Bearing in mind it is a Plastic the type of plastic and its properties would need to be known.
An example, the erasers used by draughtsmen have a paper wrapping around the centre.
If you completely removed the wrapping and placed the eraser on a Perspex set square or the like, for a period of time, it would start to fuse, melt, to the Perspex. Also happens when different plastics come into contact with each other.
The metal working people have similar problems, called juxtaposition of metals, one eats/effects the other.
As stated ask Shapeways.
