Are Tetra Paks Non-Toxic?
Tetra Paks are made with 75% paperboard, 20% polyethylene, and 5% aluminum and the layers are adhered using heat and pressure. Polyethylene is the only material that comes in contact with food. Food-grade polyethylene is considered one of the safest plastics but, as I wrote about in this post, even plastics thought to be safe can leach chemicals with estrogenic activity.
Toxins in Tea
There have been many references in the news in the last few days about a new study that confirms that plastic tea bags release plastic particles into brewed tea. (source) One tea bag can release billions of microplastic and nanoplastic particles into the brew. This is thousands of times higher than previously found in other food and drink. There is not sufficient research to determine the health impact of ingesting this amount of plastic on a regular basis.