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Elastomer & Material Specifications

Technical information regarding various parts and products. Click on the links below to quickly jump to each section:

Properties of Elastomers

PropertyNatural RubberNitrileNeopreneEthylene Propylene (EPDM)

Basic Properties

Hardness Range20-9020-9510-9530-90
Tear ResistanceGoodFairGoodGood
Abrasive ResistanceExcellentGoodExcellentGood
Compression SetGoodGoodFair to GoodGood
Permeability to GasesFairFairLowFair to Poor

Acid Resistance

DiluteFair to GoodGoodVery GoodExcellent
ConcentratedFair to GoodGoodGoodGood

Solvent Resistance

Aliphatic HydrocarbonsPoorExcellentGoodPoor
Aromatic HydrocarbonsPoorGoodFairPoor
Oxygenated (ketones, etc.)GoodPoorPoorGood
Lacquer SolventsPoorFairPoorGood
Swelling in Lubricated OilPoorVery GoodGoodPoor

Resistance

Oil and GasolinePoorExcellentGoodPoor
Water AbsorptionVery GoodFair to GoodGoodExcellent
OzoneFairFairExcellentExcellent
SunlightPoorPoorVery GoodVery Good
Temperature Range (°F)-67 to +194-40 to +212-40 to +212-58 to +302
Major AttributesResilienceOil ResistanceOil & Gas Resistance,
Weatherability
General Purpose

PropertySiliconeUrethane RubberVitonFluorosilicone

Basic Properties

Hardness Range10-8510A-80D50-9540-80
Tear ResistancePoorExcellentFairFair
Abrasive ResistancePoorOutstandingGoodGood
Compression SetFairGoodVery GoodFair
Permeability to GasesFairFairVery LowLow

Acid Resistance

DiluteFairPoorExcellentGood
ConcentratedFairPoorExcellentFair

Solvent Resistance

Aliphatic HydrocarbonsPoorExcellentExcellentFair
Aromatic HydrocarbonsPoorFair to GoodExcellentFair
Oxygenated (ketones, etc.)FairPoorPoorPoor
Lacquer SolventsPoorPoorPoorPoor
Swelling in Lubricated OilFairExcellentExcellentGood

Resistance

Oil and GasolineFairExcellentExcellentGood
Water AbsorptionGoodGood @ 70°F,
Poor @ 212°F
Very GoodVery Good
OzoneExcellentOutstandingExcellentExcellent
SunlightExcellentGoodVery GoodVery Good
Temperature Range (°F)-76 to +392-13 to +212-4 to +392-76 to +347
Major AttributesHeat ResistanceAbrasion Resistance,
Load-Bearing Characteristics
Heat Resistance,
Excellent Solvent & Chemical Resistances
Low Temperature
Flexibility, Fluid & Ozone Resistance

Material Specification Sheets

Below are specification sheets on the materials we use in our o-rings and gaskets. Information additional to what is listed in the table above can be found below.

Buna-N (FDA and USDA Compliant) Product Specification

Common Name: Buna N, Nitrile, NBR
Trade Names: Oil Ace: Compound No. AX-41060, Mincar: Compound No. 4045
ASTM D-2000 Classification: BF, BG, BK
Military (MIL STD 417): SB
Chemical Definition: Butadiene Acrylonitrile

Tensile Strength (PSI): 200-3000
Elongation (Max %): 600
Adhesion to Metals: Good to Excellent

Nitrile (Buna-N) is a general purpose oil resistant polymer which has good solvent, oil, water and hydraulic fluid resistance, good compression set, abrasion resistance and tensile strength. Nitrile should not be used in highly polar solvents such as acetone, and MEK, ozone, chlorinated hydrocarbons and nitro hydrocarbons.

EPDM (FDA & USDA Compliant) Product Specification

Common Name: EPR, EPT, EPDM
Trade Names: Resist-O (Nordel®): Compound No. AX-60660

ASTM D-2000 Classification: CA
Military (MIL STD 417): RS
Chemical Definition: Ethylene Propylene

Tensile Strength (PSI): 500-2500
Elongation (Max %): 600
Adhesion to Metals: Fair to Good

Ethylene Propylene is a polymer with outstanding properties. It has exceptionally good weather aging and ozone resistance; excellent water and chemical resistance; excellent resistance to gas permeability, and excellent resistance to aging due to exposure to steam and heat; resistance excellent up to 350°F. Ethylene Propylene is a polymer with poor resistance to oil, fats and some solvents, however, it is fairly good in ketones and alcohols. It is not recommended for exposure to aromatic hydrocarbons.

Silicone (FDA Class VI Compliant) Product Specification

Common Name: Silicone
Trade Names: Thermoflex: Compound No. 2850R

ASTM D-2000 Classification: FC, FE, GE
Military (MIL STD 417): TA
Chemical Definition: Polysiloxane

Tensile Strength (PSI): 200-1500
Elongation (Max %): 700
Adhesion to Metals: Good

Silicone Rubber has a great many variations and can be compounded to meet any number of applications. Silicone can be compounded to have tensile strength in the area of 1500 PSI and tear resistance up to 200 lbs; low compression set and good resilience; moderate solvent resistance; excellent heat resistance; good release characteristics; extreme low temperature properties; and can be highly resistant to oxidation and ozone attack. Silicone is generally attacked by most concentrated solvents, oils, concentrated acids and dilute sodium hydroxide.

PTFE (FDA and USDA Compliant) Product Specification

Common Name: Fluoropolymer Resin

Chemical Definition: Polytetrafluoroethylene

Durometer Range (Shore A): 95-100
Tensile Range (PSI): 3500-4500
Elongation (Max %): 250-350
Compression Set: Good
Resilience – Rebound: Fair
Abrasion Resistance: Excellent
Tear Resistance: Excellent
Solvent Resistance: Excellent
Oil Resistance: Excellent
Low Temperature Usage (°F): -425 to -350
High Temperature Usage (°F): 400 to 500 depending on time and service condition
Aging Weather – Sunlight: Excellent
Adhesion to Metals: Good

Fluoropolymers have good heat resistance up to 500°F, and resistance to a wide range of oils and solvents. They also have excellent resistance to oxidation, ozone and steam at 300°F. They are inert to most industrial chemicals and have the lowest coefficient of friction of any solid material.

Viton (FDA Class VI Compliant) Product Specification

Common Name: Fluoro Elastomers
Trade Names: Viton® Fluorel® Vi-Chem: Compound No. EV-9970

ASTM D-2000 Classification: HK
Military (MIL STD 417): MIL-R-25897 and MIL-R-83248
Chemical Definition: Fluorinated Hydrocarbon

Tensile Strength (PSI): 500-2000
Elongation (Max %): 300
Adhesion to Metals: Good

Fluoro Elastomers have heat resistance up to 600°F, and resistance to a wide range of oils and solvents: especially all aliphatic, aromatic and halogenated hydrocarbons, acids, and vegetable oils. Vi-Chem is not recommended for ketones, low molecular weight esters and nitro-containing compounds.

Black Buna Product Specification

ASTM DesignationPropertiesASTM D2000 SpecsLaboratory Properties
Durometer (Shore A)70 ±572
Tensile (PSI, Mpa) Min.2031 (14)2420 (17)
Elongation, Min %250310
Specific Gravity-1.24
Heat Age 70 hrs @ 100°C
Durometer Change, Points±15+3
Tensile Strength Change, Max %±15+7
Elongation Change, Max %-50-21
B14Compression Set 22 hrs @ 100°C
Original Deflection, Max %2518
EA14Water Resistance, 70 hrs @ 100°C
Durometer Change Points±10+2
Volume Change, %±15+6.2
F17Low Temperature Brittleness
ASTM D2137, Method A, 9.3.2, 3 Minutes @ -40°CNon-BrittlePass

Specifications Met:

  • ASTM D2000-01 Grade M 2 BG714 B14 EA14 F17
  • FDA CFR 177.2600

Manufacturer’s Cross Reference: N168-60 is designed to meet or exceed the properties of these popular Nitrile Compounds: N1069-70, N508-75, 7077, C22-70, 2068-70, H14100 and 275B.

This special Black Color FDA Grade Nitrile (Buna-N) is acceptable for use over a temperature range of -40°F to +250°F. The ingredients are listed in the U.S. Code of Federal Regulations (21 CFR 177.2600) as being acceptable for repeated use in contact with food.

Black EPDM Product Specification

ASTM DesignationPropertiesASTM D2000 SpecsLaboratory Properties
Durometer (Shore A)70 ±571
Tensile (PSI, Mpa) Min.2031 (14)2140 (14.8)
Elongation, Min %200310
Specific Gravity-1.14
A25Heat Age 70 hrs @ 125°C
Durometer Change, Points+10+4
Tensile Strength Change, Max %-20-3
Elongation Change, Max %-40-16
B35Compression Set 22 hrs @ 125°C
Original Deflection, Max %5042
C32Resistance to Ozone
ASTM D1171, Method BPassPass
EA14Water Resistance, 70 hrs @ 100°C
Volume Change±5+1.6
F17Low Temperature Brittleness
ASTM D2137, Method A, 9.3.2Non-BrittlePass
G21Tear Resistance
Method D624, Die C, min kN/m2638

Specifications Met:

  • ASTM D2000-01 Grade M 5 CA714 A25 B35 C32 EA14 FG21
  • ASTM D2000-75 Grade 5 CA720 A25 B35 C32 L14 F17 G21
  • FDA CFR 177.2600

Manufacturer’s Cross Reference: E300-70 is designed to meet or exceed the properties of these popular EPDM Compounds: E603-70, E1028-70, 3077, E14, E17016, 5601-70 and 559N.

Sulfur Cured EPDM Compound Systems have a temperature use range of -65°F to +300°F. Sulfur-Cured EPDM is the least costly and provides the best Tear and Abrasion Resistance compared to Peroxide-Cured Systems. EPDM Compounds are frequently used with foods, water and steam applications and offer the best resistance to ozone and weathering. EPDMs are not used with petroleum oils or fuels because significant swelling would result.

Brown Viton Product Specification

ASTM DesignationPropertiesASTM D2000 SpecsLaboratory Properties
Durometer (Shore A)75 ±576
Tensile (PSI, Mpa) Min.1450 (10)1773 (12)
Elongation, Min %150160
Specific Gravity-2.02
A1-10Heat Age 70 hrs @ 250°C
Durometer Change, Points+10+2
Tensile Strength Change, Max %-25+4
Elongation Change, Max %-25-8
B38Compression Set 22 hrs @ 200°C
Original Deflection, Max %1513.9
C12Resistance to Ozone
ASTM D1171, Method BNo CracksPass
C20Resistance to Outdoor Aging
ASTM D1171No CracksPass
EF31Fuel Age, 70 hrs @ 23°C in Reference Fuel C
Durometer Change, Points±5-1
Tensile Change, Max %-25-14
Elongation Change, Max %-20-12
Volume Change, %0/+10+3
EO88Fuel Age, 70 hrs @ 200°C in Stauffer 7700/SAE
Fluid No. 2
Durometer Change, Points-15/+5-6
Tensile Change, Max %-40-21
Elongation Change, Max %-20-14
Volume Change, Max %+25+8
F15Low Temperature Brittleness
ASTM D2137 Method A, 9.3.2, 3 mins @ -25°CNon-BrittlePass

Specifications Met:

  • ASTM D2000-99 Grade M 6 HK810 A1-10 B38 C12 C20 EF31 E088 F15

These compounds offer the best resistance to a combination of chemicals, weather, and compression set over a temperature range of -20°F to +400°F. The ingredients in are listed in the U.S. Code of Federal regulations (21 CFR 177.2600) as being acceptable for repeated use in contact with food. Compound is brown in color.

FDA Red Silicone O-Rings Product Specification

ASTM DesignationPropertiesASTM D2000 SpecsLaboratory Properties
Durometer (Shore A)70 ±571
Tensile (PSI, Mpa) Min.870 (6)995 (6.9)
Elongation, Min %150175
Specific Gravity-1.43
A19Heat Age 70 hrs @ 225°C
Durometer Change, Points+10+4
Tensile Strength Change, Max %-25-14.3
Elongation Change, Max %-30-18.4
B37Compression Set 22 hrs @ 175°C
Original Deflection, Max %2512.4
Compression Set 70 hrs @ 150°C
Original Deflection, Max %-19.4
E016ASTM #1 Oil, 70 hrs @ 150°C
Durometer Change, Points0/-15-7
Tensile Change, Max %-20-2.9
Elongation Change, Max %-200
Volume Change0/+10+6.4
E036ASTM #3 Oil, 70 hrs @ 150°C
Durometer Change, Points-30-20
Volume Change, Max %+60+35
EA14Water Resistance, 70 hrs @ 100°C
Durometer Change, Points±5-1
Volume Change, %±5+2.5
F19Low Temperature Brittleness
ASTM D2137 Method A, 3 mins @ -55°CNon-BrittlePass
ASTM D2137 Method A, 3 mins @ -65°C-Pass
G11Tear Resistance Die B ppi (kN/m)51 (9)107 (18.8)

Specifications Met:

  • ASTM D2000-01 Grade M 5 GE706 A19 B37 E016 E036 EA14 F19 G11
  • ZZ-R-765B Class 2a and 2b, grade 70 and FDA CR 177.2600
  • AMS 3304 (Size per AS3582 which replaced MS9068)

Silicones offer a broad temperature range from -80°F to +400°F and excellent dry heat resistance. Our Silicone Compounds are inert and guarantee complete compliance to ASTM, and Military, and FDA Specifications required by food, medical, electrical and filter manufacturers. They are not used in dynamic seals because of relatively poor tensile, tear and abrasion resistance.

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