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Hazmat packaging
All Containers›Shop by use case›Hazmat packaging›Containers›ClosuresShop all hazmat →
Containers

Closures

By Dwight Davis, Founder

On this page11
A tested design includes its closure. Swapping it ends the certification.

What is here

175 continuous thread, 12 child resistant, 11 round tubs, 10 dome lids, 10 tub and pail lids, 5 flip top, 3 liners and sealing discs, 3 spouted, 2 phenolic and 1 metal lug cap, 1 metal overshell lid and 1 dairy lid.

More closures than containers, by three to one

234 against 75. Which reflects a shelf of industrial containers with many compatible closure options rather than a tightly matched set.

For specification packaging the closure is not optional

A UN packaging is tested as an assembly. The closure that was on it during the test is part of the design type, and a different one is a different assembly.

Which is why you buy the system

Drum and closure together, from the supplier who tested and marked them. Mixing a marked container with a closure from elsewhere is the mistake this page exists to name.

And why we are not that supplier

We record neither the mark nor the tested assembly. For a regulated shipment that is disqualifying and it should be.

For the unregulated half, the usual rules apply

Liner specified by name, chemical compatibility checked against the resin chart, and a closure that suits how often the container is opened.

Tub and pail lids for the absorbent

10 of them, with 11 round tub closures. A bulk absorbent container is opened in a hurry during a spill, so a lid that comes off fast matters.

Three liners and sealing discs

Which is thin for a chemical context. For anything volatile or aggressive, the liner is the part in contact and it is the part to specify.

Two phenolic closures

The traditional resistant cap, and two is the count. For a strong solvent or acid that is a very small set.

Buttress and large threads for the pails

A five gallon pail uses a different closure family from a bottle, and the 10 tub and pail lids here are what matches them.

References

The Davis Pack Supply catalog, measured 19 October 2026. The hazmat shelf is 310 rows: 76 containers and 234 closures, the smallest container count of any property in this library. 500 mL to 18,927 mL with a median of 2,514; 65 containers over a quart, 34 over a gallon and 6 at five gallons. 60 HDPE, 14 PP, 2 LDPE, and no glass, PET or steel. 30 tubs and pails, 23 bottles, 12 jars, 11 jugs. 46 white, 23 natural, 4 black, 2 clear. Closures: 175 continuous thread, 12 child resistant, 11 round tubs, 10 dome lids, 10 tub and pail lids, 5 flip top, 3 liners and sealing discs, 3 spouted, 2 phenolic.
49 CFR 178.503(a), marking of UN specification packagings. In sequence: the United Nations symbol "as illustrated in paragraph (e)(1)(i)", or the letters UN on embossed metal receptacles; the packaging identification code designating type, material and category, with the letters V or W where applicable; a letter identifying the performance standard; the specific gravity or mass tested for; the test pressure or the letter S; "The last two digits of the year of manufacture"; the authorizing country, for example USA; "The name and address or symbol of the manufacturer"; and for reusable drums and jerricans the material thickness in millimetres. The example markings at (e)(2) are given as images rather than text. law.cornell.edu
Written from 49 CFR 178.503 and from the catalog as it stood on 19 October 2026. No specimen UN mark appears here, because the regulation gives its examples as images rather than as text. Nothing in this catalog is offered as UN specification packaging: we do not record whether a container carries a mark, and the mark belongs to a tested design type and is applied by its manufacturer. Packing group determinations, shipping names and documentation are the shipper's.