A bigger bottle crossed a line

How it happens

A glue remover sells well in a small bottle, a customer asks for better value, and a larger size is added. The acetonitrile trigger is more than 500 mg in a single container, so the larger size can be over the line while the smaller one is under it.

Which is counterintuitive

Almost every other threshold in this library is a percentage, and a percentage does not move when the bottle does. A mass per container is the exception and it catches people exactly because of that.

The same product, two answers

So a range can have one size requiring special packaging and another not, which is correct and looks like an inconsistency. Treating the range as one regulatory object is the mistake.

And nobody recomputes on a size extension

A new size feels like a packaging decision, not a formula change, so the compliance file is not reopened. That is the specific organizational failure this paragraph produces.

Methacrylic acid does not behave this way

It is a percentage, weight to volume, in a single retail package, so the bottle size does not change it. Knowing which of your triggers is a mass and which is a concentration is the useful distinction.

Shrinking the bottle is a legitimate answer

Where a mass threshold is the problem, fill volume is a lever. That is worth considering alongside child-resistant packaging rather than treating the packaging as the only option.

Recompute per size, and date it

Concentration times fill volume, for every size, written down. It is one line of arithmetic and it is the whole control.

Know which of your triggers move with the bottle

Mass-per-container triggers move; percentage triggers do not. Writing that distinction at the top of the compliance file is a one- line control that prevents the whole failure.

References