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TECHNICAL INFORMATION AND REFERENCE
rpm mechanical inc. 1-888-842-5668 www.rpmmechanical.com
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EXAMPLE: 2BA610 A14 C12 L14While not a part of the specification itself,the following chart presents the assigned
Classification System for Elastomeric Materials
material prefix letters and the polymer suchprefix would normally call out. This is theconversion equivalent applicable under:
D-2000 and J-200 D-735 and J-14
AA — Natural, SBR, Butyl, Isoprene . . . . . . . . . . . . . . . . . . . . . . . . .RAK — Polysulphide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SABA — Ethylene-Propylene, Heat Resistant SBR and Butyl . . . . . . . . . .—BC — Chloroprene-Neoprene . . . . . . . . . . . . . . . . . . . . . . . . . . . .SCBE — Chloroprene-Neoprene (lower oil swell and comp. set) . . . . . . .—BF — Nitrile — E14-E34 Requirements . . . . . . . . . . . . . . . . . . . . . .—BG — Nitrile — E51-E61 Requirements . . . . . . . . . . . . . . . . . . . . .SBBK — Organic Dihalide (Thiokol) . . . . . . . . . . . . . . . . . . . . . . . . .SACA — Ethylene-Propylene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .—CE — Chlorosulfanated Polyethylene (Hypalon) . . . . . . . . . . . . . . . .—CH — Nitrile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .—DF — Polyacrilic (Butyl-Acrylate Type) . . . . . . . . . . . . . . . . . . . . . .—DH — Polyacrilic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TBFC — Silicone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TAFE — Silicone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .—FK — Fluorinated Silicone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .—
1ST DESIGNATE (2)Grade number — used to designatesupplemental requirements beyond the basiccall out. Your supplier can develop this.
2ND DESIGNATE (B)Indicative of heat resistant requirements atwhich polymer shall be tested.
BASIC REQUIREMENTS FOR ESTABLISHINGTYPE BY TEMPERATURE
Test TemperatureType °C °F
A 70 158B 100 212C 125 257D 150 302E 175 347F 200 392G 225 437H 250 482J 275 527
3RD DESIGNATE (A)Indicative of degree of oil resistance asmeasured by volume swell under testprocedures.
BASIC REQUIREMENTS FOR ESTABLISHINGCLASS BY VOLUME SWELL
Class Volume Swell, Max. %
A No requirement B 140 C 120 D 100 E 80 F 60G 40H 30J 20K 10
4TH DESIGNATE (6)Indicative of hardness required, as 60 ± 5Shore “A”.
TECHNICAL INFORMATION AND REFERENCE
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5TH AND 6TH DESIGNATE (1 & 0)Indicative of tensile strength required, as1,000 PSI written in hundreds of PSI.
7TH DESIGNATEThe suffix letters (A, C, L) indicatesupplemental requirements for particularapplications that set up more rigid testprocedures — beyond the basic call out.
MEANING OF SUFFIX LETTERS
Suffix Test Required
A Heat Resistance B Compression Set C Ozone or Weather Resistance D Compression Deflection
Resistance E Fluid Resistance F Low Temperature Resistance G Tear Resistance H Flex Resistance J Abrasion ResistanceK AdhesionL Water ResistanceM Flammability ResistanceN Impact ResistanceP Staining ResistanceR ResilienceZ Any special requirement to be
specified in detail
8TH DESIGNATEThe suffix numbers (14, 12, 14) indicate theASTM test method applicable by the firstdigit.
9TH DESIGNATEThe suffix numbers, (in this case 14, 12, 14)the second digit denotes the temperature atwhich the test shall be conducted.
FOR SUFFIX LETTERS: A, B, C, E, G, K, L
1 = 73 Deg. F. 2 = 100 Deg. F. 3 = 158 Deg. F. 4 = 212 Deg. F.5 = 257 Deg. F. 6 = 302 Deg. F.
FOR SUFFIX LETTER: K
4 = Zero Deg. F.5 = Minus 13 Deg. F.6 = Minus 31 Deg. F.7 = Minus 40 Deg. F.8 = Minus 58 Deg. F.9 = Minus 67 Deg. F.
10 = Minus 85 Deg. F.11 = Minus 103 Deg. F.
TECHNICAL INFORMATION AND REFERENCE
rpm mechanical inc. 1-888-842-5668 www.rpmmechanical.com
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Tolerance Tables
Cross Sectional Tolerances for Group 1 — Compounds Only
Dimension Dimension Dimension(Inches) Tolerance (Inches) (Millimeters) Tolerance
Above - Incl. (Fractions) Above - Incl.
HIGH PRECISIONRMA — CLASS A — DWG DESIGNATION A
0.00 - 0.10* ±.008 (0 - 3/32) 0.0 - 2.5* ±0.200.10 - 0.16 0.010 (3/32 - 5/32) 2.5 - 4.0 0.250.16 - 0.25 0.013 (5/32 - 1/4) 4.0 - 6.3 0.320.25 - 0.40 0.016 (1/4 - 13/32) 6.3 - 10.0 0.400.40 - 0.63 0.020 (13/32 - 5/8) 10.0 - 16.0 0.500.63 - 1.00 0.025 (5/8 - 1) 16.0 - 25.0 0.63
Use ± 2-1/4% for dimensions over 1.00 inch
PRECISIONRMA — CLASS 1 — DWG DESIGNATION A1
0.00 - 0.10* ±.010 (0 - 3/32) 0.0 - 2.5* ±0.250.10 - 0.16 0.013 (3/32 - 5/32) 2.5 - 4.0 0.320.16 - 0.25 0.016 (5/32 - 1/4) 4.0 - 6.3 0.400.25 - 0.40 0.020 (1/4 - 13/32) 6.3 - 10.0 0.500.40 - 0.63 0.025 (13/32 - 5/8) 10.0 - 16.0 0.630.63 - 1.00 0.032 (5/8 - 1) 16.0 - 25.0 0.80
Use ± 2-3/4% for dimensions over 1.00 inch
COMMERCIALRMA — CLASS 2 — DWG DESIGNATION A2
0.00 - 0.10* ±.013 (0 - 3/32) 0.0 - 2.5* ±0.320.10 - 0.16 0.016 (3/32 - 5/32) 2.5 - 4.0 0.400.16 - 0.25 0.020 (5/32 - 1/4) 4.0 - 6.3 0.500.25 - 0.40 0.025 (1/4 - 13/32) 6.3 - 10.0 0.630.40 - 0.63 0.032 (13/32 - 5/8) 10.0 - 16.0 0.800.63 - 1.00 0.040 (5/8 - 1) 16.0 - 25.0 1.00
Use ± 3-1/2% for dimensions over 1.00 inch
NON-CRITICALRMA — CLASS 3 — DWG DESIGNATION A3
0.00 - 0.10* ±.016 (0 - 3/32) 0.0 - 2.5* ±0.400.10 - 0.16 0.020 (3/32 - 5/32) 2.5 - 4.0 0.500.16 - 0.25 0.025 (5/32 - 1/4) 4.0 - 6.3 0.630.25 - 0.40 0.032 (1/4 - 13/32) 6.3 - 10.0 0.800.40 - 0.63 0.040 (13/32 - 5/8) 10.0 - 16.0 1.000.63 - 1.00 0.050 (5/8 - 1) 16.0 - 25.0 1.25
Use ± 4-1/2% for dimensions over 1.00 inch
*General cross-sectional dimensions below 0.040" (1 mm) are impractical.
TECHNICAL INFORMATION AND REFERENCE
rpm mechanical inc. 1-888-842-5668 www.rpmmechanical.com
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Tolerance Tables
Cross Sectional Tolerances for Group 2 — Compounds Only
Dimension Dimension Dimension(Inches) Tolerance (Inches) (Millimeters) Tolerance
Above - Incl. (Fractions) Above - Incl.
HIGH PRECISIONRMA — CLASS A — DWG DESIGNATION A
0.00 - 0.10* ±.010 (0 - 3/32) 0.0 - 2.5* ±0.250.10 - 0.16 0.013 (3/32 - 5/32) 2.5 - 4.0 0.320.16 - 0.25 0.016 (5/32 - 1/4) 4.0 - 6.3 0.400.25 - 0.40 0.020 (1/4 - 13/32) 6.3 - 10.0 0.500.40 - 0.63 0.025 (13/32 - 5/8) 10.0 - 16.0 0.630.63 - 1.00 0.032 (5/8 - 1) 16.0 - 25.0 0.80
Use ± 2-3/4% for dimensions over 1.00 inch
PRECISIONRMA — CLASS 1 — DWG DESIGNATION A1
0.00 - 0.10* ±.013 (0 - 3/32) 0.0 - 2.5* ±0.320.10 - 0.16 0.016 (3/32 - 5/32) 2.5 - 4.0 0.400.16 - 0.25 0.020 (5/32 - 1/4) 4.0 - 6.3 0.500.25 - 0.40 0.025 (1/4 - 13/32) 6.3 - 10.0 0.630.40 - 0.63 0.030 (13/32 - 5/8) 10.0 - 16.0 0.800.63 - 1.00 0.040 (5/8 - 1) 16.0 - 25.0 1.00
Use ± 3-1/2% for dimensions over 1.00 inch
COMMERCIALRMA — CLASS 2 — DWG DESIGNATION A2
0.00 - 0.10* ±.016 (0 - 3/32) 0.0 - 2.5* ±0.400.10 - 0.16 0.020 (3/32 - 5/32) 2.5 - 4.0 0.500.16 - 0.25 0.025 (5/32 - 1/4) 4.0 - 6.3 0.630.25 - 0.40 0.030 (1/4 - 13/32) 6.3 - 10.0 0.800.40 - 0.63 0.040 (13/32 - 5/8) 10.0 - 16.0 1.000.63 - 1.00 0.050 (5/8 - 1) 16.0 - 25.0 1.25
Use ± 4-1/2% for dimensions over 1.00 inch
NON-CRITICALRMA — CLASS 3 — DWG DESIGNATION A3
0.00 - 0.10* ±.020 (0 - 3/32) 0.0 - 2.5* ±0.500.10 - 0.16 0.025 (3/32 - 5/32) 2.5 - 4.0 0.630.16 - 0.25 0.030 (5/32 - 1/4) 4.0 - 6.3 0.800.25 - 0.40 0.040 (1/4 - 13/32) 6.3 - 10.0 1.000.40 - 0.63 0.050 (13/32 - 5/8) 10.0 - 16.0 1.250.63 - 1.00 0.063 (5/8 - 1) 16.0 - 25.0 1.60
Use ± 5-1/2% for dimensions over 1.00 inch
*General cross-sectional dimensions below 0.040" (1 mm) are impractical.
TECHNICAL INFORMATION AND REFERENCE
rpm mechanical inc. 1-888-842-5668 www.rpmmechanical.com
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Tolerance Tables
Standard Dimensional Tolerance Table — Molded Rubber Products
Dimension Dimension(Inches) Fixed Closure (Millimeters) Fixed Closure
Above - Incl. Above - Incl.
HIGH PRECISIONDWG DESIGNATION A1
0 - .40 ±.004 ±.005 0 - 10 ±.10 ±.13.40 - .63 .005 .006 10 - 16 .13 .16.63 - 1.00 .006 .008 16 - 25 .16 .20
1.00 - 1.60 .008 .010 25 - 40 .20 .251.60 - 2.50 .010 .013 40 - 63 .25 .322.50 - 4.00 .013 .016 63 - 100 .32 .404.00 - 6.30 .016 .020 100 - 160 .40 .50
PRECISION
DWG DESIGNATION A2
0 - .40 ±.006 ±.008 0 - 10 ±.16 ±.20.40 - .63 .008 .010 10 - 16 .20 .25.63 - 1.00 .010 .013 16 - 25 .25 .32
1.00 - 1.60 .013 .016 25 - 40 .32 .401.60 - 2.50 .016 .020 40 - 63 .40 .502.50 - 4.00 .020 .025 63 - 100 .50 .634.00 - 6.30 .025 .032 100 - 160 .63 .80
6.30 & over — To find fixed 160 & over — To find fixeddimensional tolerances multiply by 0.4% dimensional tolerances multiply by 0.4%
Drawing Designation “A1" is the tightesttolerance classification and indicates a highprecision rubber product. Such productsrequire expensive molds, fewer cavities permold, costly in-process controls andinspection procedures. The exact method ofmeasurement should be agreed uponbetween rubber manufacturer and customer,as errors in measurement may be large inrelation to the tolerance.
Some materials, particularly those requiringpost curing, do not lend themselves toDrawing Designation “A1" tolerances.
Drawing Designation “A2" tolerancesindicate a precision product. Molds must beprecision machined and kept in good repair.Careful inspection will usually be required.
TECHNICAL INFORMATION AND REFERENCE
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Tolerance Tables
Standard Dimensional Tolerance Table — Molded Rubber Products
Dimension Dimension(Inches) Fixed Closure (Millimeters) Fixed Closure
Above - Incl. Above - Incl.
COMMERCIALDWG DESIGNATION A3
0 - .40 ±.008 ±.013 0 - 10 ±.20 ±.32.40 - .63 .010 .016 10 - 16 .25 .40.63 - 1.00 .013 .020 16 - 25 .32 .50
1.00 - 1.60 .016 .025 25 - 40 .40 .631.60 - 2.50 .020 .032 40 - 63 .50 .802.50 - 4.00 .025 .040 63 - 100 .63 1.004.00 - 6.30 .032 .050 100 - 160 .80 1.25
6.30 & over — To find fixed 160 & over — To find fixeddimensional tolerances multiply by 0.5% dimensional tolerances multiply by 0.5%
NON-CRITICALDWG DESIGNATION A4
0 - .40 ±.013 ±.032 0 - 10 ±.32 ±.80.40 - .63 .016 .036 10 - 16 .40 .90.63 - 1.00 .020 .040 16 - 25 .50 1.00
1.00 - 1.60 .025 .045 25 - 40 .63 1.121.60 - 2.50 .032 .050 40 - 63 .80 1.252.50 - 4.00 .040 .056 63 - 100 1.00 1.404.00 - 6.30 .050 .063 100 - 160 1.25 1.60
6.30 & over — To find fixed 160 & over — To find fixeddimensional tolerances multiply by 0.8% dimensional tolerances multiply by 0.8%
Drawing Designation “A3" tolerancesindicate a ”commercial" product and willnormally be used for most products.
Drawing Designation “A4" tolerances applyto products where dimensional control is non-critical and secondary to cost.
TECHNICAL INFORMATION AND REFERENCE
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Materials and Durometers
Material Designation BN Durometers 40 through 90*
BUNA-N (NITRILE) (NBR)The standard for most general applications:petroleum base lubricants, hydraulic oils,gasoline, fuels, alcohol, L.P. gases, waterand many other media. Temperature Range: -65 to +275° F (-55 to +135° C)* To specify compound, precede material with
Durometer. Example: 70BN
Material Designation EPDurometers 40 through 90*
ETHYLENE-PROPYLENE (EPDM)For hot water, steam, acids, alcohols, alkalis,keytones, phosphate esters, brake fluids,drive belts and exposure to oxygen, ozoneand weathering. Temperature Range: -67 to+302° F (-55 to +150° C)* To specify compound, precede material with
Durometer. Example: 70EP
Material Designation SDurometers 40 through 80*
SILICONECompatible with a variety of fluids, air,oxygen, ozone and other media for extremesof low and high temperature applications.Temperature Range: -85 to +450° F (-65 to+232° C)* To specify compound, precede material with
Durometer. Example: 70S
Material Designation CDurometers 40 through 90*
NEOPRENE (CHLOROPRENE) (CR)Recommended for refrigeration freon gases,carbon dioxide gases, chlorine, ozone,sunlight exposure and for use as drive belts.Temperature Range: -80 to +275° F (-60 to+135° C)* To specify compound, precede material with
Durometer. Example: 70C
Material Designation VDurometers 60 through 90*
FLUOROCARBONHigh temperature toughness, stability andcompatibility with a wide range of fluid andchemical types including acids, oils, fuels,solvents and gases. Temperature Range: -31to +400° F (-35 to +204° C)* To specify compound, precede material with
Durometer. Example: 75V
Material Designation FSDurometers 60 through 80*
FLUOROSILICONERecommended where extreme temperatureproperties are required. For petroleum oils,fuels and lubricants; synthetic ester anddiester lubricants. Temperature Range: -85 to+350° F (-65 to +177° C)* To specify compound, precede material with
Durometer. Example: 70FS
Material Designation TDurometer 85*
TEFLONRecommended for end-cap seals on valves,cylinders, filters, test vessels, flangedconnections, tube fittings and couplings. Willnot twist, chip, swell or shrink, and can besterilized. Temperature Range: 75° F to 400°F (60° C to 200° C)* To specify compound, precede material with
Durometer. Example: 85T
TECHNICAL INFORMATION AND REFERENCE
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Fluid Compatibility
Acetaldehyde U U R U R UAcetamide R U R R M UAcetic Acid M M R R R UAcetone U M R M M UAcetophenone U U R U U UAcetylene R R R R R RAmmonia R R R R R UAmmonium Hydroxide R R R R R RAmyl Acetate U U M U U UAnderol L-774 M U U U U RAntifreeze R R R R R RAniline U U R U U MAroclors M U R U M RAskarel R U U U U RASTM #1 R U U R R RASTM #3 R U U U U RASTM Fuel A R U U R U RASTM Fuel B R U U U U RASTM Fuel C R U U U U RASTM Fuel D M U U U U RAuto Transmission Fluid R U U M M RBeer R R R R R RBenzaldehyde U U R U U UBenzene U U U U U RBenzine R U U R U RBenzoic Acid U U U U U RBenzophenone U U R X U RBenzyl Alcohol U U R R X RBleach R R R R U RBorax R R R U R RBoric Acid R R R R R RBrake Fluid (non-petro.) U R R R R UBromine U U U U U R
Fluid
Fluo
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Silic
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Neop
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EPDM
Nitri
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Bromobenzene U U U U U RBunker Oil R U U U U RButane R M U R U RButter R U M R R RButyl Acetate U U U U U UButyl Alcohol R R R R R RButyl Amine M U U U R UButyl Carbitol U U R M U MButyl Cellosolve M U R M X UButyraidehyde U U R U U UCarbitol R R R R R RCarbitol Acetate U U U U U RCarbon Disulfide U U U U U RCarbon Tetrachloride R U U U U RCarbonic Acid R R R R R RCastor Oil R R R R R RCellosolve U R U U U UChassis Grease R U U M U RChloracetic Acid U U R U X UChloracetone U U R M U RChlordane R U U M U RChlorine U U R U X RChlorobenzol U U U U U RChloroform U U U U U RChlorosulfonic Acid U U U U U UChrome Plating Solution U U R U R RChromic Acid U U X U M RCitric Acid R R R R R RCod Liver Oil R U U R R RCoffee R R R R R RCorn Oil R U U U R RCreosote R U U R U RCreosote Oil R U U M M R
Fluid
Fluo
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Silic
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Neop
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EPDM
Nitri
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SBR
The recommendations shown in this table arebased on data supplied by polymermanufacturers, and comparison made withsimilar materials. These are general guidelinesonly and users must conduct their ownfunctional tests to determine the suitability ofany compound for their particular application.
To aid in your selection, materials are rankedin order of increasing cost with Nitrilescosting the least and Fluoroelastomerscosting the most.
Increasing CostR = Recommended M = Marginal U = Unsatisfactory X = Insufficient Data
TECHNICAL INFORMATION AND REFERENCE
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Fluid Compatibility
Creosylic Acid U U U U U RCrude Oil R U U U U RCyclohexane R U U M U RCyclohexanol R U U R U RDecalin U U U U U RDenatured Alcohol R R R R R RDiacetone U U R U U UDibutyl Amine U U U M U UDibutyl Phthalate U U R U X MDichloro Aniline U U U U U MDichloro Butane R U U U U RDiesel Oil R U U M U RDiethylamine R R R R R UDiethyl Benzene M U U U X RDiethylene Glycol R R R R R RDimethyl Ether U U U M U UDimethyl Formamide U X R X R UDimethyl Phthalate U U R U X RDimethyl Terephthalate U U U U U RDioctyl Phthalate U U R U M RDioxane U U R U U UDiphenyl U U U U U RDow Corning 550 R R R R R RDow Gard R R R R R RDowtherm A & E U U U U U RElco 28 R U U M R REpoxy Resins X X R R X UEthane R U U R U REthanol R R R R R REthanolamine R R R R R UEther M U M U U UEthyl Acetate U U R U R UEtnyl Benzene U U U U U REthyl Cellulose R R R R R UEthyl Chloride R R R R U REthly Ether M U M U U UEthyl Formate U U R R X REthyl Hexanol M R R R X REthyl Merlaptan U U X M M REthylene Chloride U U U U U REthylene Oxide U U R U U UFormaldehyde M M R M R UFormic Acid M R R R M UFreon 12 R R R R U R
Fluid
Fluo
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Silic
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Neop
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EPDM
Nitri
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SBR
Fuel Oil R U U R U RFufuryl Alcohol U U R U U XFuran U U X U X XFurfural U U R U U UFyrquel U U R U R RGallic Acid R R R R X RGasoline R U U U U RGelatin R R R R R RGlucose R R R R R RGlycerine R R R R R RHeptane R U U R U RHexaldehyde U U R R R UHexane R U U R U RHexanol R R M R R RHome Heating Oil R U U M R RHydrazine R R R R R XHydrochloric Acid R M R R U RHydrocyanic Acid R R R R M RHydrogen Peroxide R R R R R RHydrogen Sulfide U U R R M UHydroquinone M U U U X RHypoid Gear Lube R U U M M RIodine R R R U X RIsocyanate X X X X X RIso Octane R U U R U RIsopar R X U R U RIso Phorone U U R U U UIsopropanol R R R R R RIsopropyl Acetate U U R U U UJP-4 (MIL-J-5624) R U U U U RJP-5 (MIL-J-5624) R U U U U RKerosine R U U R U RLacquers U U U U U ULactic Acid R R R R X RLard R U R R R RLinoleic Acid R U U R R RLinseed Oil R U M M R RLye Solutions R R R R R RMalathion R U U X U RMaleic Acid U U U U X RMercury R R R R X RMeter-Cresol U U U R U RMethacrylic Acid U U R R U MMethane R U U R U R
Fluid
Fluo
roel
asto
mer
Silic
one
Neop
rene
EPDM
Nitri
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SBR
Increasing CostR = Recommended M = Marginal U = Unsatisfactory X = Insufficient Data
TECHNICAL INFORMATION AND REFERENCE
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Fluid Compatibility
Methanol R R R R R UMethyl Acetate U U R R U UMethyl Cellosolve M U R M U UMethylene Chloride U U U U U RMethyl Ethyl Ketone U U R U U UMethyl Mercaptan X X R X X XMilk R R R R R RMineral Oil R U M R R RMineral Spirits R U U U U RMonovinyl Acetylene R R R R R RMustard X R R X R RNaphtha R U U U U RNaphthalene U U U U U RNaphthenic Acid R U U U U RNatural Gas R R U R R RNeatsfoot Oil R U R U R RNitric Acid U M R U U MNitrobenzene U U U U U RNitropropane U U R U U UOctane R U U U U ROctanol R R R R R ROleic Acid M U U M U ROleum R U U M U ROronite 8200 R U U R U ROxalic Acid R R R R R RPeanut Oil R U M M R RPentane R M U R U RPerchlorethylene R U U U U RPetroleum Ether U U U U U RPhenol U U U U U RPhenylhydrazine U M U U X RPhosphoric Acid R R R R R RPine Oil R U U U U RPotassium Hydroxide R R R R M UPropane R U U R U RPropanol R R R R R RPropyl Acetate U U R U U UPydraul U U R U U R
Fluid
Fluo
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Silic
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Neop
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EPDM
Nitri
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Pyranol R U U R U RPyridine U R U U U URapeseed Oil R U R R U RResurcinol X R R X X XSAE10W30 R U U M R RSeawater R R R R R XSilicone Grease R R R R R RSilver Nitrate R R R R R RSkelly Solvent R U U U X RSkydrol U U R U U RSkydrol 500 U U R U U USodium Hydroxide R R R R U RSovasol R U U R R RSoy Bean Oil R U M M R XStearic Acid R R R R X XStoddard Solvent R U U R R RSucrose R R R R U USulfuric Acid R R R R R UTall Oil R U U M R UTannic Acid R R R R U XTar R U U M U XTartaric Acid R R R R X XTetrachloro Ethane U U U U U UTetralin U U U U U UTidewater Oil R U U R R RToluene U U U U U UTrichloro Ethylene M U U U U UTriethanol Amine M R R R U UTurbine Oil R U U U R RTurpentine R U U U R UUCDN 50HB280X R R R R X XUnivis J-43 R U U R R RVarnish R U U U U MVinegar R R R R U UWater R R R R U UWheat Germ Oil R U U M R RWhiskey & Wine R R R R U UWood Oil R U U R X M
Fluid
Fluo
roel
asto
mer
Silic
one
Neop
rene
EPDM
Nitri
le
SBR
Increasing CostR = Recommended M = Marginal U = Unsatisfactory X = Insufficient Data
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Comparison of Properties
Ozone resistance P P GE E E E EWeather resistance F F E E E E EHeat resistance G FG G E E E EChemical resistance FG FG FG E E E GEOil resistance E P FG P E G PGImpermeability G F G G G P PCold resistance G G FG G FP GE ETear resistance FG FG FG G F P P
Property
Fluo
roca
rbon
Silic
one
Neop
rene
Ethy
lene
Pro
pyle
ne
Nitri
le
SBR
Fluo
rosi
licon
e
Abrasion resistance G G G G G P PSet resistance GE G F G GE GE GEDynamic properties GE G F G GE P PAcid resistance F F FG G E FG FGTensile strength GE GE G G GE F PElectrical properties F G F G F E EWater/Steam resistance FG FG F E FG F FFlame resistance P P G P E G F
Property
Fluo
roca
rbon
Silic
one
Neop
rene
Ethy
lene
Pro
pyle
ne
Nitri
le
SBR
Fluo
rosi
licon
e
This chart matches the general rubberproperties required in most applications withthe capabilities of commonly usedelastomers. Since no one elastomer is rated“excellent” for all properties, compromises
are sometimes necessary when selecting anelastomer for a specific application. Startwith the most critical properties to narrowyour choices.
E = Excellent G = Good F = Fair P = Poor
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Temperature Range
The temperature range for any compound isdetermined by the base elastomer used. Thischart depicts the maximum temperaturerange for each elastomer. The temperature
range for a specific compound may notreach these maximum limits. Highertemperatures may be considered if exposureis short term or intermittent.
250
200
150
100
50
0
-50
482
392
302
212
122
32
-58
Deg
rees
Cel
sius
NIT
RIL
E
NE
OP
RE
NE
ET
HY
LEN
E P
RO
PY
LEN
E
FLU
OR
OC
AR
BO
N
SIL
ICO
NE
FLU
RO
SIL
ICO
NE
ST
YR
EN
EB
UTA
DIE
NE
PO
LYC
RY
LAT
E
-65˚C-85˚F
-54˚C-65˚F
Deg
rees
Fah
renh
eit
-35˚C-31˚F
-55˚C-67˚F
-18˚C-0˚F
135˚C275˚F
149˚C300˚F
204˚C400˚F
232˚C450˚F
177˚C350˚F
177˚C350˚F
107˚C225˚F
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Durometer
The hardness of rubber compounds ismeasured by the Shore A durometer; thehigher the durometer number, the harder thecompound, 70-durometer hardness should beused wherever possible as it offers the bestcombination of properties for most O-Ringapplications. Softer compounds stretch easier
and seal better on rough surfaces. Hardercompounds offer greater abrasion resistanceand resistance to extrusion. Extrusion mustalways be considered where high pressuresare used. The proper hardness may beselected from this chart by matching the fluidpressure with the maximum extrusion gap.
90
80
70
60
.020 .030.010 .040
Maximum Gap-Inches
Flu
id P
ress
ure
- P
SI
10,000
9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
900
800
700
600
500
400
300
100
200