AS-568BStandard O-Rings Quick Reference Chart

1 AS-568B Standard O-Rings Quick Reference ChartBuna-N:In the Buna-N family, you will find compounds which are ideally suited for oil resistantapplications of all :In the Ethylene-Propylene family, you will find compounds that are usedextensively for outdoor, weatherresistant uses, water first choice for low torque drive :In the Silicone family, you will find compounds which areexcellent as static seals in extremetemperature Polyurethane:In the CastPolyurethane family, you will findcompounds which are used predominantly in high hydraulic pressure applications and situationswhere highly stressed parts aresubject to : In the Neoprene family,you will find compounds which arethe superior sealing materials forthe refrigeration industry featuringresistance to ammonia and Freon.

2 Fluorocarbon:In the Fluorocarbonfamily, you will find compoundswhich make-up the preferred sealsfor aircraft engines, automotive fuel handling systems and hardvacuum :In theFluorosilicone family, you will findcompounds which make-up sealsthat are unparalleled for aerospacefuel systems and auto fuel emissioncontrol materials are compounded understringent quality control for uniformityof physical properties, and to meet or exceed Government, Military, Space Program, Automotive, , Industrial and Determine Material:1.

3 Determine end use: static (stationary) or dynamic (moving).2. List the substance that the sealwill be exposed to and check O-Ring material resistances inChemical Compatibility Table(s)listed in the Apple Seal Design List ALL factors of seal application and check Pressure: determines materialhardness and Heat/Cold: check material temperature range(s).C. Friction: determines materialhardness and Permeability: important for pneumatic and vacuum Economy: see General Propertieschart located in the Apple SealDesign Guide for most economical choice when several materials will O-Rings are available in a choice of seven basic materials (1) each in a range of optional Durometer (Shore A) Hardnesses.

4 Other materials available upon Material DesignationDurometers (Shore A)Temperature RangeThe most commonly used durometer is 70. Although other durometers are offered, availability may be limited due to processing or shrinkage Quotes, Prototypes or Questions Call: 1-800-828-7745 or visit (Nitrile) (NBR)BN40 thru 90-40 to +250 F (-40 to +121 C)Dry Heat OnlyEthylene-Propylene (EPM/EPDM)EP40 thru 90-60 to +300 F (-51 to +150 C)Dry Heat OnlySilicone (MQ; PMQ; VMQ; PVMQ)SL25 thru 80-75 to +450 F ( to +232 C)Dry Heat OnlyCast PolyurethaneCP70 & 90-60 to +225 F (-51 to +107 C)Dry Heat OnlyNeoprene (Chloroprene) (CR)CR40 thru 90-45 to +250 F (-43 to +107 C)Dry Heat OnlyFluorocarbon (Viton ) (Fluorel ) (FKM)VT50 thru 95-20 to +400 F (-29 to +204 C)Dry Heat OnlyFluorosilicone (FVMQ)FS50 thru 80-75 to +400 F ( to +204 C)Dry Heat OnlyGeneral ApplicationsPresently the seal industry s most widely used elastometer.

5 Nitrile combines excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols, with a good balance of such desirable working properties as low compression set, high tensile strength, and high abrasion good resistance to such polar solvents as ketones (MEK & Acetone). EPM/EPDM is also highly recommended for effective resistance to steam (to 400 F), hot water, silicone oils and greases, dilute acids and alkalies, alcohols and automotive brake resistant to high, dry heat, in primarily static are fungus resistant, odorless, tasteless, non-toxic elastomers, possessing high resistance to the aging effects of both sunlight and ozone in abrasion resistance, tensile strength, and low friction qualities.

6 Cast Polyurethane compounds feature excellent resistance to mineral-based oils and petroleum products, aliphatic solvents,alcohols and early developed, oil-resistant substitute for Natural Rubber, Neoprene features moderate resistance to petroleum oils; good resistance to ozone, sunlight and oxygen aging; relatively low compression set; good resilience; reasonable cost; and high resistance to attack by Freon and high temperature toughness with wide chemical agent compatibility, Fluorocarbon compounds feature excellent resistance to petroleum products and solvents, with good high temperature compression set the good high and low temperature stability of Silicones with the fuel, oil, and solvent resistance of fluorocarbons.

7 FS compounds feature good compression set and resilience properties. FS compounds are suitable for exposure to air, sunlight, ozone, chlorinated and aromatic SectionStandard O-RingsSeal Types & Gland DesignEvery Standard AS-568B Size in Stock:Listed in inches. Includes all standard sfrom 1/32" to 26," s from 3/32" to 26 1/2" and Cross Sections (widths) from1/32" to 1/4." Constantly restocked toassure immediate delivery of any size in small or large Reference Easy to Order:All theinformation you need at a glance.

8 All sizeslisted by ascending inside diameter ( ) in fractional AND decimal sizes. StandardAS-568B Uniform Numbering System (Order by a single number).Choice of Seven Materials as Standard:Rubber compounds and options ofDurometer hardness to satisfy practicallyany service condition. Check with our sales staff for other material Delivery on O-Rings :Most likely thesize and compound you require is in our stockof over 300,000,000 O-Rings . Immediateshipments with no intermediate delays.(Remember with Apple you can buy direct.)

9 O-Ring size is defined by inside diameter and width (cross-section) and is listed in both fractional and decimal dimensionswith to Order:The temperatures listed aregeneral operating ranges for the entire family of each will vary with specific compoundsand/or length of exposure to temperatureextremes. For example, silicon may still beserviceable with limited exposure to 700 highly recommend that in all cases,samples of a specific size and compoundshould be tested in the application beforeuse in Catalog Numbers are identical to theAS-568B Numbering System, indicatingprecise.

10 And Width dimensions ofO-Rings in one ordering Gland Design For Static SealsO-Ring Gland Design For Dynamic SealsNo OneTwoBackupBackupBackupRadialAxialInche s%Inches%RingsRingRingsEccentricity RadiusDiametrical DepthGroove RadiusDiametrical Cross SectionGroove Width .005 Gland DepthSqueezeRadialAxialTwoBackupRingsGro ove Width .005 SqueezeOneBackupRingNoBackupRings%Inches Inside DiameterWidth (Cross Section).003" (.08mm) " (.13mm) to Determine O-Ring Size* For sequence in ordering:1.