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.