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Contact     Jennifer C. Haupt

                      IN CLEANROOM ENVIRONMENTS

LANDENBERG, PA, JULY 2009 - - W. L. Gore & Associates, Inc. (Gore) announces
the results of a cable particulation study it contracted with the Fraunhofer Institute for
Manufacturing Engineering and Automation IPA in Stuttgart, Germany. This study
measured the particulation of four different cable systems for ISO cleanroom
certification — two cable chains with GORE™ High Flex Flat Cables, one cable chain
with round cables, and one GORE™ Trackless Cable. To identify the source of potential
particulation for the two chains with GORE™ Flat Cables, Gore selected two non-metal
cable chains to use in the test — a low-vibration cable chain and a conventional chain
design with links and pins.

According to Paul Warren, Gore’s Lead Design Engineer, designing cable systems that
reduce friction is the key to achieving low particulation from these components. Warren
states, “Because of the significance of particulation in cleanroom environments, we
wanted to verify the relationship between friction and particulation in various types of
cable systems.”

Using criteria set forth in Guideline VDI 2083 and ISO 14644-1, Fraunhofer calculated
the amount of particles at three separate measuring points for each cable. The test
registered zero particulates for both the GORE™ Trackless Cable and the GORE™
High Flex Flat Cable in the low-vibration chain. The conventional chain with GORE™
High Flex Flat Cables emitted particles at rates of 0.1 to 1.7 particles per cubic foot,
depending on the velocity, and the conventional chain with round cables was also
affected by velocity, emitting 0.0 to 2.5 particles per cubic foot. Testing identical flat
cables in two different cable chains indicated that the particulation was caused by the
cable chain and not the cable.

Based on ISO guidelines, Fraunhofer determined the following ISO 14644-1 cleanroom
certifications based on the velocity that generated the most particulation:

GORE™ Trackless Cable: Class 1
Low-Vibration Chain with GORE™ High Flex Flat Cables: Class 1
Conventional Chain with GORE™ High Flex Flat Cables: Class 5
Conventional Chain with Round Cables: Class 4

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                                            GORE PARTICULATION STUDY (PAGE 2)

The Fraunhofer study concluded that the GORE™ Flat Cables and GORE™ Trackless
Cable produced substantially less particulation. Warren concludes, “The unique
construction of GORE™ High Flex Flat Cables and GORE™ Trackless Cables
distributes the force placed on the cable jacketing, which means less friction caused by
movement. An added advantage of these cables is that they reduce the weight and
stress of cable systems by eliminating the need for cable chains, dividers, and shelves,
which ultimately improves cable performance and life.”

For more details on this study, visit to review Gore’s white paper
“Cable Particulation Study for Cleanroom Environments”.

For additional information, contact Gore at 800.445.4673 (USA) or 302.292.5100
(International); or visit our web site at

About W. L. Gore & Associates, Inc.
With more than $2.5 billion in annual sales and 8,000 employees in over 45 facilities
worldwide, W. L. Gore & Associates, Inc., provides diverse, high-performance solutions
in consumer, industrial, electronic, medical, and surgical markets. As well-known for its
unique corporate culture as for its products, Gore's 50-year success story rests equally
on product and organizational innovation. Gore is one of only four companies included
in every selection of Fortune Magazine's "100 Best Companies to Work For" since the
list began in 1984. Perhaps best known as the inventors of expanded PTFE (ePTFE)
and the makers of GORE-TEX® fabric, Gore is a leading manufacturer of thousands of
advanced technology products that comprise a breadth of capabilities.

GORE is a trademark of W. L. Gore & Associates, Inc.


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