Asphalt and especially asphalt with VIATOP can be considered to be his world. Horst Erdlen, global head of business unit “Functional additives for a modern infrastructure” (abbr. FAV) at J. RETTENMAIER & SÖHNE / Germany, was very proud to celebrate his 25 years of activities of marketing high quality asphalt and VIATOP on April 1st, 2020.