Ahlstrom Corporation STOCK EXCHANGE RELEASE 18.7.2011 at 09.45 Ahlstrom, a global high performance materials company, expects its operating profit excluding non-recurring items (NRI) for 2011 to be lower than earlier anticipated due to continuing cost inflation in raw materials prices. As a result, Ahlstrom updates its 2011 outlook for operating profit excluding non- recurring items. Ahlstrom's sales volumes have been developing as expected, but due to the more challenging than expected market conditions the company has not been able to fully pass on the increases in raw material cost to its selling prices. The company will maintain the current outlook for net sales, estimated at EUR 1,920-2,080 million. The revised outlook for operating profit before NRI is estimated to be EUR 75-95 million for the full year 2011 instead of the previous estimate of EUR 90-110 million. Ahlstrom will continue to proactively manage its selling prices in order to compensate for the increases in raw materials prices. The company will also take action to further streamline its cost structure to gain efficiencies in the supply chain, particularly in manufacturing and sourcing. Ahlstrom will publish its interim results for January-June on August 10, 2011. For further information, please contact: Liisa Nyyssönen Vice President, Communications Tel. +358 10 888 4757 Seppo Parvi CFO Tel. +358 10 888 4768 Distribution: NASDAQ OMX Helsinki Main media www.ahlstrom.com Ahlstrom in brief Ahlstrom is a high performance materials company, partnering with leading businesses around the world to help them stay ahead. Our products are used in a large variety of everyday applications, such as filters, wallcovers, wipes, flooring, labels and food packaging. We have a leading market position in the businesses in which we operate. Our 5,700 employees serve customers in 26 countries on six continents. In 2010, Ahlstrom's net sales amounted to EUR 1.9 billion. The company's share is quoted on the NASDAQ OMX Helsinki. More information available atwww.ahlstrom.com. [HUG#1531500]