The present invention provides a slurry composition and method for polishing organic polymer-based ophthalmic substrates. In case of a mismatch between cargo contents shown by manifest data and the X-ray images, the cargo may be withheld for further inspection. The unit is covered by the track vehicle door and separated from the rail track when the track vehicle door is closed and remains uncovered by the same when the track vehicle door is open. The substrate is coupled to the plurality of die via the through-silicon vias. Between the two parts, a metamorphic polyethylene layer exhibiting a good joining property for both the first and second plastic parts is interposed to join the parts.