The brush cap that is not on the shelf

What the shelf is

Twenty-eight glass containers from 14.787 to 29.573 mL, with 60 closures. Of those 60, 48 are continuous thread caps and 12 are phenolic. None is a brush cap, which for this product is the component that makes it a product.

The catalog does hold brush caps

Four of them, all polypropylene: on 18-400, 18-410, 20-400 and 28-400. The dominant finish on this shelf is 20-400 at 20 of the 28 containers, and 18-400 accounts for 4 more, so two of the four brush caps match the bulk of the shelf.

And they are already paired in our fit data

The brush caps are recorded as closures with a brush dispensing type, and our closure fit data already holds 92 pairings for them, covering 26 of the 28 containers on this shelf. The match exists and is verified.

So why are they not here

Because the process constraint for nail polish records it as dispensed by none, and the shelf builder uses that to decide which dispensing types a closure may have. A brush is not a none, so the brush is filtered out.

Which is a data error, not a gap

Nothing is missing from the catalog and nothing is missing from the pairing data. One constraint row says nail polish is dispensed by nothing, and nail polish is dispensed by a brush. We would rather publish that than let the shelf imply we have no brush caps.

What to do in the meantime

Shop the brush caps directly rather than from this shelf, and match them by finish: 18-400, 18-410, 20-400 or 28-400. Twenty of the 28 bottles here are 20-400, which is the obvious pairing.

The same fault affects three other formats

A roll-on, a deodorant stick and a solid perfume tin each have an archetype whose shelf does not contain the component the format needs. Those properties name their missing parts too, for the same reason.

References