The product family includes, among others, the felt paper grades WFDF and CFDF, as well as the wool felt and rag felt variants HFAF and WFGL. WFDF consists of cellulose and cotton, while CFDF is made from cellulose and recycled fibers. HFAF is based on sheep’s wool and cellulose, whereas WFGL is composed of cotton and cellulose. The suitability of a particular grade depends on whether the material is to be used as a carrier for laminates, for core production, or as a sealing material.