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What goes wrong

It will not release

Updated

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A melt that has to be dug out reads as a defect even when the wax is perfect.

Straight walls with a deep fill

The worst combination, and also the most attractive one in a photograph. The wax grips along the full height and there is no taper to help it out, so the customer breaks it up in place.

A mouth narrower than the body

Any inward curve at the shoulder turns extraction into leverage. The wide 89-400 and 70-400 necks on this shelf exist precisely to avoid this, and they are 112 of the 224 containers.

Cooled too fast

Chilling can set the surface before the body has contracted, so the wax ends up stuck and cracked rather than pulled away cleanly. Slow, even cooling at room temperature usually releases better.

Too soft to hold together

A heavily loaded or soft wax breaks rather than lifting, which looks like a release problem and is actually a formula one. Firmer wax in a tapered tub is the combination that behaves.

Ask what the container is for

Several things on this shelf are candle jars, and a candle jar never has to give its contents back. Reading a jar as a melt cup because it is the right size is how this starts.

Empty one by hand before you commit

Set overnight, capped, then opened and emptied the way a customer will. If it needs a tool, pick a different container, because no instruction on the label fixes it.

Taper beats everything else here

If one property decides this, it is whether the walls open outward. A tapered PP tub releases a set melt with a push; a straight-sided jar of the same capacity and price does not, and the two listing photographs look equally good to anyone who has not poured either.

References

16 CFR 500.7, Net quantity of contents, method of expression, which requires the declaration to be in fluid measure if the commodity is liquid and in weight or mass if it is solid, semi-solid or viscous, unless a firmly established general consumer usage and trade custom says otherwise. law.cornell.edu
Written from federal regulation and from the catalog’s own material data, not from a pouring bench. Net quantity rules are federal and state weights and measures officials enforce their own programs alongside them. Anything here is a starting point rather than clearance for a specific label.