| 1 | By 1964 synthetic rubber made up 75% of the market. | |
| 2 | Isoprene needs to be extremely pure to make synthetic rubber. | |
| 3 | We chose the material [neoprene] before knowing what the design was going to be. | |
| 4 | Synthetic rubber of equal quality still cannot be practicably manufactured. | |
| 5 | In addition to first developing nylon, also helped lay the groundwork for Neoprene. |