The U.S. Chemical Safety and Hazard Investigation Board (CSB) has formally notified OSHA that it finds “unacceptable” OSHA’s response to CSB recommendations to broaden the regulation of reactive chemicals in the workplace and to compile data on reactive chemical accidents.

In a letter to OSHA chief John Henshaw, CSB Chair Carolyn Merritt said the board will continue to seek action from OSHA on the requested actions. Merritt said the board was “disappointed” that OSHA had given no indication when it might make a decision on moving forward to extend coverage of reactives.