In June 2011, Mexico released NMX-R-019-SCFI-2011 based on the UN GHS standards. Compliance with NMX-R-019-SCFI-2011 is currently voluntary, but in October 2015, a new Mexican Official Standard was published, NOM-018-STPS-2015. This standard will adopt all of the building blocks for Rev. 5 but will not include the methods for classification like NMX-R-019-SCFI-2011. The NOM-018-STPS-2015 standard will be mandatory in 2018.