Calcofluor White P Fluorescent Agent from Mexico
Calcofluor White P serves as a synthetic organic fluorescent brightener for microbial staining in labs and cotton pre-treatment in textiles. Under HTS 3204.20.80.00 as other fluorescent brightening agents, it binds to cellulose emitting blue fluorescence. Dual use in biotech and textile whitening.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Dual-function products need end-use letters specifying textile vs lab predominance
• Biohazard labeling if for microbial use, plus EPA registration if pesticide-like
• Purity >98% typical; diluted forms risk 3824 reclassification