Dive summary: 

• The PET Resin Association has developed a new recyclability assessment model they say is a more "realistic and effective method for assessing recyclability" of PET resin in plastics.
• The PETRA model allows for testing variations at levels of 2%-10%, which encompasses the majority plastics used today, compared to the model from the Association of Postconsumer Plastic Recyclers which test at concentrations of either 25% or 50%.
• PETRA said they designed the model around existing elements in the European PET Bottle Platform recycability guidelines and the APR recycling guidelines for North America, focusing in maintaining rigorous testing benchmarks. 

From the article: 

To overcome recycling test barriers that discourage improvements in PET resin, the PET Resin Association has developed a recyclability assessment model that it said is a more "realistic and effective method for assessing recyclability" of various types of PET resin than the guidelines from the Association of Postconsumer Plastic Recyclers.

The PETRA model integrates the need for continued innovation with stringent resin testing and monitoring, said Ralph Vasami, executive director of PETRA, which represents North American producers of PET resin.

The group announced its Recyclability and Innovation Model and posted it online Oct. 16. The document provides voluntary criteria for testing, evaluating and ensuring the recyclability of newly developed PET resins that are used in manufacturing PET bottles and containers. ...