SICHEM® DIAPHRAGM is a flat gasket sheet made of pure multidirectional modified PTFE. These structured sheets provide enhanced performance compared to virgin PTFE. The thermal stability of PTFE is particularly important, especially in high-temperature chemical industry applications. The multidirectional structure gives the material excellent mechanical performance, superior resistance to hot creep, and optimal dimensional stability, even under prolonged loads.
High chemical resistance: compatible with a wide range of chemicals and acids, and suitable for food and pharmaceutical applications. PTFE is not compatible with: bromine trifluoride, chlorine trifluoride, fluorine dioxide, hydrogen fluoride, molten alkali metals, elemental lithium, elemental potassium, and elemental sodium. For compatibility with the filler materials used in the Sichem range, please refer to the Chemical Compatibility List.
Superior mechanical stability: the biaxial orientation improves resistance to creep and permanent deformation.
Excellent machinability: easy to punch and CNC cut, ensuring precision even for complex geometries.
Low permeability coefficient: ideal for applications requiring long-term tight sealing.
Operating temperature: from –200°C to +260°C, depending on the type of fluid and the applied load.
| Bidirectional PTFE | Sichem Diaphragm |
|---|---|
| Composition |
Pure modified PTFE
|
| Density ASTMF 1315 |
2.18 g/cm³
|
| Minimum operating temperature |
-260 °C
|
| Maximum operating temperature |
+260 °C
|
| Max operating pressure |
Please contact PLANICHEM technical service bar
|
| Leakage DIN 3535-6 |
<0.005 mg*s-1*m-1
|
| Creep relaxation DIN 3535-6 |
<55 %
|
| Compressibility DIN 3535-6 |
>11 %
|
| Recovery DIN 3535-6 |
>5 %
|
| Minimum PH |
0
|
| Maximum PH |
14
|
| Available sheets size |
1.000x1.000 mm
1.500x1.500 mm
|
| Available thickness |
0.75 ÷ 6.00 mm
|
| Sheet size tolerance |
50 mm
|
| Thickness tolerance |
10 %
|
