Hazard Communication Standard (HCS) changed in 2012 to be more consistent international standards. The first phase in requirement is training for employees about changes by Dec 1, 2013. The new standard is phased in until June 1, 2016, The most notable change is going from MSDS to SDS in a new format.

Here is a link to FAQ related to the change and the OSHA website.

http://www.jjkeller.com/shop/content____bi-hazcom-faqs___

https://www.osha.gov/dsg/hazcom/HCSFactsheet.html