What materials can be ultrasonically welded?

A wide array of plastic and metal materials can be ultrasonically welded. Thermoplastics with a crystalline molecular structure are the most common choices, including acrylonitrile butadiene styrene (ABS), polyphenylene oxide (PPO), polystyrene (GPPS) and polyethylene (PE). Metallic choices include soft metals such as aluminum, copper and brass.