Rochelle Salt for Piezoelectric Crystals
Rochelle salt for piezoelectric crystals is high-purity potassium sodium tartrate grown into large single crystals. It is a separate chemically defined compound with an alcohol function, classified under the tariff item for salts of tartaric acid. These crystals are used in early microphones and transducers.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the crystals are shaped as optical elements
Optical elements, such as those made of ethylenediamine tartrate, are excluded from Chapter 29 and classified in Chapter 90.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Confirm that the crystals are not considered optical elements, which would be excluded from Chapter 29
• Provide technical specifications and purity data to CBSA
• Ensure the product is not put up in forms for retail sale that might change classification
Related Products under Tariff item 2918.13.00
Ammonium Bitartrate
Ammonium bitartrate is a salt of tartaric acid used in wine stabilization and as a laboratory reagent. It is a separate chemically defined compound with an alcohol function, classified under the tariff item for salts of tartaric acid. The bitartrate form retains the carboxylic acid and alcohol functions characteristic of tartaric acid.
Bulk Baking Stabilizer Potassium Bitartrate
Industrial food processing grade cream of tartar in bulk 50lb sacks for meringue production and candy manufacturing. It is a chemically defined potassium salt of tartaric acid, classified under this tariff item.
Bulk Rochelle Salt Dihydrate USP
Pharmaceutical bulk potassium sodium tartrate tetrahydrate (dihydrate formula KNaC4H4O6·4H2O) meeting USP monograph. It is classified under this tariff item as a specifically named Rochelle salt of tartaric acid.
Calcium Tartrate Dihydrate
Calcium tartrate dihydrate is the calcium salt of tartaric acid, used as a food additive and stabilizer in beverages and confectionery. It is a separate chemically defined compound with an alcohol function, classified under the tariff item for salts of tartaric acid. The dihydrate form is a stable crystalline product.
Dibutyl Tartrate
Dibutyl tartrate is an ester of tartaric acid used as a plasticizer in resins and as a solvent. It is a separate chemically defined compound with an alcohol function, classified under the tariff item for esters of tartaric acid. The ester retains the carboxylic acid and alcohol functions characteristic of tartaric acid.
Diethyl Tartrate
Diethyl tartrate is an ester of tartaric acid used as a chiral building block in organic synthesis and fragrances. It is a separate chemically defined compound with an alcohol function, classified under the tariff item for esters of tartaric acid. The ester is a clear, colorless liquid.