Containers

Closures

On this page11

What is on the shelf The spouted closure, for a concentrate The trigger sprayer, for ready to use The child resistant closure, where required The liner is doing the chemical work Necks worth designing around Two requirements pulling on the same neck Test the closed package the way it will live Threads above the fill line still see the product Specify the liner, do not inherit it References

In this category the closure carries more regulation than the bottle.

What is on the shelf

292 continuous thread, 43 dropper assemblies, 30 child resistant, 19 flip tops, 19 trigger sprayers, 18 spouted, 15 dome lids, 14 phenolic and 10 round tub lids.

The spouted closure, for a concentrate

It meters, it cuts off cleanly and it helps deliver the continuous coherent stream the regulation asks for. For a dilutable product it is the most useful closure on this shelf.

The trigger sprayer, for ready to use

Delivers the product where it is aimed, with no decanting and no measuring. The seals and the dip tube have to tolerate the formulation, which is where these fail.

The child resistant closure, where required

30 of them. Required only where the toxicity and residential use conditions are both met, and a system with the container and liner rather than a part you can swap.

The liner is doing the chemical work

It is in continuous contact with the product and it is usually a different material from the bottle. It fails before the container does and it is the component least often specified.

Necks worth designing around

24-410 at 198, 38-400 at 150, 20-410 at 107, 89-400 at 74, 20-400 at 65 and 45-400 at 54. The 89-400 entries are the wide mouths serving granular products.

Two requirements pulling on the same neck

Child resistance wants a specific finish; rinsability wants width. Where both apply, start from the finishes that offer both and work outward, because very few do.

Test the closed package the way it will live

Filled, closed, on its side, warm, for weeks, and then rinsed. That single test covers the seal, the liner and the rinse behaviour at once.

Threads above the fill line still see the product

Every time the bottle is tipped, product runs through the finish. A closure that seizes or a liner that swells shows up there first, and the customer meets it as a cap that will not come off.

Specify the liner, do not inherit it

It is usually a different material from both the bottle and the cap, it is the part in continuous contact with the contents, and it is almost always the component nobody named on the purchase order.

References

The Davis Pack Supply catalog, measured 18 October 2026. The growing inputs shelf is 1,075 rows: 579 containers and 496 closures, derived from three packaging archetypes across nine leaves. 276 PET, 203 HDPE, 85 glass, 14 PP and 1 LDPE, from 10 to 9,464 mL with a median of 125 and 42 containers at 1 litre or more. The closures include 30 child resistant, 19 trigger sprayers and 18 spouted.

40 CFR 165.25, standards for nonrefillable pesticide containers. A container for a non-hazardous pesticide complies with the DOT provisions applicable to a Packing Group III material. A container of 5 gallons or less holding a liquid pesticide must "allow the contents of the nonrefillable container to pour in a continuous, coherent stream" and minimise dripping. A rigid container of 5 gallons or less for a dilutable product must achieve "at least 99.99 percent removal of each active ingredient" under the prescribed test procedure. law.cornell.edu

40 CFR 157.22, child-resistant packaging for pesticides: "Unless exempted under 157.24, a pesticide product must be distributed and sold in child-resistant packaging" where it meets a toxicity criterion and "the product's labeling either directly recommends residential use or reasonably can be interpreted to permit residential use". The toxicity criteria include an acute oral LD50 of 1.5 g/kg or less, an acute dermal LD50 of 2000 mg/kg or less, an acute inhalation LC50 of 2 mg/litre or less, irreversible eye damage or corneal involvement persisting 21 days or more, and tissue destruction or severe skin irritation at 72 hours. law.cornell.edu

Written from 40 CFR 156.10, 165.25 and 157.22, and from the catalog as it stood on 18 October 2026. A pesticide may not be distributed or sold in the United States unless it is registered, and the label is approved as part of that registration; nothing here is a substitute for EPA guidance on a specific product, and whether a given product is a pesticide at all is a determination with consequences.