The Postal Service has announced it will be making revisions to Publication 52 – Hazardous, Restricted, and Perishable Mail, in an effort to more closely align with DOTs regulations on the transportation of hazardous materials. The revisions will include the standards for small quantity provisions of hazardous materials, prohibited shipment for hazard classes 1, 2, 4, and 7, and the expanded requirements for mailing hazardous, restricted, or perishable materials. These revisions will be effective as of August 4, 2016.