Parker O-Ring Handbook.pdf

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Back-Up Rings 6-10 Parker O-Ring Handbook Comparison of Parbak vs. PTFE and Leather Back-Up Parker Parbaks PTFE Back-Up Rings Leather Back-Up Rings Continuous ring. Easiest and quickest to assemble in either piston or cylinder groove. Good resistance to extrusion. Standard material satisfactory up to (121°C) 250°F. Other compounds available for temperatures as high as (204°C) 400°F. Does not cause overly smooth rubbing surface. Maintains lubrication. Good resistance to radiation. Can be made in compound having even better resistance when required. Continuous ring with no loose particles or sections. No scarf cut to open. Coeffi cient of thermal expansion comparable to O-ring material. Continuous ring, no scarf cut. Absorbs slight amount of oil, aiding lubrication. Resists cold fl ow and tendency to extrude under high pressure. Spiral or scarf-cut for most applications. This discontinuity is often a cause of leaks or damage to the O-ring. Moderately simple to assemble. Scarf or spiral cut can be opened, for assembling over piston or doubled over itself for assembly into cylinder groove. Tends to soften and extrude at temper atures around (149°C) 300°F. Deposits on rubbing surface making it extremely smooth. The O-ring then wipes the surface dry. Continuous ring. Diffi cult to assemble over piston. Must be soaked in oil, stretched, then pounded into place. Less diffi cult to assemble into cylinder groove. Tends to harden and crack at high temperature. Does not cause overly smooth rubbing surface. Maintains lubrication. Fair resistance to radiation. No information available. Thin sections of spiral may become lodged under O-ring causing leakage. Low temperature shrinkage may open up scarf cut, causing temperature leakage. High temperature expansion may overlap scarf cut causing damage to O-ring. Almost completely non-absorbent, will not hold enough oil to aid lubrication. Will cold fl ow and extrude at room temperature and high pressure. Loose leather fi bers may become lodged under O-ring causing leakage. Continuous ring. Continuous ring, no scarf cut. Tends to absorb moisture, increasing possibility of corrosion. Resists cold fl ow and tendency to extrude under high pressure. Uniform dimensions. Uniform dimensions. Variable dimensions. Table 6-3: Comparison of Parbak vs. PTFE and Leather Back-Up Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 Fax: (859) 335-5128 www.parkerorings.com
Parker O-Ring Handbook Section VII – Compatibility Tables for Gases, Fluids, Solids Fluid Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . 7-2 Parker Hannifi n Corporation • O-Ring Division 2360 Palumbo Drive, Lexington, KY 40509 Phone: (859) 269-2351 Fax: (859) 335-5128 www.parkerorings.com Compatibility Tables for Gases, Fluids, Solids 7-1
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aerospace climate control electrome
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50 th 50 th 50 th Anniversary Editi
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Section I - Introduction 1.0 How to
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1.4 Operation All robust seals are
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1.7.1 Static Seals In a truly stati
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1.11 Comparison of Common Seal Type
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Section II - Basic O-Ring Elastomer
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2.1.2 Rubber Rubber-like materials
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2.2.6 Chloroprene Rubber (CR) Chlor
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2.3 Compound Selection and Numberin
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O-ring seal, whether static or dyna
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Percent Compression 40% 30% 20% 10%
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Percent Compression 40% 30% 20% 10%
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Compression Set (% ) 100 Figure 2-1
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2.4.12 Thermal Effects All rubber i
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coeffi cient of expansion for that
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2.6 Aging Deterioration with time o
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A well-known rapid method for mater
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2.13.2 Temperature Temperature rang
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100 80 60 40 20 0 °C -50 °F -58 -
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misapplication might be greatly red
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c. Elongation Change Experience wil
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is possible to receive a part with
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Section III - O-Ring Applications 3
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3.1.2 Temperature Operating tempera
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O-Lube has some unique advantages.
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Parker Boss Kit Sizes Size Dimensio
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Recovery Percent of Original Delect
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3.9.5 Fuels for Automobile Engines
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Parker Seal produces a number of co
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3.9.16 Fungus-Resistant Compounds B
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3.9.17.2 Concentrates Containing Mi
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Where temperatures do not go below
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Permeability Rate - CC/SEC/ATM Effe
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Underwriters’ Laboratories Approv
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Parker Seal Elastic Drive Belt Comp
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Parker O-Ring Handbook Gas Permeabi
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Section IV - Static O-Ring Sealing
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The 4-3 and 4-7 design charts are o
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(e) 0° to 5° (Typ.) 63 Break Corn
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215 1.301 1.305 1.079 1.060 1.063 1
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Guide for Design Table 4-2 If Desir
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Parker O-Ring Handbook Gland Dimens
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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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Page 117 and 118: For the same conditions, friction a
Page 119 and 120: 5.15 Spiral Failure A unique type o
Page 121 and 122: 5.16.1 Small Amount of Leakage 1. E
Page 123 and 124: Recommended dimensions for fl oatin
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Page 127 and 128: 5.30.2 Calculation of Drive Belt Cr
Page 129 and 130: Parker O-Ring Handbook Gland Design
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Page 137 and 138: X Gland Detail 0° to 5° Break Cor
Page 139 and 140: Parker O-Ring Handbook Gland Dimens
Page 141 and 142: 5.31.3 O-Ring Glands for Pneumatic
Page 143 and 144: Parker O-Ring Handbook Design Table
Page 145 and 146: 5.31.4 O-Ring Glands for Rotary Sea
Page 147 and 148: Parker O-Ring Handbook Rotary O-Rin
Page 149 and 150: Parker O-Ring Handbook Rotary O-Rin
Page 151 and 152: Section VI - Back-Up Rings 6.1 Intr
Page 153 and 154: 6.4.2 Metal Non-Extrusion Rings In
Page 155 and 156: Parker Parbak 8-Series Dimensions (
Page 157 and 158: Parker Parbak 8-Series Dimensions (
Page 159: Back-Up Rings Cross Reference (Cont
Page 163 and 164: COMPOUND COMPATIBILITY RATING 1 - S
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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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