Diaphragm materials 

NBR (Buna-N)
The most widely used standard material. A special SUCO material mixture, which shows good low temperature flexibility, so that even at low temperatures, the tightness of the pressure switch is maintained. 
Suitable for hydraulic / machine oil, heating oil, air, nitrogen, etc. [-40ºC  -  +100ºC]

EPDM
Ideal for those applications with brake fluid. In addition, particularly suitable for applications in which (grey) water is used. For oxygen applications, there exists an approval from the BAM (Federal Institute for Material Testing). Oils must not come in contact with EPDM as this may cause swelling and softening of the material.
Suitable for water, hydrogen, ozone, acetylene, brake fluid, etc. [-30ºC  - +120ºC]

FKM (Viton ®)
A diaphragm material that is suitable for high temperature stress and has special chemical resistance properties. It has been tested in the hydraulic sector and has been proven to work successfully with critical oils.
Suitable for hydraulic fluids (HFA, HFB, HFD), synthetic oils, petrol, gasoline, etc. [-5ºC  -  +120ºC]

Silicone
Silicone is applicable for use in an extensive temperature range. The SUCO Silicone diaphragm is FDA-approved (Food & Drug Administration) for the food sector. Silicone is a soft material that is reserved for sensitive low pressure applications under 10 bar. 
Suitable for air, water [-40ºC  -  +120ºC]

H-NBR
A special SUCO material mixture optimized for ester-based bio-oils. Due to the multitude of bio-oils on the market, the suitability of the material for each oil must be determined. This diaphragm material can also be used for a variety of mineral and synthetic oils. 
Suitable for bio oil, hydraulic oil, synthetic ester [-30ºC  -  +120ºC]

Gas applications
Due to their lower leakage, diaphragm pressure switches are more suitable for gas applications than piston-type pressure switches.
Please consult us if you have gas applications.

Oxygen applications
When using oxygen, the relevant regulations for the prevention of accidents have to be observed. We recommend not to exceed the maximum working pressures.
Please consult us if you have oxygen applications.

It is the responsability of the user to test the suitability of our products for the the particular application (verfication of material compatibility) and use may only be appropriate if proven in field tests.