Parker O-Ring Handbook.pdf

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O-Ring Applications 3-4 3.1.5 Lubrication Lubrication of O-ring seals is extremely important for installation and operation of dynamic seals as well as proper seating of static seals. The general rule for use of lubrication is: The greatest benefi t in using a lubricant is obtained during the initial installation of the O-ring. Lubricants are commonly used on O-rings and other elastomeric seals. Using a suitable grease or oil during assembly helps protect the O-ring from damage by abrasion, pinching, or cutting. It also helps to seat the O-ring properly, speeds up assembly operations, and makes automated assembly line procedures possible. An additional benefi t is the protection that the lubricant provides as a surface fi lm. Proper lubrication also helps protect some polymers from degradation by atmospheric elements such as ozone and its presence helps extend the service life of any O-ring. A lubricant is almost essential in pneumatic applications requiring dynamic service. In vacuum applications, appropriate lubricants help reduce the overall leak rate by fi lling the microfi ne inclusions of the gland’s metal surfaces and lowering permeation rates of the elastomer. Parker Seal offers two lubricants that will satisfy most service needs: Parker O-Lube and Parker Super-O-Lube. These two lubricants are described in the following paragraphs. Table 3-1 lists their key properties along with others used in specifi c types of services. Table 3-2 provides part number information for O-Lube and Super O-Lube. Parker O-Ring Handbook 3.1.5.1 Parker O-Lube Parker O-Lube is an outstanding general-purpose grease intended for use with O-ring and other seals in hydrocarbon service. It can also be used in pneumatic service. The useful temperature is from -29°C to 82°C (-20°F to 180°F). 3.1.5.2 Parker Super-O-Lube Parker Super-O-Lube is an all-purpose O-ring lubricant. It is not a grease, but rather a high-viscosity silicone oil. It is especially useful as a seal lubricant. The temperature range is -54°C to 204°C (-65°F to 400°F). Parker Super-O-Lube can be used as an assembly lubricant on all rubber polymers, including silicones. (Note: Silicones require special consideration.) In addition, Parker Super- Lubricants Type of Elastomer Type of Service Best Manufacturer Temp Range °F NBR, Nitrile CR, Neoprene EPDM Silicone Fluorosilicone Fluorocarbon Hydraulic Oils & Fuels Extreme Service Pneumatic Vacuum Hydraulic Oils & Freon ® Vacuum Skydrol ® Steam & Hot Water General High Temperature Oil or Fuel High Temperature Hydraulic Vacuum & High Temperature Parker O-Ring Lubricants O-Lube Super-O-Lube Part Number Description Part Number Description OLUBE 2 gr. tube SLUBE 2 gr. tube 884-2GRAMS 884-Grams OLUBE .25OZ ¼ oz. tube SLUBE .25OZ ¼ oz. tube OLUBE 884-.50 ½ oz. tube SLUBE 884-.5 ½ oz. tube OLUBE 884-4 4 oz. tube SLUBE 884-2 2 oz. tube OLUBE 884-35 35 lb. pail SLUBE 884-8 8 lb. can OLUBE 884-400 400 lb. drum SLUBE 884-40 40 lb pail Note: MSDS are available at www.parkerorings.com Table 3-2: O-Ring Lubricants O-Lube Parker -20 to 180 Petrolatum Many -20 to 180 Barium Grease Many -20 to 300 Super O-Lube Parker -65 to 400 DC-55 Dow Corning Co. -65 to 275 Celvacene Consolidated Vacuum Corp. -40 to 200 O-Lube Parker -20 to 180 Petrolatum Many -20 to 180 Celvacene Consolidated Vacuum Corp, -40 to 200 MCS-352 Aviation Fluid Service Co. -65 to 300 Super O-Lube Parker -65 to 400 DC4, DC-7, DC55 Dow Corning Co. +32 to 350 Petrolatum Many -20 to 300 FS1292 Dow Corning Co. -20 to 400 Mil P 37649 Many -20 to 180 Petrolatum Many -65 to 350 Super O-Lube Parker -65 to 400 DC 4 or DC-7 Dow Corning Co. +32 to 350 Petrolatum Many -20 to 180 Super O-Lube Parker -65 to 400 DC-55 Dow Corning -65 to 400 Notes: Assembly lubricants should always be used sparingly during application. A light fi lm is all that is required. This is doubly important in cases 1 and 2 below. 1. When only a thin fi lm of O-Lube is used for assembly purposes, the assembly may be subject to higher temperatures, with limits determined by the fl uid and elastomer being used. 2. Use only a thin fi lm of Super-O-Lube on silicone rubber if the temperature will exceed 149°C (300°F). Table 3-1: Parker O-Ring Lubricants Freon® is a registered trademark of E.I. du Pont de Nemours & Co. Skydrol® is a registered trademark of Solutia Inc. Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 Fax: (859) 335-5128 www.parkerorings.com
O-Lube has some unique advantages. It clings tenaciously to rubber or metal surface helping to prevent it from being fl ushed away by action of the system fl uid. It has one of the widest temperature ranges of any seal lubricant available. It can be used for high pressure systems or in hard vacuum environments. Super-O-Lube’s inert nature lends itself to a wide variety of fl uid systems. Since there are no organic fi llers, there can be no clogging of microfi lters. In addition to its outstanding performance in internal service, Parker Super-O-Lube gives protection to rubber polymers that are normally age sensitive when exposed to the atmosphere. This is a typical concern with ozone sensitive polymers that require age control. There are special situations that may exist where one of the two Parker lubricants would not be the best recommendation. For instance, there may be a need for a special high vacuum grease, or a lubricant that would be especially suited to phosphate ester service. For guidance in handling these unique situations consult a Parker O-Ring Division Application Engineer. Before selecting a lubricant (other than the primary fl uid being sealed) for use with O-rings, determine that it meets the following requirements: 1. It or any additives that it contains, should not cause shrinkage or excessive swelling of the O-ring compound being used. 2. It should not excessively soften or solidify over the anticipated service temperature range. 3. It should not break-down and leave gummy or gritty deposits after cycling, or show any adverse chemical reaction with the primary fl uid being sealed. 4. It should be capable of forming a thin, strong (high surface tension) fi lm over the metal being lubricated that the O-ring’s dynamic motion cannot wipe away. 5. It should pass through any fi lters used in the system. 3.1.5.3 PTFE Coatings PTFE coatings of O-rings is an ideal low-friction coating where operational fl exibility is a major consideration. PTFE also offers additional benefi ts such as: • Positive identifi cation at the assembly line • Ease of installation • Lower break-in torques • Reduces costly “hang-ups” on automatic systems • Lower initial running friction • Eliminates sticking of components after long storage • Reduces twisting of rings during installation The following colors are available: standard blue, medium blue, light blue, white, purple, red, yellow, medium green, dark green, grey, clear, black, orange, brown umber, pink and green/gold. Parker O-Ring Handbook 3.1.5.4 Other Friction Reduction Methods Besides O-Lube and Super-O-Lube, Parker Seal can supply O-rings that have received various friction reducing treatments. These may include internal lubrication and Parker’s Proprietary Lube Treatment. Both are valuable aids for automated assembly operations, and may also be used in many types of applications to reduce friction in service. Note: While it is always preferable to use a lubricant, keep in mind that there are certain systems in which lubricants would introduce unacceptable contamination, such as semiconductor fabrication and processing equipment or medical and food processing devices. 3.1.5.5 Internal Lubrication Internal lubrication involves the incorporation of friction reducing ingredients into the elastomer formula. Since this process alters the material’s chemistry, Parker’s internally lubricated materials are assigned unique compound numbers to differentiate them from their non-lubricated counterparts. Internal lubricants consist of organic materials such as graphite, molybdenum disulfi de, powdered PTFE or, more commonly, a proprietary Parker organic lubricant. Because the lubricant is dispersed throughout the body of an O-ring, this method of friction reduction generally functions longer in service than external lubrication, but to a somewhat lesser degree. Graphite-impregnated compounds are commonly used to seal rotary shafts. It should not however, be used in contact with stainless steel surfaces because graphite tends to cause corrosive pitting of stainless materials. For such applications, compounds containing molybdenum disulfi de are often a successful alternative. Compound V0848-75 contains powdered PTFE to reduce friction. Compounds containing this organic lubricant have become quite popular. PTFE migrates through the O-ring and gradually blooms to the surface, prolonging its lubricating effectiveness. It takes a long time to degrade a signifi cant portion of the coating when it is lost only through the mechanical action of the mating surface. Fluids, however, tend to dissolve it, and some solvents can leach out much of the internal lubricant in a short time. Internally lubricated compounds, where applicable, are available from the O-Ring Division. Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 Fax: (859) 335-5128 www.parkerorings.com O-Ring Applications 3-5
Page 1 and 2: aerospace climate control electrome
Page 3 and 4: 50 th 50 th 50 th Anniversary Editi
Page 5 and 6: Section I - Introduction 1.0 How to
Page 7 and 8: 1.4 Operation All robust seals are
Page 9 and 10: 1.7.1 Static Seals In a truly stati
Page 11 and 12: 1.11 Comparison of Common Seal Type
Page 13 and 14: Section II - Basic O-Ring Elastomer
Page 15 and 16: 2.1.2 Rubber Rubber-like materials
Page 17 and 18: 2.2.6 Chloroprene Rubber (CR) Chlor
Page 19 and 20: 2.3 Compound Selection and Numberin
Page 21 and 22: O-ring seal, whether static or dyna
Page 23 and 24: Percent Compression 40% 30% 20% 10%
Page 25 and 26: Percent Compression 40% 30% 20% 10%
Page 27 and 28: Compression Set (% ) 100 Figure 2-1
Page 29 and 30: 2.4.12 Thermal Effects All rubber i
Page 31 and 32: coeffi cient of expansion for that
Page 33 and 34: 2.6 Aging Deterioration with time o
Page 35 and 36: A well-known rapid method for mater
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Page 49: 3.1.2 Temperature Operating tempera
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Page 55 and 56: Recovery Percent of Original Delect
Page 57 and 58: 3.9.5 Fuels for Automobile Engines
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Page 65 and 66: Where temperatures do not go below
Page 67 and 68: Permeability Rate - CC/SEC/ATM Effe
Page 69 and 70: Underwriters’ Laboratories Approv
Page 71 and 72: Parker Seal Elastic Drive Belt Comp
Page 73 and 74: Parker O-Ring Handbook Gas Permeabi
Page 81 and 82: Section IV - Static O-Ring Sealing
Page 83 and 84: The 4-3 and 4-7 design charts are o
Page 85 and 86: (e) 0° to 5° (Typ.) 63 Break Corn
Page 87 and 88: 215 1.301 1.305 1.079 1.060 1.063 1
Page 89 and 90: Guide for Design Table 4-2 If Desir
Page 91 and 92: Parker O-Ring Handbook Gland Dimens
Page 99 and 100: Dovetail Grooves It is often necess
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Parker O-Ring Handbook This type of
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F .031 .016 RAD K Parker O-Ring Han
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Gland Detail 0° to 5° Break Corne
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Section V - Dynamic O-Ring Sealing
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When a cylinder rod extends out int
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It can be clearly seen from Figure
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5.11 Friction Friction, either brea
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5-9 Dynamic O-Ring Sealing Parker H
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For the same conditions, friction a
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5.15 Spiral Failure A unique type o
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5.16.1 Small Amount of Leakage 1. E
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Recommended dimensions for fl oatin
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for this service. See Section II, B
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5.30.2 Calculation of Drive Belt Cr
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Parker O-Ring Handbook Gland Design
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124 125 126 127 128 129 130 131 132
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240 241 242 243 244 245 246 247 325
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448 449 450 451 452 453 454 455 456
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X Gland Detail 0° to 5° Break Cor
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Parker O-Ring Handbook Gland Dimens
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5.31.3 O-Ring Glands for Pneumatic
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Parker O-Ring Handbook Design Table
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5.31.4 O-Ring Glands for Rotary Sea
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Parker O-Ring Handbook Rotary O-Rin
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Parker O-Ring Handbook Rotary O-Rin
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Section VI - Back-Up Rings 6.1 Intr
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6.4.2 Metal Non-Extrusion Rings In
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Parker Parbak 8-Series Dimensions (
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Parker Parbak 8-Series Dimensions (
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Back-Up Rings Cross Reference (Cont
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Parker O-Ring Handbook Section VII
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COMPOUND COMPATIBILITY RATING 1 - S
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Section VIII - Specifi cations 8.1
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Military Fluid Specifi cation Descr
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AMS (1) and NAS (2) Rubber Specifi
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Parker O-Ring Handbook Compound Sel
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Section IX Sizes Parker Series 2-XX
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Table 9-1: Parker Series 2-XXX O-Ri
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Parker O-Ring Handbook Parker Serie
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Parker Series 5-XXX O-Ring Sizes (C
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Parker Series 5-XXX O-Ring Sizes (C
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Series 5-XXX Locator Table Size I.D
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Parker O-Ring Handbook Inside Diame
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JIS B2401 Sizes JIS Thickness Inner
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Parker O-Ring Handbook Unusual Size
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Parker O-Ring Handbook Unusual Size
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Section X - Appendix 10.1 O-Ring Fa
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10.1.1.2 Extrusion and Nibbling Ext
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10.1.1.6 Installation Damage Many O
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Parker Seal also has the capability
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10.3 Glossary of Seal and Rubber Te
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Flash: Excess rubber left around ru
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(b) REP (Roentgen equivalent-physic
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10.4 Abbreviations ACM Polyacrylate
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Compound Shrinkage Class Compound N
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Table 10-8: Dimensions From Standar
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Parker O-Ring Handbook Dimensions F
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Appendix 10-32 Parker O-Ring Handbo
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Index — A — Abbreviations. . .
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International O-Ring Standards and
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Offer of Sale 1. Terms and Conditio
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Parker’s Total inPHorm Take the g
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