Overview
EN ISO 20848-3:2018 (CEN endorsement of ISO 20848-3:2018) defines the characteristics and dimensional requirements for plug/bung closure systems used on internally threaded plastics drums with a nominal capacity of 113.6 L to 220 L. The document standardizes closure interfaces (threads, gaskets, housings) so drums can be filled, emptied and sealed reliably for transport, storage and reuse. It focuses on geometry, identification and assembly requirements; detailed performance tests are intentionally excluded.
Key topics and technical requirements
- Scope and purpose
- Specifies dimensions, tolerances and important features for plug/bung closure systems (BCS types) for 113.6–220 L drums.
- BCS types and annexes
- Dimensional specifications are given in normative annexes A to G for the following BCS types: BCS 70×6, 56×4, 38×6, G2×5, G2×11.5, G3/4×14.
- Gaskets and sealing
- Gasket positioning and gasket sealing faces are defined; gasket material selection must suit intended chemical/physical conditions.
- Closure torque and tooling
- A recommended closure torque (with tolerance) and the appropriate closing tool(s) must be specified by the supplier to ensure repeatable, leakproof assembly.
- Material identification
- All plastic closure components (excluding gaskets) must carry a permanent material identification symbol per Annex G.
- Thread and finish
- Thread profiles are defined in the annex figures; internal and external finishes must match the drum’s intended use.
- Vented plugs and tamper evidence
- Guidance on vented plug/bung color (recommended yellow) and capseals/overseals for tamper evidence and contamination protection.
- Measurement practice
- Dimensional measurements at ambient conditions; not within 48 hours of manufacture. Plug/bung housing diameters: mean of at least two orthogonal readings.
Applications and users
This standard is essential for:
- Drum and closure manufacturers - to design and produce interchangeable closures that meet dimensional requirements.
- Packaging designers and specifiers - to select compatible closures for chemical, food or industrial drums.
- Fillers, logistics and transport companies - to ensure correct closure, sealing and repeatable assembly for safe handling and transport.
- Regulatory and compliance teams - to align packaging with transport regulations for dangerous goods (see UN, ICAO, IMO/IMDG).
- Testing and inspection labs - for dimensional verification and conformity checks against the specified annexes.
Related standards and notes
- Part of the ISO 20848 series (other parts cover different drum capacities and closure types).
- For transport of dangerous goods, follow relevant regulations: UN Recommendations, ICAO Technical Instructions, IMO IMDG Code.
- EN ISO 20848-3:2018 standardizes dimensions and identification; it does not include detailed performance test methods - those depend on application and regulatory requirements.
Keywords: EN ISO 20848-3:2018, plastics drums, plug bung closure systems, BCS, gaskets, closure torque, material identification, packaging standard, drum closures.
