Dangerous Goods Pails — UN Certified for Hazmat Transport

If you're preparing a dangerous goods shipment in the United States, your outer packaging has to satisfy 49 CFR Part 173 — the federal regulation covering hazmat packaging. UN-marked pails are how you satisfy it for most solid and many liquid dangerous goods in the 5-gallon size class.

We stock two UN-certified pails that meet this requirement.

For solid dangerous goods

The M2 5-gallon HDPE pail carries the marking 1H2/Y27/S. It's certified for Packing Group II and III solids up to 27 kg gross mass. In-stock in white, standard pricing, ships next-day. This covers the majority of solid hazmat shipments: powders, granules, absorbent-packed materials, waste consolidation. See the M2 solid-rated pail page for engineering detail.

For liquid dangerous goods

The M4 5-gallon HDPE pail carries three markings depending on configuration: 1H2/Y1.5/30, 1H2/X40/S, and 1H2/Y40/S. It's certified for Packing Group I, II, and III liquid hazmats via ground and vessel transport. Custom-order, 6-8 week lead time. See the M4 liquid-rated pail page for full specs and quote workflow.

What the marking looks like on your paperwork

When a shipper's declaration or dangerous goods form asks for outer packaging specification, you write the UN marking exactly as it appears on the pail. For an M2, that's 1H2/Y27/S/[year]/USA/[registration]. The manufacturer code and year of manufacture are embossed on the pail alongside the performance marking. Match what's on the pail to what's on the paperwork.

Where UN pails do NOT satisfy 49 CFR

A pail carrying a valid UN marking is not automatically compliant for every shipment. Common cases where you need something else:

  • Air freight of liquid hazmats. UN pails at this size are ground and vessel only. IATA rules require air-specific packaging combinations.
  • Certain hazard classes. Explosives (Class 1), infectious substances (Category A), radioactive materials, and some Division 5.2 organic peroxides have packaging requirements that go beyond standard UN pail certification.
  • Bulk quantities. UN pails top out at 27 kg (M2) or 40 kg (M4) gross mass. Larger shipments need drums, IBCs, or bulk containers with their own certification.
  • Incompatible chemistry. UN certification tests structural performance, not chemical compatibility with your specific contents. Check the HDPE compatibility guide or your SDS.

When in doubt, your carrier's dangerous goods team is the authoritative check. We can supply the manufacturer certification letter to support their review.

DOT hazmat registration and packaging responsibilities

DOT holds the shipper — not the packaging manufacturer — responsible for correct packaging selection. What we can do is supply pails that carry valid, current UN markings backed by manufacturer test certificates. What you or your compliance team must do is confirm the marking is appropriate for the specific material being shipped, verify the closure is installed correctly, and complete the required shipping papers accurately.

This division of responsibility is standard across the industry. It's the reason UN pails carry markings rather than blanket approvals.

Common shipping scenarios we support

  • Waste consolidation and disposal (solid): M2
  • Sample shipments to labs (solid or liquid): M2 for solid, M4 for liquid
  • Small-batch chemical distribution: M2 in stock, M4 to spec
  • Spill kit contents (absorbent-packed hazmats): M2
  • Industrial chemistry containers ground/marine shipment: M4
  • Air freight of any liquid hazmat: neither — talk to your air freight specialist

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