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Wax melts
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The pour

Fragrance load

By Dwight Davis, Founder

Updated

On this page8
Fragrance load is not only a scent decision. It moves the number on your label.

It changes the density

Fragrance oil and wax do not weigh the same, so a higher load changes what a given fill volume weighs. If the load changes, the measured fill weight has to be measured again rather than carried over.

It changes the set

Heavily loaded wax can stay soft, sweat oil onto the surface or set with a different texture, all of which affect how the melt comes out of the container and how it looks through a clear jar.

Oil attacks some plastics

The same fragrance chemistry that softens closures elsewhere in this library is in contact with the container here for months. PP and glass are the comfortable choices; a clear PET jar has the temperature problem before it has this one.

More is not more throw

Past the point the wax can hold, extra oil sits on the surface and in the headspace rather than releasing gradually in a warmer. The ceiling is a property of the wax, and the supplier of the wax is the right source for it.

Record it as a percentage by weight

Because that is the only form in which it is comparable between batches and the only form that connects to the fill weight. Drops and parts do not survive a scale-up.

And relabel when it moves

A reformulation that changes the load changes the declared weight, which is a label change rather than a recipe change. Catching that at the bench is cheap; catching it at a weights and measures check is not.

It is the variable that touches everything else

Density, set, release, throw and the declared weight all move with it, which makes it the one number to fix early and change reluctantly. A load chosen by taste and then adjusted repeatedly drags the label along behind it.

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
16 CFR 500.25 and 500.27, on permitted variations from the stated quantity and on how a multiunit package declares the count, the quantity of each unit and the total. 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.