The liner is the one to watch here. Because it is chosen by accident.
Landing on an induction seal closure by choosing a neck finish
63 of the 255 closures on this shelf record a heat induction seal liner, which is designed to be bonded to the rim by a machine. Selecting on thread size alone will reach one of them eventually.
Choosing a pressure sensitive liner for a jar that gets opened daily
31 closures record one. A pressure sensitive liner is designed to adhere on contact and for a single application, which is the wrong fit for a sorted set that is accessed constantly.
Reading a blank liner field as No Liner
27 closures record No Liner and 31 record nothing. Collapsing the second into the first turns thirty one unknowns into thirty one claims, and the shelf went to the trouble of keeping them apart.
Assuming this group sees the whole shared shelf
It sees 181 containers of 251. Seventy are missing, and only thirty five of those are explained by the 355 mL ceiling, so half the gap is a routing decision rather than a size one.
Concluding from that gap that the other seventy cannot be had
They are on nine other shelves in this same catalog. What a curated shelf omits is a fact about the shelf, and treating it as a fact about supply is the recurring error this library keeps flagging.
Putting pins and template parts in the same jar
A flat template has to be shaken or tipped out and a pin should not be. The two leaves want opposite actions from the same container, which is resolved with two containers rather than one compromise.
Expecting a closure here to be child resistant
None on this shelf is recorded as such. That is a statement about the record and about this shelf, and nothing on these pages goes further than it.
And reading part 1610 as a rule about any of this
It classifies the flammability of clothing textiles by how fast a flame crosses a two inch by six inch specimen. It is the spine of this property because of how it handles a non-uniform article and a thin result, not because it reaches a clip or a blade.
References
The Davis Pack Supply catalog, measured 19 October 2026. The 255 closures on this shelf record twelve different liner values: 63 heat induction seal, 42 F217, 31 with no record at all, 31 pressure sensitive, 27 recorded affirmatively as No Liner, 21 Plastis standard, 19 PE foam, 15 foam, 3 polycone, and one each of Plastis pasteur, F828 and PPE. The convention varies by closure family: the 169 continuous thread polypropylene lids carry eight different values, led by 62 heat induction seal and 30 pressure sensitive; the 39 metal or aluminum CT caps are dominated by 21 Plastis standard; the 22 PP dome lids are 11 F217 and 8 No Liner. The record states the liner type and not what it will achieve in any particular use.
The Davis Pack Supply catalog, measured 19 October 2026. This group draws on 181 containers and 255 closures, a strict subset of the 251 and 288 that nine groups share identically, with no rows of its own. The 70 excluded containers run from 36.967 to 500 mL with a median of 384, and 35 of the 70 are above this shelf’s 355 mL ceiling while 35 sit inside its capacity band. By family the exclusions are 25 PET single wall jars, 8 PP round tubs, 7 glass mason and paragon jars, 7 glass hex jars, 6 glass straight sided jars, 6 PP single wall jars, 3 French squares and 2 plastic spice bottles. The sewing notions property enumerates the full shelf.
16 CFR 1610.7(b)(1). A preliminary classification of Class 1 is assigned when "There are no burn times", or "There is only one burn time, and it is equal to or greater than 3.5 seconds", or "The average burn time of two or more specimens is equal to or greater than 3.5 seconds". Five further specimens are tested where there is one burn time under 3.5 seconds or an average under 3.5 seconds. Then: "Stop testing and assign the final classification as Class 3, Rapid and Intense Burning, only when there are two or more burn times with an average burn time of less than 3.5 seconds". And: "If there is only one burn time out of the 10 test specimens, the test is inconclusive. The fabric cannot be classified."
law.cornell.edu 