Elastomers For Diaphragms

DiaCom has developed an extensive inventory of elastomers (rubber compound) formulations to meet the demands of a wide range of rolling diaphragm applications and maintains a full-time Rubber Chemist on-staff, constantly working to develop rubber formulations to meet the demands of an ever-changing industry.

DiaCom works with all types of rubber materials, such as Nitrile, EPDM, Neoprene, Fluorosilicone, Silicone, SBR, Fluoroelastomers (Viton®), Hydrin and Vamac®. Specialty compounds have been developed that include FDA grade, chloramine resistant compounds NSF 61 approved , and UL-157 and EN-549 approved for use in propane.

Certifications & Approvals:

View our ANSI/NSF STANDARD 61 certificate
View our UL 157 JMST2 certificates
View our UL 157 JMLU2 certificate
View our WRAS certificate

View EN-549 ceritficate

Rubber has a variety of physical properties, such as tensile strength, elongation, modulus, compression set, and tear resistance, as well as chemical compatibility. All of these properties must be considered when selecting a rubber to be used in a rolling diaphragm. Contact a DiaCom representative for proper rubber selection.

 

Chemical Compatibility Tables

Physical Properties

Elastomer Type
(ASTM Designation)
Butyl
(IIR)
Ethylene
Propylene
(EPDM)
Fluoro-
Carbon
(FKM)
Fluoro-
Silicone
(FVMQ)
Hydrin
(CO/ECO)
Neoprene
(CR)
Nitrile
(NBR)
Silicone
(VMQ)
Styrene
Butadyene
(SBR)
Compression Set
Resistance
Good
Fair
Good-Excel
Fair-Good
Fair-Good
Fair-Good
Good
Good-Excel
Good
Durometer Range
(Shore A)
30-100
30-90
50-95
35-80
30-95
40-95
20-90
25-90
40-100
Elongation %
300-800
200-800
100-450
100-500
300-400
650-850
400-600
90-900
400-550
Tensile Strength
(PSI)
2,000+
1,500-3,000
1,500-3,000
350-850
1,500-2,000
2,000-3,000
1,000-3,500
600-1,500
2,000+
Nitrogen Permeability
Resistance
Excellent
Good
Excellent
Poor
Excellent
Fair
Good
Poor
Fair
Resilience
Excellent
Good
Fair
Good
Good
Excellent
Good
Poor-Excel
Good

 

Mechanical Resistance Properties

Elastomer Type
(ASTM Designation)
Butyl
(IIR)
Ethylene
Propylene
(EPDM)
Fluoro-
Carbon
(FKM)
Fluoro-
Silicone
(FVMQ)
Hydrin
(CO/ECO)
Neoprene
(CR)
Nitrile
(NBR)
Silicone
(VMQ)
Styrene
Butadyene
(SBR)
Abrasion
Good
Good
Good
Fair
Fair-Good
Good
Excellent
Poor-Excel
Excellent
Electrical
Properties-
Insulating
Good
Excellent
Fair
Excellent
Poor-Fair
Fair
Fair
Excellent
Excellent
Electrical
Properties-
Conductive
Fair
Poor
Excellent
Poor
Excellent
Fair
Fair
Poor
Poor
Impact
Good
Good
Poor-Good
Fair
Good
Good
Fair
Poor-Good
Excellent
Tear
Good
Poor
Poor-Good
Fair
Good
Good
Good
Poor-Good
Fair

 

Temperature Resistance Properties

Elastomer Type
(ASTM Designation)
Butyl
(IIR)
Ethylene
Propylene
(EPDM)
Fluoro-
Carbon
(FKM)
Fluoro-
Silicone
(FVMQ)
Hydrin
(CO/ECO)
Neoprene
(CR)
Nitrile
(NBR)
Silicone
(VMQ)
Styrene
Butadyene
(SBR)
Cold Termperature
Flexibility
Good
Good
Fair-Good
Good
Good
Fair
Good
Excellent
Good
Flame
Retardance
Poor
Poor-Fair
Excellent
Outstanding
Fair
Good
Poor-Fair
Fair-Poor
Poor
Heat Aging
Good
Excellent
Outstanding
Outstanding
Excellent
Good
Good
Excellent
Good

 

Environmental Resistance Properties

Elastomer Type
(ASTM Designation)
Butyl
(IIR)
Ethylene
Propylene
(EPDM)
Fluoro-
Carbon
(FKM)
Fluoro-
Silicone
(FVMQ)
Hydrin
(CO/ECO)
Neoprene
(CR)
Nitrile
(NBR)
Silicone
(VMQ)
Styrene
Butadyene
(SBR)
Ozone
Good
Excellent
Outstanding
Outstanding
Excellent
Excellent
Poor
Excellent
Poor
Radiation
Fair-Good
Poor
Fair-Good
Good-Excel
Fair
Fair-Good
Fair-Good
Fair-Good
Good
Weather
Excellent
Excellent
Excellent
Outstanding
Good
Excellent
Good
Excellent
Fair

 

Chemical Resistance Properties

Elastomer Type
(ASTM Designation)
Butyl
(IIR)
Ethylene
Propylene
(EPDM)
Fluoro-
Carbon
(FKM)
Fluoro-
Silicone
(FVMQ)
Hydrin
(CO/ECO)
Neoprene
(CR)
Nitrile
(NBR)
Silicone
(VMQ)
Styrene
Butadyene
(SBR)
Acid-Dilute
Concentration
Fair
Good-Excel
Fair-Good
Good-Excel
Fair-Good
Good-Excel
Fair-Good
Fair-Good
Fair-Good
Aliphatic
Hydrocarbons
Poor
Poor
Excellent
Excellent
Excellent
Good
Excellent
Poor-Fair
Poor
Alkali-Dilute
Concentration
Fair-Good
Good-Excel
Good-Excel
Good-Excel
Fair-Good
Good-Excel
Good-Excel
Good-Excel
Fair-Good
Aromatic
Hydrocarbons
Poor
Poor
Excellent
Good-Excel
Excellent
Fair
Fair-Good
Poor
Poor
ATF Type A
Poor
Poor
Excellent
Excellent
Good
Good
Excellent
Good
Poor
Chlorinated
Hydrocarbons
Poor
Poor
Excellent
Good-Excel
Good-Excel
Poor
Fair-Good
Poor
Poor
Diesel Oil
Poor
Poor
Excellent
Good
Excellent
Fair
Good-Excel
Poor
Poor
Diester
Lubricants
Poor
Poor
Excellent
Excellent
Good
Poor
Fair-Good
Poor
Poor
EP Lubricants
Poor
Poor
Excellent
Excellent
Poor
Poor-Fair
Fair
Good
Poor
Ethyl Alcohol
Fair
Good-Excel
Excellent
Excellent
Good
Excellent
Good
Excellent
Fair
Ethylene Glycol
Excellent
Excellent
Excellent
Excellent
Excellent
Excellent
Excellent
Excellent
Good
Ethylene
Glycol/Water
Fair-Good
Good
Good
Good
Fair
Good
Good
Excellent
Good
Gasoline
Poor
Poor
Excellent
Excellent
Good-Excel
Fair
Good-Excel
Poor
Poor
Hydraulic
Fluids-Petroleum
Base
Poor
Poor
Excellent
Excellent
Excellent
Poor-Fair
Fair-Good
Poor
Poor
Hydraulic
Fluids-Silicate
Ester
Fair
Poor
Excellent
Outstanding
Fair-Good
Good
Good
Poor
Poor-Fair
Hydraulic
Fluids-Phosphate
Ester
Good
Good
Poor
Poor
Poor
Fair
Good
Poor
Ketones
Good
Fair-Excel
Poor
Poor
Fair
Fair
Poor
Fair-Good
Good
Lubricating
Oils-High
Aniline
Fair
Poor
Excellent
Excellent
Excellent
Good
Good-Excel
Good
Poor
Lubricating
Oils-Low
Aniline
Good
Poor
Excellent
Excellent
Excellent
Fair
Fair-Excel
Poor-Fair
Poor
Silicone Oil
Good
Excellent
Excellent
Excellent
Excellent
Excellent
Good
Poor
Good
Steam-Above
250°F (121°C)
Poor-Fair
Excellent
Fair
Poor-Fair
Poor
Fair
Fair
Poor-Fair
Poor-Fair
Water-212°F
(100°C)
Good
Excellent
Excellent
Excellent
Good
Good
Excellent
Excellent
Excellent

 

 

 

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