Elastomers (Rubber Compounds) for Diaphragms

Elastomers For Diaphragms

Dia•Com 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.

Dia•Com 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 EN-549 ceritficate:   English | Deutsche

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 Dia•Com 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-Excel


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


Poor


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