Acetonitrile, and the bottle size
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The requirement
Household glue removers in a liquid form containing more than 500 mg of acetonitrile in a single container. No percentage, no viscosity qualifier, no dosage form exception. A mass, in a container.
Which makes the arithmetic unusual
Concentration multiplied by fill volume. A remover at a given strength might sit under 500 mg in a 10 mL bottle and over it in a 30 mL one, so the answer differs across a range of the same product.
Nail glue remover is the product
Which is why this is a nail paragraph. It sits alongside the methacrylic acid entry as the second nail-specific item in the child-resistant packaging list.
So every size needs its own calculation
And a size added later needs one too. That is the specific failure this paragraph produces: a compliant small bottle, a larger bottle added for value, and nobody recomputes.
A smaller bottle is a genuine strategy here
Unlike a percentage threshold, a mass threshold can be managed by fill volume. That is a legitimate design response and it is worth knowing before committing to a size.
Acetonitrile is seriously toxic
Which is why the figure is low and why the paragraph exists. The packaging question sits on top of ordinary hazard communication duties for a shipped container of a hazardous chemical.
Check what your remover actually contains
Not every nail glue remover is acetonitrile-based, and some use acetone or other solvents instead. The paragraph names acetonitrile specifically, so the first step is the supplier specification rather than an assumption about the category.
Ask what the remover is actually built on
Acetonitrile, acetone and other solvents all appear in nail glue removers, and the paragraph names only acetonitrile. The supplier specification settles it in a line, and an assumption about the category settles nothing.