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Design characteristics

Steady materials.
Stem tightening by PTFE-bellow.

 
 

Due to its excellent mechanical properties and chemical stability FRANK uses a specially modified PTFE. The type DyneonTM TFMTM 1600 PTFE is especially characterized by a lower cold flow and higher resistance to permeation.
Other special materials, such as conductive plastics,

complete the range of materials used.
Each valve is checked for proper working order and to rule out leakage.
Material and inspection certificates are supplied according to DIN EN 10204-2.1 respectively DIN 55350 Teil 18

 
Table Exner design characteristicszoom
EXNER design characteristics

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Since 1965