SISTO C, TFM / EPDM-bonded Diaphragm

Excellent chemical and thermal properties

The TFM’s excellent chemical and thermal properties make this diaphragm type of SISTO the first choice for applications with chemically aggressive media and high temperatures. This diaphragm type is also recommended for use in media which need to be protected against rubber abrasion and fluids containing oils and greases. As the rubber is fully covered by the TFM sheet, even mechanical damage to the sheet does not result in cavity formation and therefore to undefined spaces which cannot be cleaned. This composite diaphragm is vacuum-resistant.

Technical data

Sizes DN6 – DN80
Temp. range -30⁰C - 120⁰C (short-term 140⁰C)
Connections Threaded pin
Material EPDM Rubber bonded to TFM film
Certificates USP Class VI, 3.1b, FDA, EG1935


 Tightening torques chart

DiapphragmMD (Membrane Diameter)
30 40 65 92 115 168 202 280
EPDM 1,5 3 8 12 14 18 32 40
TFM bonded 1,5 3,5 8 12 18  
PTFE, TFM (2-piece) 2 4 10 18 30 40 60 75