From formula to bottle
Updated
On this page9
One: methacrylic acid, as a percentage
More than 5 percent weight to volume in a single retail package. Weight-to-volume is a specific basis, so the figure has to be computed that way rather than taken from a weight-for-weight batch sheet.
Two: the acetonitrile figure, which is a mass
The glue remover trigger is expressed per container rather than as a concentration, so the calculation is the strength multiplied by the fill volume and it has to be redone for every size you sell.
Three: decide the format, knowing one exemption is a format
A pen-like applicator holding no free liquid is outside the methacrylic acid requirement. A bottle of the same product is inside it. That is a genuine design choice with a regulatory consequence.
Four: if a threshold is crossed, the packaging has to perform
16 CFR 1700.15 asks for not less than 85 percent child-resistant effectiveness without a demonstration and 80 percent after one, and for the packaging to keep working in actual contact with the substance and across the openings and closings customary for its size.
Which is a real ask for a nail product
A polish or a treatment is opened and closed many times, and the solvents attack liner materials. Effectiveness after contact and after repeated use is the part a datasheet will not tell you.
Five: label it as a cosmetic where it is one
A polish, a cuticle oil and a treatment are cosmetics, with ingredients declared in descending order of predominance. A remover sold on its solvent content may also need the hazard statements in 16 CFR 1500.14.
Keep the calculations, per size
The methacrylic percentage and the acetonitrile mass, computed for each fill volume you offer, with the date. Adding a size reopens both, and that is the specific thing that gets forgotten.
Two of the five answers are per size
Which makes the compliance file a table rather than a page. A range of three fill volumes is three acetonitrile calculations, and the one added last is the one nobody runs.