cpp – Process technology for the chemical industry 01.2019

clude resistance to temperatures between
–20 and +200 °C as well as better chemical
stability than FKM in contact with many
acids and organic solvents. Chem XP is also
highly resistant to ultraviolet light and
ozone and has very good aging behaviour.
In June 2018, this innovation was presented
to industry professionals for the first time at
Achema. Figure 2 shows a schematic comparison
of the price levels and resistances
for standard FKM, the premium material
FFKM and the newly developed Chem XP
material family.
When Chem XP replaces FKM in an application,
the operating life increases, enabling
maintenance intervals to be extended and
production costs reduced. The risks of unplanned
equipment downtime are simultaneously
minimised, avoiding the high follow-up
costs to operators that are associated
with stoppages. Choosing Chem XP materials
also helps cut the costs for materials.
Since Chem XP’s media resistance to selected
acids and organic solvents is comparable
to that of FFKM, substitution is
possible in these cases and the very high
price of FFKM seals averted.
Formulation for the elastomer mixture
When they developed Chem XP, Freudenberg
Sealing Technologies’ material experts
devoted particular attention to the broadest
possible resistance to aggressive media.
Amongst other things, the Chem XP material
family has a high fluorine content similar
to that of FFKM materials. In combination
with a new formulation for the individual
components, Chem XP achieves a high degree
of media resistance, which has been
successfully demonstrated in comparative
analyses and lab tests.
Picture: Freudenberg Sealing Technologies
Fig. 2: Comparison of resistance and pricing
for three material families: FKM, Chem XP
and FFKM
Lab tests with acids and solvents
The Chem XP material family was investigated
in lab tests, in order to identify
changes in swelling and strength and compare
it with other materials available in the
market. As the benchmark for these comparative
analyses, the material developers at
Freudenberg Sealing Technologies selected
three of the most critical representatives of
each chemical class which is relevant for the
chemical industry. A 20 % concentration of
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cpp 01-2019 57