Mohammad Razavi Nouri has written:

'The Thermal and mechanical properties of polypropylene, metallocene polyethylenes and their blends'

Leslie Anne Bishop has written:

'The synthesis, reactivity and characterization of group IV transition metallocene derivatives and the study of molecular snaps' -- subject(s): Metallocenes

I just had an MRI and they told me that if you "recently" had a tattoo, it can pull some of the ink out. Unlikely at best. Most pigments are carbon based and therefore non-metallic / non-magnetic. It's totally possible if you got your tattoo in JAIL, but otherwise, not if you got it in the last 20 years. no one uses lead based or metallic ink anymore

While it is highly unlikely that an MRI would cause any problems the above answer is incorrect. No agency regulates tattoo inks, and metallic inks are still being manufactured. With the recent scares regarding lead and other toxins in products imported from China there may be reason for concern...Many tattoo inks are made in China. A LOT of black tattoo ink is made from iron oxide. No one uses lead-based or mercury-based ink anymore, but almost all tattoo ink is made from metallocene pigments--they are more durable than dyes or plastics. My bet: if you got the work done recently an MRI machine can pull the ink out.

Most LDPE, MDPE and HDPE grades have excellent chemical resistance, meaning that it is not attacked by strong acids or strong bases. It is also resistant to gentle oxidants and reducing agents. Polyethylene burns slowly with a blue flame having a yellow tip and gives off an odour of paraffin. The material continues burning on removal of the flame source and produces a drip. Crystalline samples do not dissolve at room temperature. Polyethylene (other than cross-linked polyethylene) usually can be dissolved at elevated temperatures in aromatic hydrocarbons such as toluene or xylene, or in chlorinated solvents such as trichloroethane or trichlorobenzene