Actually, it seems to be a composite material, not sure if it's plastic. Someone was a bit too heavy for a chair here at work and cracked the seat. It's a $1200.00 chair, so I saved it from the trash.

Lasers have been used to weld together plastic parts for decades, but until recently the technology had one major disadvantage: it could not be used to weld clear polymers. Recently, high-powered ...