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warning or signal capable of initiating corrective action or process shutdown before nanoparticles are exhausted or reenter the work area. If using a Type II biological safety cabinet for work with nanomaterials, consider exhausting directly to the exterior or through a thimble connection over the cabinet’s exhaust. When developing controls for the nanomaterials, consider, but do not unquestioningly rely on, chemical hazard information for bulk or raw materials and any new information specific to the material at the scale being used. When evaluating the hazards and uncertainties for the materials, consider the recognized and foreseeable hazards of the precursor materials and intermediates as well as those of the resulting nanomaterials. Note that the higher reactivity of many nanoscale materials suggests that they should be treated as potential sources of ignition, accelerants, and fuel that could result in fire or explosion. Phosphine is a spontaneously flammable and explosive poisonous colorless gas with the foul odor of decaying fish. The liquid can cause frostbite. Phosphine is a dangerous fire hazard

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