The purpose of this document is to provide considerations for modifications to the Occupational Safety and Health Administration (OSHA) air sampling method for TDI: OSHA Method 42. These modifications can help improve the ability of the method to sample and derivatize TDI. 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.
Considerations for Modifications to OSHA Method 42 Air Monitoring Method: Toluene Diisocyanate (TDI) 
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