Valves - diaphragms

EPDM and EPDM plus diaphragms


EPDM and EPDM plus diaphragms

Ethylene propylene diene monomer (EPDM) is fairly chemical resistant and offers quality performances in applications with repetitive steam-in-place (SIP) cycles.

We currently have two types of EPDM diaphragm available:

  • EPDM a relatively low cost material widely used in pharmaceutical applications
  • EPDM Plus a Parylene surface treated version which improves the longevity of the EPDM and greatly reduces the stickiness of the diaphragm.

Features and benefits

  • All our diaphragms are laser-etched with cure dates and batch numbers, ensuring that they are completely traceable
  • Wide temperature range; good in steam applications
  • Not suitable for use with solvents or petroleum agents
  • Parylene surface treated version available

Technical summary

Diaphragm variant(s)Bellows, Parylene surface, Straight 
Compatible actuatorsAJS, AKS, AKS (0.5", 1", 1.5") 
Material specificationEPDM with Parylene surface treatment, Ethylene propylene diene monomer (peroxide cured) 
StandardsASME BPE, USP VI 

Technical Summary table lists features available within the range. See ‘Technical specifications’ tab for model specific information.


Technical specifications

EPDM diaphragmsEPDM plus diaphragms
Sizes0.5", 0.75", 1.0", 1.5", 2.0", 3.0", 4.0" 0.5", 0.75", 1.0", 1.5", 2.0", 3.0" 
ColorBlack Black 
Diaphragm variant(s)Bellows, Parylene surface, Straight Parylene surface, Straight 
Parylene treatmentNo, Yes No, Yes 
Max. operating temperature135 °C135 °C
Min. operating temperature-51 °C-35 °C
Max. operating temperature275 °F275 °F
Min. operating temperature-60 °F-30 °F
Compatible actuatorsAJS, AKS, AKS (0.5", 1", 1.5") AJS, AKS, AKS (0.5", 1", 1.5") 
Material specificationEthylene propylene diene monomer (peroxide cured) EPDM with Parylene surface treatment 

Materials of construction

MaterialEPDM, EPDM Plus



  1. ASEPCO valves (US).pdf
    PDF - 722.5kb


  1. ASEPCO diaphragms datasheet.pdf
    PDF - 234.5kb

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