Potassium Sodium Tartrate Crystals (Rochelle Salt)
Pure potassium sodium tartrate, also known as Rochelle salt, is a double salt of tartaric acid with potassium and sodium. It falls under HTS 2918.13.3000 as a salt of tartaric acid with alcohol function but without other oxygen functions, meeting Chapter 29 requirements for chemically defined organic compounds. Commonly supplied as white crystalline powder for laboratory and industrial applications.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If pure tartaric acid rather than its salt
Tartaric acid itself (not salts/esters) is classified under the specific tartaric acid subheading earlier in numerical order.
If formulated as mineral plant growth fertilizer
Mixtures containing tartrates put up as fertilizers fall under Chapter 31, excluding pure chemical compounds of Chapter 29.
If supplied as aqueous solution exceeding transport safety limits
Solutions not qualifying under Chapter 29 note (d) or (e) for safety/transport may be classified as chemical preparations.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Verify purity certificate (typically 99%+ assay) as impurities may affect classification under Chapter 29 note (a)
• Include chemical analysis report and CAS number (304-59-6) in documentation to confirm identity as Rochelle salt
• Ensure packaging prevents moisture absorption, as caking could lead to quality disputes at customs
Related Products under HTS 2918.13.30.00
Rochelle Salt for Piezoelectric Crystals
Specialty potassium sodium tartrate grown into large single crystals for piezoelectric applications in early microphones and transducers. Falls precisely under HTS 2918.13.3000 as the named Rochelle salt, a tartaric acid salt with defined chemical structure per Chapter 29.
Technical Grade Rochelle Salt Powder
Industrial-grade potassium sodium tartrate (min 98% purity) for electroplating baths and metal cleaning applications. HTS 2918.13.3000 specifically names this compound as a tartaric acid salt, qualifying under Chapter 29 for separate chemically defined organic compounds.
Stabilized Rochelle Salt with Anti-Caking Agent
Potassium sodium tartrate with food-grade anti-caking stabilizer added for preservation during transport. Qualifies under HTS 2918.13.3000 and Chapter 29 note (f) as the defined compound with stabilizer necessary for transport. Maintains free-flowing properties in humid conditions.
Rochelle Salt for Silvering Mirrors
High-purity potassium sodium tartrate used in traditional mirror silvering solutions as reducing agent. Specifically named under HTS 2918.13.3000 as Rochelle salts, the double tartrate essential for depositing silver films. Supplied in moisture-proof containers.
Bulk Rochelle Salt Dihydrate USP
Pharmaceutical bulk potassium sodium tartrate tetrahydrate (dihydrate formula KNaC4H4O6·4H2O) meeting USP monograph. Classifies under HTS 2918.13.3000 as the specifically named Rochelle salt of tartaric acid. Used in bulk for tablet compression and syrup formulation.
Rochelle Salt Pharmaceutical Grade
High-purity potassium sodium tartrate meeting USP standards for use in pharmaceutical formulations and as a sequestrant. Classified under HTS 2918.13.3000 as the specific salt of tartaric acid per the tariff description. Its dihydrate crystal structure provides mild laxative and buffering properties in medicinal products.