DONALDSON MEMBRANES BAGS THE PORTUGUESE CEMENT MARKET WITH TETRATEX #6255 FILTRATION MEDIA 1

Donaldson Membranes, worldwide manufacturers and suppliers of expanded PTFE membranes, films and laminates, recommended Tetratex #6255, an ideal media for fabric filters employed on kiln dedusting applications.

The Cimpor-Portugal application involved installations equipped with AAF XLC Fabri-Pulse bag filters. The filter bags were manufactured in Tetratex #6255 Woven Glass fabric with Tetratex Ultra High Efficiency ePTFE membrane, suitable for continuous service at temperatures of up to 260oC.

The contract to supply Tetratex #6255 to AAF/Cimpor represents yet another coup for Donaldson Membranes.

AAF International is one of the world’s largest manufacturers of air filtration products and services including dust collection, offering efficient and cost-effective environmental solutions produced to rigid quality standards.

Cimpor-Portugal manufactures and markets: cement; lime; concrete aggregates; precast concrete and dry mortars with operations in Portugal; Spain; Morocco; Tunisia; Brazil; Mozambique; Egypt and South Africa.

The AAF bag filters at Cimpor-Portugal are employed to filter dust laden gases from the kilns and raw mills using an Off-line cleaning system. This highly effective bag cleaning system is designed to reduce pressure drop and compressed air consumption whilst extending bag life and decreasing maintenance needs.

Donaldson Membranes Tetratex #6255 is an essential part of this process, requiring lower pressure compressed air and less frequent cleaning due to its exceptional dust cake release properties, whilst giving near zero particle emissions.

Tetratex #6255 is just one of the many high performance products amongst the Donaldson Membranes range of Tetratex filtration medias, which are employed in a wide range of industrial applications including: cement; incineration; metallurgical; chemical; pharmaceutical; food; paint; and waste to energy plants.

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About Donaldson Company, Inc.

Donaldson Company, Inc., headquartered in Minneapolis, is a leading worldwide provider of filtration systems and replacement parts. Founded in 1915, Donaldson is a technology-driven company committed to satisfying customer needs for filtration solutions through innovative research and development. Donaldson serves customers in the industrial and engine markets including dust collection, power generation, specialty filtration, compressed air purification, off-road equipment, industrial compressors, and trucks. Our 9,000 employees contribute to the company's success at over 30 manufacturing locations around the world. In fiscal year 2003, Donaldson reported sales of more than $1.2 billion and achieved its 14th consecutive year of double-digit earnings growth. Donaldson is a member of the S&P MidCap 400 Index and Donaldson shares are traded on the New York Stock Exchange under the symbol DCI. Additional company information is available at www.donaldson.com.

About Donaldson Membranes

Donaldson Membranes is a leading worldwide brand name and are the manufacturer of Tetratex® expanded polytetrafluoroethylene (PTFE) membrane. High performance laminates offer superior dust cake release, low pressure drop, higher air flow, and high efficiency, making Tetratex® an excellent choice for filtration and other applications.

For over 20 years Donaldson Membranes has been solving challenging problems in a variety of markets including: industrial filtration; pharmaceutical; microfiltration; fuel cell, medical and more. For customers requiring a high performance membrane to solve a problem, Donaldson Membranes has the answer: Tetratex®.