Realizing that plastic, like
asphalt, is a
petroleum product, Bergman theorized that plastic could be
recycled and used to build highways. She brought the idea to her former partner Gary Fishback, who patented it under the Plasphalt™. Plasphalt consists of recycled plastic that is made into a heat absorbing material and is added to asphalt to displace petroleum and hydrocarbon pollutants. While at the time 10% more expensive to use than traditional asphalt, Plasphalt lasts 25% longer. In 2002, Plasphalt was used to reinforce a 2-mile stretch of
New Mexico's
I-25. Fishback and Erik Bowers (Bergman's son) of TEWA Technology developed the project and materials, diverting 27% of all waste from
landfill to the highway. At the time TEWA's best local suppliers were
Philips Semiconductors,
Intel,
Coca-Cola, and
Sandia National Laboratories. Unfortunately, because of lack of support from local government, the company went bankrupt. However, Plasphalt is now used to build roads in China and India. The benefits of using plastic in asphalt according to Michael Valenti, author of
Plastic Plus Asphalt equals "Plasphalt", is that the impermeability of the plastic improved the water proofing of the Plasphalt, making it more resistant to rain, snow, or ice. A benefit of the Plasphalt process is that it works well with mixed plastics, such as
high density polyethylene and
polytetrafluorethylene. It also does not require the laborious sorting of different types of plastics, as do other recycling techniques. Laying a single mile of road would require 100 to 200 tons of Plasphalt according to Dennis Egan, a mechanical engineer with Plasphalt Project Ltd. ==Academic appointments==