3D Systems ProJet 7000 Facility Requirements Manual page 20

Contamination - Care should be taken when cleaning windows, panels, and other parts of the ProJet™ 7000. Cleaning products
which contain ammonia, should not be used because they can cause contamination of the material. Instead use a small amount
of isopropyl alcohol on a paper towel to clean up spills. Accidental contamination of resins may change the material's
performance characteristics to such an extent that acceptable parts can no longer be reliably created.
Polymerization - Signs of polymerization of stored resin include container bulging, leaking, and the emission of heat, or an
unusual odor from the container. If you notice this, do not use the material and dispose of it properly.