Papaverine Base Pure Powder from Canada
Papaverine base, the free alkaloid without salt formation, extracted from opium or synthesized, used in research and as intermediate for salt production. HTS 2939.19.10.00 includes the parent alkaloid 'papaverine and its salts' explicitly. Supplied as analytical reference standard or bulk chemical.
Duty Rate — Canada → United States
0%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Base form highly sensitive to oxidation; import with nitrogen-flushed packaging and stabilizer declaration per chapter note (f)
• Provide alkaloid identity by NMR/IR; distinguish from noscapine (also 2939.19 but separate suffix)
• Research quantities (<1kg) still require end-user certificates; avoid medicinal claims to prevent 3003 shift