Hazard Communication - 2012 Standard | Occupational Safety and Health ... HCS/HazCom 2012 Final Rule Appendices, and Comparison Documents. HCS/HazCom Final Rule Regulatory Text. Preamble for HCS 2012. Preamble for 1994 HCS. Hazard Communication - OSHA Standards. Federal Register: The Final Rule was published on March 26, 2012 and became effective May 25, 2012. Federal Register [ PDF] 2013 Corrections Notice.