Datasheet

© Freudenberg Simrit GmbH & Co. KG | Technical Manual 2007 597
Products I ISC O-Rings and Static Seals
Merkel Grafiflex
®
6501
Product description
Merkel Grafiflex is characterised by the highest level of
chemical resistance and temperature resistance as well
as an excellent sealing effect and persistent elasticity.
Regardless of temperature cycle, there is no cold flow,
shrinkage or ageing of the material. Merkel Grafiflex
meets the purity requirements for seals in nuclear power
station valves (content of soluble chlorides <20 ppm).
Merkel Grafiflex rings
Compression moulded Merkel Grafiflex rings are sup-
plied with a density between 1,4 and
1,85 g/cm
3
.
Merkel Grafiflex Strip
Merkel Grafiflex Strip with crosshatch surface pattern is
used to make rings in the event of repairs. The Grafiflex
material is approved for use with gaseous oxygen,
drinking water and for the food processing industry.
Like Grafiflex 6509, it is also available with corrosion
inhibitor.
For reworked valves with large gap dimensions, the
use of Merkel Grafiflex with Merkel Carbosteam 6550
endrings is recommended.
Product advantages
Very high temperature and chemical resistance
Excellent sealing effect and constant elasticity
Fast delivery times without additional tool costs.
Application
Valves.
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Operating conditions
Operating pressure Temperature pH value
1000 bar
–200 … +450 °C
1)
0 … 14–200 … +700 °C
2)
–200 … +2500 °C
3)
1)
the majority of media and air
2)
steam
3)
inert gas
Media
Hot water, feed water, steam, heat transfer oil, hydro-carbons and many other media. Exceptions: strongly oxidising
media