During this time, a young man named Charles Gill had been studying this problem closely and had even made it the focus of his graduate studies. That same year, NGO introduced the first Captan odorant. It quickly became the best-selling odorant in North America, and served as the model for many of the odorants in use today. Other manufacturers soon moved to produce concentrated odorants like Captan or exited the business. This new product was based on tert-butyl mercaptan and the new odorant blend was called BP Captan .
Odorant blends based on tert-butyl mercaptan are the most popular odorant blends used today.
In the 1960s, NGO developed and patented a closed-loop bulk delivery system for odorants. This process eliminates the need to purge storage tanks prior to filling them with new supplies of odorant, thereby minimizing the amount of odorant emitted to the atmosphere during the transfer process. By minimizing the release of these nuisance odors, the NGO process also reduces the number of false leak calls that customers can experience during the transfer process. NGO also was the first supplier to offer returnable cylinders for odorants, thus reducing the environmental impact of using shipping drums. There is no substitute for value.