MA 08 – PTFE backed EPDM – SED Diaphragm

DN 8-15 Molded open


  • highest degree of chemical resistance
  • increased stability
  • longer flex life, less porosity
  • reduced cold flow
  • superior performance through temperature fluctuations between hot and cold and steam sterilization cycles.
  • Batch traceable by a set of unique codes molded into the diaphragm dvary.







The diaphragm is the most important component of the diaphragm valve. Besides the valve body, the diaphragm is the only part which contacts the process medium. It is the dynamic part with which the flow rate of the process medium is controlled and/or stopped.


The PTFE MA 8 consists of a separate EPDM backing cushion and a PTFE diaphragm. It is designed as a one-piece diaphragm, which means that the EPDM backing is bonded with the PTFE. The diaphragm is always manufactured and molded in the open position. These one-piece diaphragms have less surface area and are subject to shorter linear strokes. The MA-8 diaphragm incorporates an elastomer button for assembly with the valve operating mechanism. This eliminates the potential for point loading at the center of the diaphragm.

Suitable for diaphragm valves: KMA 205, KMA 190, Steripur 206, Steripur 217.25, Steripur 217.30
SED Articlenumber: 00210.190.508.51 PTFE/EPDM


Technical information

SizesDN8 to DN15, IMP 1/4″- 1/2″
Temp. range-20°C to 150°C
MaterialPTFE backed EPDM Diaphragm (bonded)
CertificatesFDA, USP Class VI 121 ºC, {87}, {88}, TSE/BSE (ADCF), 3-A Sanitary Class II and III, Extractable organic substances (ISO 10993-18)