A Closer Look at Clamshells
In recent months, Orange County Solid Waste informed residents and establishments that #1 PET plastic clamshells are no longer recyclable in Orange County. Many are confused by this change, especially because for a very short time this material was accepted.
Previously, Orange County sent it’s recycling to a material processing facility (MRF) that started accepting clamshells around 2019. In 2021, following a competitive bidding process, a contract with a different recycling processor was implemented. The County’s current processor does not accept plastic clamshells. The reason the current processor does not accept clamshells is because they are more difficult to recycle into new materials, and there is no market for the material.
When #1 PET clamshells, lids, trays, and tubs (e.g. fruit containers, lettuce tubs) are manufactured, the plastic is molded using a process called thermoforming. Contrarily, bottles, jars, and jugs are made through blow molding. Thermoforming uses heat and pressure or vacuum forming to mold thin sheets of plastic into the desired shape. Blow molding heats the plastic and pumps air to conform the plastic into the shape of the mold.
Just as these materials are manufactured differently, they are recycled differently, too. Thermoform plastics often have strong adhesive labels that are difficult to separate from the plastic itself, unlike water bottles that have a plastic sleeve. When thermoform plastics are broken down, the pellets have a different bulk density and are much smaller than PET bottle pellets. Therefore, thermoform pellets cannot be mixed with other PET materials because they melt at a different temperature and move through material handling systems at a different rate. Sorting machinery at MRFs is not equipped to sort bottles from clamshells, so, when included, they are unintentionally baled together. Plastic bottle bales with clamshells are seen as contaminated, decreasing their resale value, and decreasing the value of recycling material.
Due to the obstacles of recycling thermoform plastics, aka clamshells, the best disposal method is to throw them away, or reuse them as storage containers.
Please note, it is not advisable to rely on information about what other communities say can be recycled. Some surrounding counties, including Durham, send their materials to a different recycling processor, resulting in their communities having different acceptable materials; this is why recycling guidelines can vary from one town to the next.