Containers

Closures

On this page11

What is here The 44, and why they are the interesting number Which is the shelf being right where the rule was wrong The droppers for stains and indicators Phenolic where the liner has to resist something And the liners themselves Dome lids for the jars Loose covers for crystal growing Standardize the neck for a class set And buy spares, because a classroom loses caps References

44 child resistant closures on a shelf whose archetype records child resistance as not required.

What is here

373 continuous thread, 44 child resistant, 32 dropper assemblies, 27 dome lids, 27 spouted, 19 flip top, 14 phenolic, 10 liners and sealing discs, 9 specialty, 7 buttress, 3 dropper tips and caps and 3 euro droppers.

The 44, and why they are the interesting number

The archetype says child resistance is not required, which is true of a laboratory with controlled access and false of a kitchen. The shelf carries them anyway.

Which is the shelf being right where the rule was wrong

Two of the six leaves are a child doing chemistry at home. For those two, a child resistant closure is the single most useful thing on this page.

The droppers for stains and indicators

32 assemblies plus 3 tips and caps and 3 euro droppers. An indicator is dosed by the drop and a dropper that is also the closure is one fewer thing to lose in a classroom.

Phenolic where the liner has to resist something

14 of them. For a solvent-borne mountant or a strong reagent, the phenolic cap is the traditional answer and a small set.

And the liners themselves

10 liners and sealing discs. For a specimen jar holding a fixative, the liner is what stands between the contents and the air in the cupboard, which the exposure limits are all about.

Dome lids for the jars

27 of them, wide and quick. For a specimen opened in a lesson or a crystal jar checked daily, a lid that comes off in one movement is the usable choice.

Loose covers for crystal growing

Which is not a product category. The honest answer is a lid left ajar or a paper cover, because evaporation is the mechanism and a seal defeats the experiment.

Standardize the neck for a class set

51 containers at 24-410, 38 at 70-400, 34 at 89-400. One bottle neck and one jar neck across a cupboard means one box of spare caps.

And buy spares, because a classroom loses caps

Thirty students, one lesson, and a cap on a bench. The closures are consumables here in a way they are not in a laboratory.

References

The Davis Pack Supply catalog, measured 18 October 2026. The classroom and home lab shelf is 987 rows: 414 containers and 573 closures. 5 mL to 946 mL with a median of 120; 71 containers at 30 mL or under, 211 at 120 or under, 335 at a pint or under. 154 HDPE, 130 glass, 117 PET, 13 PP. 259 bottles, 150 jars, 3 jugs, 2 tubes. 109 white, 105 clear, 57 natural, 54 amber. Closures: 373 continuous thread, 44 child resistant, 32 dropper assemblies, 27 dome lids, 27 spouted, 19 flip top, 14 phenolic, 10 liners and sealing discs, 9 specialty, 7 buttress, 3 dropper tips and caps, 3 euro droppers.

The archetype behind this shelf is ind-lab: 10 to 1,000 mL, narrow mouth, glass and HDPE, cold fill, thin, aqueous, with no dispensing requirement and child resistance recorded as not required. Its stated reason is "reagent or sample. Autoclavability and chemical resistance." Our catalog does not record autoclavability for any product, and of the two materials named only glass is generally autoclavable.

29 CFR 1910.1048. Paragraph (c)(1) requires that no employee be exposed above "0.75 parts formaldehyde per million parts of air (0.75 ppm) as an 8-hour TWA"; (c)(2) that none be exposed above "two parts formaldehyde per million parts of air (2 ppm) as a 15-minute STEL"; and paragraph (b) defines the action level as "a concentration of 0.5 part formaldehyde per million parts of air (0.5 ppm)" as an eight-hour time-weighted average. law.cornell.edu

Written from 29 CFR 1910.1048 and from the catalog as it stood on 18 October 2026. No autoclave cycle is quoted and no container is described as autoclavable, because our data does not record it. School district and state rules on classroom chemicals exist, vary, and are not summarized here.