Article by Author Robert Cox, MD, PhD - see http://www.emedicine.com/emerg/topic228.htm --- Nitrile is a material that has much better chemical resistance than latex and is now available in a thin, flexible, disposable glove that permits good manual dexterity.  Also, one common misconception is that Tyvek suits are suitable for decontamination work.  This material provides no chemical protection and most chemicals can penetrate this material immediately; although it suffices for work with dusts, including radioactive dusts and biological agents.  These suits are recommended for training exercises but should not be relied upon for chemical protection.

Notes:  

• Immediately Dangerous to Life or Health Concentrations (IDLHs) - http://www.cdc.gov/niosh/idlh/idlh-1.html (references OSHA definition).      
• Training requirements under OSHA's Hazardous Waste Operations and Emergency Response Standard standard should be reviewed for employees entering a decontamination area.  --  http://tis.eh.doe.gov/docs/osh_hotline/s4a15.html     
• Use of Supply Air Respirator’s and Med Air systems.  The  National Fire Prevention Association (NFPA) does not recommend using the “piped in or wall” Med Air for Personal Protective Equipment (PPE) respirator use due to the potential of interruption of patient use of Med Air. 

Other OSHA documents on PPE - http://www.osha-slc.gov/OshDoc/Interp_data/I19920917B.html