As a product specialist, Constantin Gehriger is used to give talks at symposia with academic institutions, trade associations, shows and corporations headquarters. Seminars on materials choice for corrosion and environmental control at major clients included: Hoechst, Bayer, Sandoz, Ciba-Geigy, Roche and Imperial Chemical Industries. Seminars on analysis and contamination control of DI-water, process chemicals and gases were given to; IBM, Motorola, National Semiconductor, Texas Instruments, Digital Equipment, Siemens, Philips, Intel, NEC, Lucky Goldstar and Hyunday.