Freudenberg-NOK Sealing Technologies Simrit Adapts to Market Needs in Fluid Handling Applications with FFKM Diaphragm Design

 Freudenberg-NOK Sealing Technologies Simrit Adapts to Market Needs in Fluid
               Handling Applications with FFKM Diaphragm Design

New product successfully in production in customer application

PR Newswire

PLYMOUTH, Mich., July 11, 2013

PLYMOUTH, Mich., July 11, 2013 /PRNewswire/ -- To improve the ability of a
metering pump to resist absorption of media, Freudenberg-NOK Sealing
Technologies Simrit(Freudenberg-NOK) developed a unique diaphragm design for
fluid handling applications, such as inkjet printers used in offices and
homes. Freudenberg-NOK's design replaces the traditional
polytetrafluoroethylene (PTFE) foil with a perfluoroelastomer (FFKM) layer
that is bonded onto fluoroelastomer (FKM) pump diaphragms to improve stroke
length, reliability and durability in select applications.

In the printer application, ink particles were absorbed into the substrate of
the PTFE foil, which then hardened during extended periods of machine shut
down. These hardened particles created stress points in the PTFE, causing it
to eventually break during movement. The elastomeric FFKM layer solved this
problem, since it is not a sintered material, while keeping a high chemical
resistance. Another advantage of the FFKM layer is its high flexibility in
comparison to a PTFE layer, which is an added bonus to the ink contamination
problem. The FFKM cover promotes longer stroke, higher pump frequencies and
life because the diaphragm design is no longer limited by the flexibility and
bending fatigue strength of PTFE.

"Small material improvements have the potential to increase the performance,
reliability and durability of an entire application," said Joel Johnson,
global vice president of technology, Freudenberg-NOK. "Freudenberg-NOK's
materials expertise allowed our engineers to evaluate the PTFE foil used in a
customer's application to determine how a new material may improve the overall
performance of the product. The result was exactly what the customer sought: a
design that improved stroke length, lifetime, flexibility and bending fatigue
strength, while keeping nearly the same chemical resistance benefits of PTFE."

The Simriz® 481 and 491 materials are produced within the Freudenberg and NOK
family of companies, which allows the diaphragm development engineer the
distinct ability to work with the material development group to find a unique
solution that creates a functional part. The Simriz materials are FFKM, which
by definition means that they are chemical resistant, but are also resistant
to bonding and adhesion to other surfaces, which is necessary to make a
functioning diaphragm. For the engineering team, it was clearly recognized
that a diaphragm purely made of FFKM would increase the costs to an
unacceptable level, so a special manufacturing method was developed in
parallel to bind a thin but accurate FFKM layer onto a FKM diaphragm.

About Freudenberg-NOK Sealing Technologies

Freudenberg-NOK Sealing Technologies is the Americas joint venture between
Freudenberg and Co. in Germany and NOK Corp. in Japan. Freudenberg-NOK is a
leading producer – through its Automotive, Merkel, Process Seals and Simrit
sales channels – of advanced sealing technologies for a variety of markets
including: aerospace; agriculture; appliance; automotive; construction;
diesel engine; energy; food and beverage; heavy industry; and pharmaceutical.
Founded in 1989 under the legal name Freudenberg-NOK General Partnership,
Freudenberg-NOK is headquartered in Plymouth, Mich. and operates more than 20
facilities across the Americas. For additional information, please visit

SOURCE Freudenberg-NOK Sealing Technologies Simrit

Contact: Cheryl Eberwein, Director, Media Relations, Office: +1 734 354 7373,
Cell: +1 248 767 1068, E-Mail:, or Lisa Gentile,
Public Relations, Office: +1 734 354 5439, E-Mail:
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