Asbestos can be found in all of the following materials EXCEPT:

Asbestos is a naturally occurring mineral that was commonly used in various building materials due to its heat-resistant properties and strength. It can indeed be found in gaskets, fireproofing materials, and insulation, as these components often require resistance to high temperatures and fire.

Gaskets, especially those used in industrial applications, may contain asbestos to maintain their integrity under stress and heat. Similarly, fireproofing materials can include asbestos fibers to enhance their ability to withstand flames and high temperatures, which is essential for safety in construction and industrial settings. Insulation, particularly in older buildings or equipment, often incorporated asbestos to provide thermal resistance, further highlighting its prevalent use.

Rubber, on the other hand, is not a natural position for asbestos. While rubber can be mixed with various additives and reinforcements, it does not typically have asbestos as part of its composition. This makes rubber the correct answer, as it is one of the few materials listed that is not associated with asbestos usage historically.