The subject product, Glycacil SG Perservative is a preparation containing 6% of the active ingredient, iodopropynyl butylcarbamate (IPBC), in a proprietary solvent. Glycacil SG Perservative is an Environmental Protection Agency (EPA)-registered fungicide and is indicated as an intermediate preparation that will be used to manufacture other household goods.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N019243