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Beyond the jar

Reed diffusers

By Dwight Davis, Founder

Updated

On this page5

The best-margin adjacent product in the category and the one with the most formulation trouble.

No heat, no flame

A reed diffuser works by capillary action: the base carries fragrance up the reeds and it evaporates from the exposed length.

No wick, no flame, no burn test. What replaces that testing is a slower and quieter problem, performance over weeks rather than hours.

The base is the product

A diffuser base is a specific solvent designed to travel up a reed at the right rate. Getting it wrong gives you a diffuser that smells of nothing after three days, or one that empties in a two weeks.

Buy a base formulated for the purpose rather than improvising with a carrier oil, which is too viscous to climb and is the standard first mistake.

Fragrance load is higher than in a candle, and the IFRA category is different again.

The vessel and the reeds

A narrow neck, which controls evaporation from the surface and stops the whole bottle escaping at once.

A closure for shipping, and a plug or collar that restricts the opening in use.

Reeds are rattan or fiber, and fiber reeds carry more consistently. Either way the customer flips them, which is worth putting in the instructions.

And a warning about spills: diffuser base damages finished surfaces, and a knocked-over diffuser on a table is a genuine complaint.

The commercial case

High perceived value, low material cost, no flame, and it sells to the same customer for the same reason.

The catch is shipping: a full bottle of liquid is heavy and it leaks, so the closure and the pack matter more than for any other product in the range.

References

No published source. This page is written from practice rather than from published guidance. No extension service or agency publishes on this question for candles, so nothing here is cited, and it should be weighed as experience and not as a standard.
Written from the federal regulation, the CPSC material and the published scope of the ASTM candle standards. The standards themselves are copyrighted documents that must be bought; what is described here is their scope and requirements as published, not their text. Your own burn testing against your own vessel and wick is what establishes whether a candle you made is safe.