| Ten years later, Charles Goodyear developed the process of vulcanization, which made rubber more stable in a variety of temperatures. |
| Such a material, called an accelerator, causes vulcanization to proceed more rapidly or at lower temperatures. |
| Natural rubbers, before vulcanization, tend to be sticky and soft at high temperatures, while at low temperatures they are brittle and stiff, making them difficult to process. |
| Mr. Goodyear had not yet discovered, however, the process of vulcanization, upon which the rubber industry is founded. |
| Aniline is used in the manufacture of a number of products including dyes, pharmaceuticals, antioxidants, and vulcanization accelerators in rubber compounds. |
| The heat used in vulcanization reaches as much as three hundred degrees Fahrenheit. |
