Oct 28, 2009. /Lesprom Network/. Ahlstrom announced price increases on its filter media products for transportation and specialty filtration, as a consequence of the rise of raw material costs. The price increase will affect filtration grades produced by Ahlstrom globally, sold for transportation and specialty filtration applications, and will be effective as of January 1, 2010. The level of increase will depend on the markets, the constituents of the products, and the structure of the agreements in place. The increase range will vary up to 10 %. Specific details will be discussed with each customer individually by the appropriate business teams in the coming days. Ahlstrom is a global leader in the development, manufacture and marketing of high performance nonwovens and specialty papers.