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On April 21, 2023, the Postal Service issued its final rule requiring Electronic Indicators when shipping Hazardous Materials (HAZMAT) and Dangerous Goods (DG).
The final rule will require use of Service Type Codes (STCs) specific to HAZMAT/DG shipments effective July 9, 2023. The final rule also states that effective January 21, 2024, mailers of HAZMAT/DG must implement the new two-dimensional barcode or Intelligent Mail Matrix Barcode (IMmb) when shipping,in addition to the existingIntelligent Mail Package barcode (IMpb).
On November 30, 2022, the Postal Service issued a proposed rule outlining several proposals to improve identification and processing of HAZMAT/DG goods