Interpretation of the IMDG Code – Deep Analysis of Packaging Construction and Coding System

I. Core Structure of Packaging Codes

According to IMDG Code Chapter 6.1, UN packaging codes consist of 6 key segments, each representing specific regulatory information:

Example Code: 1A1/Y1.8/150/23/USA/SL123

  1. Packaging Type Identifier (first 2-3 characters)

    • Number: Packaging form (e.g., 1=drum, 4=box)

    • Letter: Material type (e.g., A=steel, H=plastic)

    • Common combinations:

      • 1A1: Closed-head steel drum

      • 4G: Fiberboard box

      • 6HA1: Composite plastic container

  2. Performance Level (Y/Z designation)

    • Y: Suitable for PG II and III dangerous goods

    • Z: Only for PG III dangerous goods

    • *Number**: Relative density requirement (e.g., Y1.8=must withstand liquids with density ≤1.8)

  3. Hydraulic Test Pressure (kPa)

    • Standard values: 100/150/200 kPa

    • Corresponding packaging groups:

      • PG I: ≥250 kPa

      • PG II: ≥100 kPa

      • PG III: ≥100 kPa

  4. Year of Manufacture

    • Last two digits (e.g., 23=manufactured in 2023)

    • *Rule requirement**: Must be retested if over 5 years old

  5. Approving Country Code (ISO two-letter)

    • USA (United States), CN (China), DE (Germany)

    • *Special case**: “VL” indicates virtual testing laboratory

  6. Manufacturer Number

    • Unique identifier issued by national authority

    • Chinese format: Province code + serial number (e.g., BJ001)

II. Special Packaging Construction Requirements

1. Composite Packaging (6HA1 Series)

  • Structure: Plastic inner vessel + steel outer frame

  • Testing requirements:

    • Inner vessel must pass leakproofness test

    • Outer frame must pass stacking test (≥3-meter stacking pressure)

2. Salvage Packaging (“S” Designation)

  • Code example: 1A1/S

  • Usage restrictions:

    • For use as secondary packaging only

    • Capacity must not exceed 50% of original packaging

3. Equivalent Packaging (“E” Designation)

  • Code example: 1A1/E

  • Approval process:

    • Must submit equivalence proof to IMO

    • Annual certification list updates required

III. Key 2024 Regulation Changes

  1. Mandatory Digital Labeling

    • All packaging must have QR codes (linking to full test reports)

    • QR code content must include:

      • Testing agency certification number

      • Latest inspection date

  2. Enhanced Requirements for Recycled Plastic Packaging

    • If recycled plastic content >30%, additional tests required:

      • UV aging test (500 hours)

      • Stress cracking test (per ASTM D543)

  3. Lithium Battery Special Packaging (New Class 9)

    • Code designation: 9A/9B/9C

    • Special construction:

      • Short-circuit insulation layer (≥0.1mm)

      • Pressure relief device (activation pressure ≤50kPa)

IV. Compliance Practice Guide

Packaging Selection Decision Tree

  1. Confirm dangerous goods class → Determine packaging group (PG I/II/III)

  2. Check liquid density → Match Y-value (e.g., density 1.5 requires Y1.8 or higher)

  3. Evaluate transport environment → Select protection type (rust-proof/anti-static/light-proof)

Common Compliance Violations

  • Error 1: Using PG III packaging for PG II goods (missing Y/Z designation check)

  • Error 2: Cross-border transport without verifying country approval reciprocity (e.g., CN mark requires re-certification in EU)

  • Error 3: Using expired packaging without retesting (≥5 years requires retest)

V. Additional Resources

  1. UN Packaging Database: www.unece.org/trans/danger/danger.html

  2. China Certification & Inspection Group: www.ccic.com/packaging-cert

  3. Expert Consultation: Contact Dangerous Goods Packaging Experts

📌 Operation Tip: Always verify packaging code compatibility with dangerous goods list (refer to IMDG Code 4.1.4) before shipment

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