Environment

Tomato and egg waste may end up in your tires

A sample of the not-so-black rubber
A sample of the not-so-black rubber
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Katrina Cornish (left) and Cindy Barrera (right) examine ground tomato skins and eggshells, as well as samples of rubber
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Katrina Cornish (left) and Cindy Barrera (right) examine ground tomato skins and eggshells, as well as samples of rubber
Dried and ground tomato skins (top) and eggshells (bottom) are shown after coarse, medium, and fine processing 
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Dried and ground tomato skins (top) and eggshells (bottom) are shown after coarse, medium, and fine processing 
A sample of the not-so-black rubber
3/3
A sample of the not-so-black rubber

A typical automobile tire is composed of about 30 percent carbon black, which is a filler that adds durability to the rubber. Carbon black is petroleum-based, however, meaning that it isn't entirely eco-friendly to manufacture. That's why Ohio State University scientists led by Katrina Cornish have been experimenting with a "greener" and more readily-available alternative – namely egg shells and tomato skins.

Obtained in the form of food industry waste, the shells and skins are dried and ground into a powder. When that powder is added to rubber, it reportedly makes the rubber stronger while allowing it to remain flexible (by contrast, most other strength-enhancing additives decrease the rubber's flexibility).

This attribute is partially due to the fact that the porous egg shell particles have a large surface area, allowing for greater contact with the rubber, while the tomato skin particles remain highly stable at high temperatures, plus they contain tough fibers.

Katrina Cornish (left) and Cindy Barrera (right) examine ground tomato skins and eggshells, as well as samples of rubber
Katrina Cornish (left) and Cindy Barrera (right) examine ground tomato skins and eggshells, as well as samples of rubber

In fact, researchers from Ford and Heinz have been using the skins to manufacture interior car parts, while scientists at Tuskegee University have been using shells to make flexible bioplastics.

According to Cornish, the Ohio State technology should serve to make tire production more sustainable, it should reduce American dependence on foreign oil, and it will keep waste from the food industry from ending up in the landfill. The tire rubber created thus far is a sort of reddish-brown, however, so the team is looking into adding black coloring agents.

Source: The Ohio State University

1 comment
apprenticeearthwiz
Reddish brown could be a desirable point of distinction. More and more people care what their stuff is made of.
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