lathe-cut cork-and-rubber rings can be used in place of more expensive noncompressible molded rubber O-rings. High friction The frictional properties of cork are retained in cork-and-rubber compounds and help to reduce extrusion or slippage of the gaskets. Conformability Cork-and-rubber stocks, including the sponged materials, will easily conform to and compensate for minor flange irregularities. This characteristic is especially useful in stamped or other lightweight assemblies where the available bolt load is usually low. CONTINUED NEXT PAGE 9 Armstrong USHO 003070 gasket materials cork-and-rubber continued TYPE SYNTHETIC RUBBER BASE CHARACTERISTICS AND USES SPECIFIC GRAVITY SHORE TYPE A HARONESS LC-800 Silicone (Si) Remains flexible and resilient over wide range of temperatures. Good electrical characteristics. .95-1.10 65-75 OK-149 Sponged chloroprene (CR) Highly compressible, resists fatigue: for cushion pads, low bolt pressure gaskets. .43-.53 35-50 NK-730 Sponged nitr/le-butadiene (NBR) Similar to DK-149 but with maximum resistance to oils, solvents, aromatic fuels. .46-.56 30-50 RK-374SGM Sponged styrene-buta diene (SBR) Low cost, highly compressible. For automotive tail lamps and non-solvent uses: gray color. .40-.50 35-50 YK-950 Sponged butyl (HR) Butyl-cork sponged material for automotive lamp gaskets: excellent resistance to ozone and moisture; gray color; highly compressible. .40-.55 20-35 YC-900 Butyl (IIR) Top-quality gasket material with high resistance to nonflam mable hydraulic fluids and high-temperature lubricants. .72-.82 50-60 #> Forms and sizes Sheet size 36" x 36". Thicknesses: I'm" to Lathe-cut rings W I.D. to 20" O.D. can be cut from DC-100. DC-113, DC-118, DC-167, NC-710, and NC-7I1. All materials also available in ribbon form. Die-cut parts available only from Armstrong Approved Fabricators. Fatigue resistance Cork-and-rubber compounds have un usual resilience which helps to provide resistance to compres sion set and other effects of fatigue. They are ideal for appli cations such as access doors and hatch covers where the gasket is subject to frequent opening and resealing. Corkand-rubber gaskets are more resistant to aging than their straight rubber counterparts. Sealing Characteristics Unsponged cork-and-rubber compounds are essentially im pervious because rubber is the continuous phase of the material. This means that all of the available unit loading can be used to establish and maintain intimate contact of the gasket to the flange. The seal points of cork-and-rubber materials are generally among the lowest of all resilient gaskets. Environmental Considerations Temperature In general, Armstrong cork-and-rubber mate rials are suggested for use where temperatures range from -20F to 250F. This range can be widened for Armstrong LC-800, which has a silicone rubber base that permits serv- 10 USHO 003071 *o COMPRESSIBILITY SPECIFICATIONS! ASTM DU70-62T& SAE J90 CURVE DYNAMIC LOAD COMPRESSION CURVES 1 15-25" (400 psi) Curves are typical; variations can be expected in practice. Dynamic values may not agree with values shown in chart at left because of difference in test methods. G Test samples: 6" x 1" x '6''. 35-50* (100 psi) P-2357A 80 -------------------------------------------------------------------------------------------------------A A 35-50** (100 psi) P-2347A A 35-50** (100 psi) P-2367A A 1| 25-40*"" (40 psi) 25-40* (300 psi) - A D Tested according to procedure of MH-C6183A "Tested according to Procedure F, ASTM F36 6IT (formerly 0114761T). Tested with 1.129" diameter penetrator at total toad of 40 pounds. fArmstrong materials indicated here are made to meet the listed specifications. Data m this chart based on sheet stock materials. ice from -65F to approximately 300 F. Arbitrary temperature limits, particularly on the high side, cannot be set. In any doubtful case, consult your Armstrong Approved Fabricator or nearest Industry Products Division office. Contained fluids Cork-and-rubber compositions have resist ance to fluids comparable to the specific rubber on which they are based. Thus, chloroprene rubber (CR) is normally used with lubri cating oils and for general purpose applications where some swell is desired or can be tolerated. Nitrile-butadiene rubber (NBR) has excellent resistance to high-swell oils and good resistance to gasoline and aromatic solvents. Butyl rubbers (MR) provide excellent sealing of nonflammable hydraulic fluids. Cork-and-rubber materials should not be used to seal acids and bases, because these will attack or degrade the cork particles. USHO 003072 n {^rnstrong gasket materials cork compositions BRIEF DATA/CORK COMPOSITIONS COMPOSITION CHARACTERISTICS ANO USES 9520 Extra compressible; for glass-to-metal and other light-duty services: resin-bonded equivalent is 507. 9530 This is the most widely used Armstrong cork gasket material: for automotive and similar services: resin-bonded equivalent is 514. 9540 Firmer than 9530: for oil seals. Underwriters' Approved. 9540-BN: resin-bonded equivalent is 523. 9550 Heavy-duty material for oil seal service; Underwriters' Approved. 9550-BN: resin-bonded equivalent is 539. 1155 612 More dense than 9550: oil seal and similar service: frequently employed for parts of complicated design involving thin sections. Special-purpose extra-conformable composition combining good sealing characteristics with structural imperviousness: made especially for sealing under low flange pressures. IS 7018 7051 Both materials recommended for use where unusual conformity to flanges is required for sealing. Particularly effective in sealing light-duty, low-load flanges or flanges where high bolt pressures might damage assembly. Highly resistant to fungus growth. Underwriters* Approved. Forms and sizes Sheets: up to 28" x 50". Thicknesses: Yu" and over as specified. Custom-made parts-- die-cut and machine shaped. SPECIFICATIONS ASTM D1170-62Tt and SAE J90t Armstrong designation P-2116A 9550 HH-C-576b MIL-G-12803A (ORD) 24 May 1960 t *4" to XA" thickness. Class 3 9550 FT P-2117A P-2117B 9540 9530 Type 1 Class 2 9540 FT 9530 FT P-2118A 9520 Class 1 9520 FT P-2126A 539 Class 3 539 FT P-2127A P-2127B 523 514 Type II Class 2 523 FT 514 FT P-2128A 507 Class 1 507 FT General Properties The wide range of physical properties offered by Armstrong cork compositions makes them among the most versatile and widely used resilient gasket materials. The outstanding feature of cork gaskets is their unique microcellular or fine foam structure, which accounts for several important gasketing properties. These include high compres sibility, unusual crush resistance, high friction, a high degree of impermeability under relatively low flange loads. Compressibility The true compressibility of cork materials makes possible substantial deflections with negligible side flow. They are ideal for confined applications where no relief for side flow can be provided. High friction Cork has inherently high friction. This helps to prevent slippage or extrusion of cork gaskets and is of par ticular importance where flanges are oily. Economy Cork compositions are among the least expensive of the efficient soft gasketing materials. Sealing Characteristics Cork compositions become essentially impermeable at flange pressures of from 400 psi to 1200 psi, depending on their 12 USHO 003073 % COMPRESSIBILITY (100 PSI)* MINIMUM DENSITY LB PER CU FT - 30-50 14 ' 20-40 17 - 15-30 20 ' 10-25 24 5-15 1I 30-45 28 17 ~ 30-50 16 - 20-40 23 Tested per ASTM F36 6IT (formerly 0U4761T). CURVE A DYNAMIC LOAD COMPRESSION CURVES Curves are typical; variations can be expected in practice. Dynamic values may not agree with values shown in chart at left because of difference in test methods. B C D E B C D i density. These materials can also be used with much higher unit loads--4000 psi or higher--without extrusion or rupture. Cork materials offer a wide range of compressibility and will readily conform to flange surfaces. They are widely used to seal stamped metal flanges. Environmental Considerations Temperature Cork is generally recommended for use where sustained temperature at the gasket line does not exceed 250F. Contained fluids These materials are excellent for sealing lubricating oil and other petroleum derivatives, as well as fluids indicated on the selector chart on pages 18-19. They should not be used to seal inorganic acids, alkalis, or oxi dizing solutions. External For extra resistance to moisture and related con ditions of exposure, cork materials with synthetic resin binders will give the best service. USHO 003074 13 (^-mstrong gasket materials closed cell neoprene (chloroprene) rubber BRIEF OATA/CLOSED CELL NEOPRENE (CHLOROPRENE) RUBBER -Density--lb./cu. ft. Temperature Resistance, deg. F Low High Continuous High Intermittent Compression Set. maximum, % ASTM Method, 22 hrs. @ 70F {W sample compressed 50%) * Compression Deflection, psi (Weight required to compress a 1.129" diameter disc 25%) Accelerated Aging 7 days @ 158F Flexibility (180" bend) Appearance change Shrinkage, lineal maximum Water Absorption by Weight (max.) ASTM Method Specifications: ASTM D1056-62T and SAE J18 (Vs" to >/z" thickness) DE 41 8-12 -30 150 200 . 40 2 tO 5 ARMSTRONG TYPE DE-42 10-14 -30 150 200 DE-43 13-18 -30 150 200 30 30 b to 9 y to id No cracking None 5% 5% SCE-41 No cracking None 5% 5% SCE-42 No cracking None 5% 5% SCE-43 Forms and sizes Sheets: DE-41 and DE-42 40" x 62". DE-43 40" x 58". Thicknesses: from '/u" to 1 Vi". Die-cut parts available from Armstrong Approved Fabricators. `May vary according to thickness Armstrong Closed Cell Neoprene (chloroprene) stocks are flexible, conformable, and highly compressible materials de signed for a variety of applications that require a lightweight, shock-absorbing, resilient material. They meet the require ments for SCE-41, SCE-42, and SCE-43 as outlined in ASTM Specification D1056-62T as well as SAE Specification J18. These new materials are chemically blown to a tight, uniform, closed cell structure. The self-contained cells do not collapse even when the material is shaped to conform to curves and corners. The uniform structure also makes possible clean die cutting of practically any shape. Armstrong Closed Cell Neoprenes are impervious to air and water and are resistant to ozone attack and aging. They have been tested against the ASTM D1692 fire test and are rated as self-extinguishing. Armstrong Closed Cell Neoprenes are available in sheet form or die-cut to your specifications through Armstrong Approved Fabricators. 14 USHO 003075 gasket materials rubber BRIEF DATA/RUBBER COMPOUNDS* BASE TYPE CHARACTERISTICS AND USES Chloroprene (CR) DO-163 DO-174 DO-176 DO-178 NO-734 NO-736 NO-748 NO-723 Nitrilebutadiene (NBR) NO-731 NO-746 NO-758 Resistant to oils, including 10-C transformer oil: excellent dielectric strength for a stock of this hardness. Resistant to heat, oxidation, sunlight, oil. most solvents: excellent water resistance: high electrical resistance. Excellent resistance to oil, aromatic fuel blends and solvents, low compression-set characteristics: NO-736 is Underwriters' Approved. Excellent resistance to gasoline, oils, aromatic solvents: Underwriters' Approved. High solvent resistance; won't contaminate transformer insulating liquids. General purpose compound with good resistance to fuel and lubricating oils. Designed to provide non-contaminating seal for non flammable electrical insulating fluids. SHORE TYPE A HARDNESS (=5) 65 40 60 80 40 60 80 92 65 60 65 TENSILE (PSI MINIMUM) % ELONGATION BREAK. MIN. 1200 1850 1875 1900 1725 1500 1575 1900 550 625 300 150 500 350 130 120 1350 350 1300 2200 300 250 Forms and sizes Sheets: 18" x 36" available in thicknesses: 36" x 36" available in to Vi" thicknesses (in increments of Vu"). Also available in ribbon form. Die cut parts available only from Armstrong Approved Fabricators. SPECIFICATIONS MIL-R-15624D MIL-R-1149A(2) Type 1, Class 1 Class 1 Class 5 DO-174 DO-174 NO-734 aii tests in accordance with procedures listed m astm 02000 64T, Type li NO-731 NO-736 NO-746 General Properties Armstrong rubber materials are special formulations designed to provide a range of physical characteristics to meet the various requirements of resilient gasketing applications. These materials are based on either chloroprene or nitrilebutadiene rubbers and are available in a range of densities, tensile strengths, and elongations. The rubbers on which these materials are based can be identified by code letters as follows: D--chloroprene; N-- nitrile-butadiene. In all cases, the 0 indicates the absence of cork. Design Advantages Extensibility Rubber materials can be stretched over projec tions or shoulders and thus help to simplify assembly in some applications. Noncompressibility The tendency for rubber materials to side flow is an advantage in applications where it is desired to have the gasket flow into threads or recesses. Sealing Characteristics Rubber materials are essentially impermeable in their uncom pressed state. Generally, these materials require less sealing load than other resilient materials. To effect a seal, enough flange pressure should be available to provide a deflection of from 10% to 20% in the gasket. As a rule, it is best not to deflect straight rubber compounds more than 20%, since higher loading may induce compres sion set or hasten other effects of fatigue. Environmental Considerations Temperature In general, Armstrong rubber compounds are suggested for use in a temperature range of from -20F to 250F. Arbitrary limits, particularly on the high side, cannot be established. For recommendations on specific applications, consult your Armstrong Approved Fabricator or nearest In dustry Products Division office. Contained fluid Nitrile-butadiene stocks offer excellent re sistance to oil, aromatic fuels, blends, and solvents. Chloro prene compounds are also moderately resistant to oils and solvents. For suggestions on specific fluids, consult the selector chart on pages 18-19. External These materials are resistant to sunlight, ozone, weathering, and related effects of exposure. The chloroprene compounds excel in this respect. 15 (^)rn strong USHO 003076 cushioning material cork-and-rubber # Tape, die-cut parts, roils, ribbons Armstrong DK-153 is a cork-and-sponged-rubber composition that combines lasting resilience with high surface friction. It is used to eliminate squeaks, to cushion fragile parts, to make slippery surfaces non-skid, and to absorb shock or relative motion between adjoining parts of an assembly. A new polyethylene backing--in distinctive silver tone--pro tects DK-153's strong, pressure sensitive adhesive until the moment you're ready to use it. It is also available without adhesive backing, as DK-154. Cushions fragile parts Resilient DK-153 cushions fragile parts and prevents injury to easily marred surfaces. Used as a bumper pad on video tubes and as cushion strips on glass basketball backboards, it absorbs mechanical shocks that might damage these units. DK-153 will not stain or corrode the surface with which it is in contact. Eliminates squeaks Wherever adjacent parts rub, the resilient cork-and-rubber composition of Armstrong DK-153 prevents abrasion, squeaks, and rattles. Its adhesive backing holds DK-153 tightly to one adjoining member while its high-friction surface tends to snub movement in the opposite member. The relative motion that may remain is absorbed within the resilient DK-153 com position itself. Makes units non-skid On dial telephones, business machines, and small appli ances, the high surface friction of Armstrong DK-153 prevents slippage on polished desks and counters. Strips of DK-153 on file drawer bottoms help to keep file folders upright. Weatherproofs Armstrong DK-153 forms a tight seal against moisture and dust in such things as parking meters, electric lanterns, and automatic vending machines. In such applications, the cush ioning effect of DK-153 also helps to prevent breakage of glass. Simplifies assembly DK-153 saves time and simplifies assembly wherever it is used. To apply, simply strip off the protective backing and press the material into place. Its pressure-sensitive adhesive will stick instantly--and tightly--to any clean, dry surface. DK-153 is ideally suited to assembly line production. Government specification Armstrong DK-153 is made to meet Military Specification MIL-T-6841C. Forms and sizes OK-153 is available in 100-foot rolls in any width up to 36" and in to Vu" thicknesses. Forms: rolls, cut strips, and ribbons. Die-cut parts available only from Armstrong Approved Fabricators, it is also available without adhesive, as DK-154. 16 USHO 003077 friction materials resilient BRIEF DATA/RESIUENT FRICTION MATERIALS TYPE COEFFICIENT OF FRICTION FM-21 .90 dry .11 wet 366 1.10 dry .85 dry 975 .10 wet 1463 .90 dry Cork and rubber NC-733 Fiber FM-88 1.00 dry .15 to .17 wet .40 to .45 dry TYPICAL APPLICATIONS AND REMARKS Developed specifically for multiple disc clutches in automatic transmissions: oilproof, with excellent resistance to oil-water mixtures; very high resistance to wear and fade in wet applications. A high friction facing for dry applications only, widely used in light-duty clutches and brakes where an approach to a positive engagement is desired. Used extensively in automotive transmissions: oilproof; excellent resistance to compression set, good wear resistance in wet applications; also used in many light-duty dry applications. Successfully used for many years for clutches and brakes on looms, washing machines, and similar equipment; soft, smooth engagement characteristics. Developed for "direct drive" plates in automotive transmissions where a smooth, non-shock engagement is essential; also used in washing machines and industrial tools; recommended where facing pressure is below 90 psi, wet friction value shown here is at 45 psi on plate 9V4" O.D., 6V4" I.D., with six Va" radial slots. Used for clutch-brake materials in light-duty machine tools, coil winders, and industrial sewing machines where quiet, chatter-free operation is required. Armstrong resilient friction materials are available for a wide range of wet or dry friction applications. When correctly used these compounds operate successfully on jobs ranging from instrument chart drives to heavy-duty transmissions in road graders and tractors. These materials have high coefficients of friction. When running dry, certain of them approach a quick, positive en gagement; others can be slipped to permit smooth and shock-free engagement. Oil-immersed resilient friction materials engage smoothly and can accommodate fairly large speed differences between driving and driven units without wear on the facing. Since the requirements of friction drives vary so widely, we suggest that you call in your Armstrong representative when your unit is in the design stage. Data accumulated during years of research may provide a quick answer to your resilient clutch facing problem. Armstrong is equipped at its Pittsburgh Plant to do the assembly work of bonding friction surfacing materials to customer-supplied clutch plates of metal or plastic. A highstrength Armstrong thermosetting adhesive, cured under heat and pressure, is used for this work. Armstrong resilient friction materials are available die-cut to your specifications through Armstrong Approved Fabricators. USHO 003078 17 (Armstrong resilient gaskets resistance to common fluids || Liquid or gas to be sealed oc c =w <E 2 oou.-^> w=k --s EC: .-1-== .- c c ^ J < < < < < uj <<<<CQCQCQCQCJ > wa> _ c= P - o (JCJOOOQQuj ^ O uv3_ Cork compositions SUUS F UUUSSSSSF SSSUUSSSSSS S F S Chloroprene (CR) SSUS S UUUFUFFFU SUUUUUSUFSS F S F Corkandrubber compositions Nitrile-butadiene (NBR) US U S Styrene-butadiene (SBR) US S UUUSFSSUU SFUUSUSSUSS U U S S UUSSUFFUU SUUUUFSUUSS S S F Rubber compounds Butyl (HR) Chloroprene (CR) SSUS S UUSFUUUSU SUUUSSSSSSS U U U SSSS S SSUSUFFFF SUUBAUUSUFSS S S S Nitrile-butadiene U S F S (NBR) S SSUFFSSUU SFUUUUSFUSS S U S Accopac fiber sheet materials Nitrile-butadiene (NBR) Styrene-butadiene (SBR) Chloroprene (CR) U S F USUSFSSFU SFFUUFSSFSS S S S U S S USFFUUUSU SUUUUSSUSSS S S F s s sU S S USUSFSFFU SFFUUFSFFSS Key: S = Satisfactory F = Fair BA = Best material available, though not completely satisfactory U -- Unsatisfactory 18 USHO 003079 # 2 2> I a> _ -5 o -o 8I g 1 s 2ccc I 5) v> o O O O O a x>% x>v x>v ^' .f5: u <rt *a> uj <0 y 2. -'HS :S' *S8 = 2j a) 2 ~ O o_ o = "6 2< Qo <u c Q) a> m .2To=_2g axW.: <cS5. >n,o Ps 3 _o a 2 ro a. a s cl aj 00^33<TJO 'w3 co oj a) *5 rtj ffj Q_Q.O_Q.CLCLcOCOCOC/)</3(/5|-- I-- I-- h- > S 5 x SSSSUSUSSSS SFSUSSSSSUUS. SUFFUFUFSUSSFFS SFSSUSUFSF F-U SUSUUSSFUUSSSUFFUUUFUUUFFFU SSSSUSUFSS F-U SUSUUSUSFUSSSUF FUUUFF USSFF F FUSFUSUFSU F-U USUUFSUUUFSFSF FFUUUUUUUFFFU UUSFUSUSSU F-U USUUSSSUUSSFSSFFUUUUUUUFFFU S FSSF SS SS F F-U S U U BA U S F-S F U US SSUSS FFBASUUUF SS U SSSSFSSSSS F-U SUFBAUSUSFUSSSUSSFFBASFUFSSSF SSSSUSUSSSS SUSUUSSSUUUSSUSSS* UUSFUSSSSS UUSSUSUSSFU FF UUFSS FUFU USFSSS* 'UUSUUUSSSU SFSSUSUSSSF SS FUUSS SUUU SSUSS S'* UUSF UF SSSF AsbestosFiber Sheets only. The various classes of Armstrong gasket materials are listed in these tables, together with an indication of their resistance to common industrial fluids. No such list, of course, can reflect all variables and prefer ences. Beyond that, a decision to choose a particular gasket material should not be made apart from the various mechan ical factors of the joint. For these reasons, this list can be only a very general indication. We will be glad to make suggestions on specific sealing problems. USHO 003080 (^m strong 19 riw^--' n m -niirt^rr-i