Considerations for Modifications to OSHA Method 47 Air Monitoring Method: Diphenylmethane Diisocyanate (MDI) 
The purpose of this document is to provide considerations for modifications to the Occupational Safety and Health Administration (OSHA) air sampling method for MDI: OSHA Method 47. These modifications can help improve the ability of the method to sample and derivatize MDI. The information provided in this document is not a directive or an industry standard. The information is intended as guidance. Users should independently determine what constitutes an appropriate practice relative to their own needs and circumstances.