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Diffusers
All Containers›Shop by use case›Diffusers›The reed diffuser›The open neck, and what it rules outShop all diffusers →
The reed diffuser

The open neck, and what it rules out

By Dwight Davis, Founder

Updated

On this page8
A reed diffuser has no closure while it is doing its job, and both of the obvious compliance routes assume one.

The conflict, stated plainly

If a blend crosses a threshold in 1700.14(a), the answer is special packaging or a permanently attached spray device. A reed diffuser offers neither once it is in use. The format and the formula are then in conflict, and the formula is usually the thing that should move.

Shipping closed is not using closed

Bottles ship with a cap and the customer removes it to fit the reeds. A closure that satisfies a rule in the carton and is discarded on the kitchen counter has not addressed what the rule is about.

So pick the ingredients for the format

Which is a cheerful conclusion rather than a sad one. Plenty of fragrance materials sit nowhere near 5 percent methyl salicylate or 10 percent hydrocarbons, and a blend built with the format in mind never reaches this question.

Open necks lose volatiles unevenly

The lightest notes go first, so the scent at week six is not the scent at day one. That is inherent to evaporative dispensing, and it is worth saying in the product copy rather than being surprised by it in a review.

And they spill

An open bottle of oil on a shelf is a stain risk on wood and on painted surfaces. A heavier base, a narrower neck and a word in the instructions about where to stand it are all cheaper than a complaint.

Hanging and car formats are the same argument

Both are open or semi-open vials in motion, which makes the volume small and the seal during transport more important than any other property. The smallest bottles on this shelf exist for exactly those two uses.

A format that is honest about itself

Nothing here is a flaw to engineer around. An evaporator with an open neck is what a reed diffuser is, and the useful response is to choose ingredients and a bottle that suit it rather than to look for a closure that makes the conflict go away.

References

16 CFR 1700.14, Substances requiring special packaging, under the Poison Prevention Packaging Act regulations. Paragraph (a)(3) covers liquid preparations over 5 percent methyl salicylate; (a)(7) illuminating preparations at 10 percent petroleum distillates; (a)(31) and (a)(32) hazardous substances, and drugs and cosmetics, at 10 percent or more hydrocarbons by weight and under 100 SUS at 100 F, each with an exemption for packages whose only non-child-resistant access is a spray device. law.cornell.edu
16 CFR 1700.15, Poison prevention packaging standards. Paragraph (a) requires the packaging to keep working in actual contact with the substance and across the openings and closings customary for its size and contents; (b) sets child-resistant effectiveness at not less than 85 percent without a demonstration and 80 percent after one; (c) forbids reuse; (d) restricts flow to 2 milliliters per activation. law.cornell.edu
Written from federal regulation, not from a formulation bench. Whether a given formula crosses a threshold in 16 CFR 1700.14 is a question about your formula, and the percentages here are the test rather than the answer. Anything on these pages is a starting point and not clearance for a specific product.