ISO 20848-3:2018

Overview

ISO 20848-3:2018 specifies the characteristics and dimensions of plug/bung closure systems for internally threaded openings in plastics drums with a nominal capacity of 113,6 L to 220 L. It is part of the ISO 20848 series on plastics drums and focuses on defining dimensional, material and marking requirements that support consistent, safe handling and reuse of drums worldwide.

Key topics and technical requirements

• Scope and purpose: Defines closure system characteristics and dimensions for plug/bung (BCS) types used on plastics drums of 113,6–220 L.
• BCS types and annexes: Detailed dimensions and tolerances are provided in normative annexes A–F for the following BCS types:
  • BCS 70 × 6, BCS 56 × 4, BCS 38 × 6
  • BCS G2 × 5, BCS G2 × 11,5, BCS G3/4 × 14
• Closure dimensions and tolerances: Annexes include diagrams (plug, housing, capseal, gasket) and dimensional data to ensure interchangeability and correct fit.
• Gaskets and sealing faces: Requirements for correct gasket positioning and the design of gasket sealing faces to achieve leakproof performance.
• Closure torque and tooling: A recommended closure torque (with tolerance) and appropriate closing tooling must be specified to ensure repeatable, tested closure performance.
• Materials and marking: Plastics components (excluding gaskets) must carry a permanent material identification symbol (see Annex G). Materials must be suitable for the intended physical and chemical use.
• Thread and plug design: Thread forms are specified in the annex figures; plugs must be removable/insertable with simple tools.
• Vented plug/bung guidance: Vented plugs and their capseals should be coloured yellow for identification; venting design must comply with applicable dangerous-goods regulations.
• Measurement conditions: Dimensional measurements are made at ambient conditions and not within 48 hours of manufacture; plug housing diameters are averaged from at least two readings at 90°.

Note: ISO 20848-3 specifies geometry, marking and design rules but does not include detailed performance test methods - those depend on application and transport regulations.

Practical applications and users

• Drum manufacturers and closure suppliers - design and validate plug/bung systems to ISO dimensions for interchangeability.
• Packaging engineers and product designers - select appropriate closures, gaskets and materials for chemical compatibility and handling.
• Quality assurance and procurement teams - verify dimensional conformity, material marking and closure torque specifications.
• Transport and regulatory compliance specialists - ensure drum/closure combinations meet UN, ICAO and IMO requirements when shipping dangerous goods.
• Recyclers and re-conditioners - reuse drums safely using standardised closure systems.

Related standards and references

• ISO 20848 series (other parts covering different drum sizes)
• Annex references include capseal specifications (e.g., ISO 15750-3 mentioned for metal capseal compatibility)
• Transport regulations: UN Recommendations on the Transport of Dangerous Goods, ICAO Technical Instructions, IMO IMDG Code

Keywords: ISO 20848-3, plastics drums, plug bung closure, BCS types, gaskets, closure torque, capseal, drum packaging, dangerous goods.