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10/31/07
Donaldson Company, Inc.
85 Railroad Drive
Ivyland, PA 18974
(NYSE: DCI)
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For Further Information:
Lisa Wagner 215-396-8349
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FOR IMMEDIATE RELEASE
DONALDSON EPTFE MEMBRANE FILTER MEDIA IS A SUPERIOR
APPLICATION FOR BAG HOUSE FILTRATION
BETTER PERFORMANCE, LOWER OPERATING COSTS
AND INCREASED PROFITABILITY
IVYLAND, PA – DATE – Industrial manufacturers can look to Donaldson Membranes, a division of Donaldson Company (NYSE:DCI), a leading, worldwide manufacturer of filtration systems and parts, for superior baghouse filtration technology using ePTFE membrane filter media.
Choosing the right filtration technology for baghouse applications is dependent on a variety of environmental elements:
Temperature: Low temperature filtration (milling, grinding, mixing and bagging operations) or high temperature filtration (utility boilers, incinerators, dryers or kilns)
Adverse gas and chemical conditions: Ability of the membrane to resist degradation from expected levels of acids, alkalis, solvents and oxidizing agents

Humidity: Resistance to hydrolysis at expected temperature and humidity levels
Dimensional stability: Resistance to shrinkage and stretching at the expected temperatures and gas conditions
History of existing application
Manufactured from ePTFE fluropolymer resin, Donaldson’s Tetratex® membrane filter media is laminated on a variety of substrates and provides higher efficiency than conventional bags.Its ‘non-stick’ nature delivers exceptional dust cake release, creates increased air flow and a decrease in pressure drop translating into considerable energy savings and extended bag life. Other features include:
Near zero emissions meet or exceed the strictest regulatory standards
Increase in the air-to-cloth ratio permits reduced baghouse sizing
Maintains efficiency by surface filtration i.e. limiting fine particle penetration — even particles as small as .05 microns
Donaldson’s Tetratex microporous ePTFE filter media is sold in roll good form to qualified filter bag manufacturers. It is used in a variety of applications that require higher air flow than conventional products, for air pollution control and product recovery. By combining Tetratex with the appropriate substrate, a filtration solution can be created that meets the precise performance parameters required for virtually any high flow filtration challenge.
Donaldson Membranes manufactures technically superior, high quality ePTFE membrane based products for industrial filtration applications, such as environmental and pollution control and fluid separation.
For more information on Donaldson Tetratex ePTFE media for industrial filtration applications, visit the company’s website at www.tetratex.com or contact Donaldson Membranes at (215) 396-8349 or membranes@donaldson.com.
About Donaldson Company, Inc.
Donaldson is a leading worldwide provider of air and liquid filtration systems and replacement parts that improve people’s lives, enhance our Customers’ equipment performance and protect our environment. We are a technology-driven company committed to satisfying our Customers’ needs for industrial filtration solutions through innovative research and development, superior technology and global presence. Our 12,000 employees contribute to the company’s success by supporting our Customers at more than 100 sales, manufacturing, and distribution locations around the world.
Donaldson is a member of the S&P MidCap 400 Index, and Donaldson shares are traded on the NYSE under the symbol DCI. Additional company information is available at www.donaldson.com.
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