New Johns Manville Development: Dynaweb® PBT:

Bad Homburg (April 17, 2002) --- As a result of recent breakthroughs in melt blown technology, Johns Manville is pleased to announce at the INDEX fair in Geneva the development of the new Dynaweb® PBT This new PBT polyester-based product is used in filtration media.

Johns Manville is commercializing the recently developed Dynaweb® PBT for liquid filtration in the medical area and industrial hydraulics. This product will provide a different set of chemicals and thermal resistance for specific applications especially in industrial areas. Dynaweb® PBT can be sterilized by gamma irradiation, which is very important for medical applications and does not exhibit antimony contamination, providing unique product performance. Excellent uniform properties characterize this new product. Currently, Dynaweb® PBT is supplied in weights from 10 to 200 g/sqm and mean flow pore sizes from 1 to 14 microns, as single layer or multi-layer calandered roll goods.

Johns Manville, a Berkshire Hathaway company, is a leading manufacturer and marketer of premium-quality building and specialty products. In business since 1858, the Denver-based company has sales in excess of $2 billion and holds leadership positions in all of the key markets that it serves. Johns Manville employs approximately 9,500 people and operates 52 manufacturing facilities in North America, Europe and Asia. Johns Manville Europe is the European operations for one of Johns Manville's three strategic business units, and has 11 manufacturing locations in Germany, Sweden, the U.K., Poland, Slovakia and China. Additional information can be found at www.jm.com.