Dia•Com has developed an extensive inventory of 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.

View our approval on the NSF web site; Click here: http://www.nsf.com/Certified/PwsComponents/Listings.asp?Company=1C310&Standard=061

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

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
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
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
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
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 membrane GPL, LPG / Methan Membranen, membranes pour GPL/méthane