e53 Bumpers-what plastic are they made of?

[omodos]

Sorry for stupid sounding question,but can someone shed some light on what exact type of plastic is used in the back part of the x5 bumpers? (please see pic) Guy at a hardware store was convinced that it would stick my pdc sensor&housing back to where it had become detached from the bumper.....checked out glues properties I used and says Bonds: Hard Plastics, Metal, Concrete, Glass, Ceramic, China, Acrylic, ABS, Vinyl, OVD Fiberglass, Wood, Styrene, Corian. Does not bond to Polyethylene or Polypropylene Plastics. Checked out what bumpers are made of in general online and there is good chance they maybe made of this type of plastic.....be a MASSIVE help if anyone has a bumper lying around and can tell me if it has any markings on the back of it like ABS or PPor PE?