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    HomeProductsLife ScienceFood AdditivesPotassium Sodium Tartrate CAS 304-59-6
    • Potassium Sodium Tartrate CAS 304-59-6

    Potassium Sodium Tartrate CAS 304-59-6

    Potassium Sodium Tartrate (CAS 304-59-6), historically and commercially famous as Rochelle Salt or Seignette Salt, is a double salt of tartaric acid utilizing its strong complexing ability to regulate metal ion deposition in industrial applications. Chemically identified as Potassium sodium L-tartrate, this colorless to white crystalline powder functions as a pH regulator and a sequestering agent. Due to its large piezoelectric crystals, it has historical significance in acoustics, but in modern bulk trade, it is extensively integrated into the Food Industry as a leavening acid (E337) and stabilizer in cheese products, and into the Electroplating Industry as a complexing agent for copper plating baths to ensure smooth, uniform coatings. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific mesh sizes and purity standards (e.g., Food Grade / Tech Grade). Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols.

    • CAS: 304-59-6
    • Synonyms: Rochelle salt, Seignette salt, Potassium sodium L-tartrate, Sodium potassium tartrate
    • Einecs: 206-156-8
    • Molecular Formula: C4H4KNaO6·4H2O
    • Grade: Food Grade (E337) / Tech Grade / Electroplating Grade / USP
    • Package: 25kg/Kraft Paper Bag or Woven Bag with PE inner liner
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    Product Description

    Potassium Sodium Tartrate, also widely known as Rochelle Salt, is a double salt of tartaric acid. It appears as colorless to white, translucent crystals or a white crystalline powder with a cool, saline taste. It acts as a chelating agent and buffer in various industrial and food applications.

    Our product is produced through a high-precision neutralization process, ensuring high purity (≥99%) and excellent solubility. It is a critical raw material in the electroplating industry for copper plating, in the food industry as a stabilizer and leavening agent, and in the chemical industry for mirror silvering. We guarantee low heavy metal content and strict adherence to international quality standards suitable for export.

    1 Physicochemical Properties
    2 Applications
    3 Storage Conditions
    4 Safety Precautions

    Physicochemical Properties

    The following specifications are based on our standard export quality (Food/Tech Grade):

    Test ItemSpecification (Standard)
    AppearanceColorless crystals or white crystalline powder
    Assay (Purity)99.0% – 102.0%
    AlkalinityPasses Test
    Loss on Drying (at 150°C)21.0% – 26.0% (Tetrahydrate)
    pH Value (5% Solution)6.5 – 8.5
    Heavy Metals (as Pb)≤ 10 ppm
    Arsenic (As)≤ 3 ppm
    Chloride (Cl)≤ 350 ppm
    Sulfate (SO4)≤ 500 ppm
    Iron (Fe)≤ 10 ppm
    SolubilitySoluble in water (1g/ml); Insoluble in alcohol
    Specific Gravity1.79 g/cm³

    Applications

    Potassium Sodium Tartrate is a multifunctional ingredient used across several key industries:

    1. Electroplating Industry:
      • Used as a complexing agent in alkaline copper plating systems. It helps regulate the pH and promotes the formation of smooth, dense, and uniform metal coatings.
    2. Food Industry:
      • Leavening Agent: Often combined with sodium bicarbonate in baking powders.
      • Stabilizer: Used in cheese processing, meat products, and jams to maintain texture and pH balance.
      • E-Number: Listed as food additive E337.
    3. Chemical & Mirror Industry:
      • Mirror Silvering: acts as a reducing agent in the silvering process for mirrors.
      • Chemical Reagent: Essential component in the preparation of Fehling’s Solution (used to test for reducing sugars).
    4. Pharmaceutical & Personal Care:
      • Used as a saline cathartic (laxative) in some medicinal formulations.
      • Used in crystal microphones and piezoelectric devices (due to its piezoelectric properties).

    Storage Conditions

    • Environment: Store in a cool, dry, and well-ventilated warehouse.
    • Temperature: Recommended storage temperature is below 25°C.
    • Sensitivity: The product slightly effloresces in warm, dry air (loses water of crystallization). Keep the packaging tightly sealed.
    • Separation: Store away from toxic and hazardous substances.

    Safety Precautions

    • Handling: Wear standard protective equipment (gloves, safety glasses) to avoid dust irritation.
    • Toxicity: It is considered non-toxic and safe for general handling (GRAS for food use).
    • Eye Contact: Flush with plenty of water if dust gets into the eyes.
    • Skin Contact: Wash with soap and water.
    • Transport: Non-hazardous goods for air, sea, and road transport.

    FAQ - Technical & Supply Chain

    • Q:

      How is Potassium Sodium Tartrate CAS 304-59-6 utilized in the electroplating industry?

      A: Potassium Sodium Tartrate (CAS 304-59-6) acts as a crucial complexing agent (chelator) in alkaline plating baths (especially cyanide-free copper plating); it controls the concentration of free metal ions, preventing precipitation and ensuring a fine-grained, bright metal deposit.
    • Q:

      Is this ingredient suitable for food applications?

      A: Yes, as Food Additive E337, it is typically applied as a buffer and stabilizer in cheese processing, meat products, and jams, and serves as a component in some baking powders to control the release of carbon dioxide.
    Documents

    Documents and Product Support

    For product review and sourcing evaluation, supporting documents can be coordinated according to the product type, inquiry stage, and order requirements.

    • COA for batch-based quality reference
    • TDS for key physical and chemical information
    • SDS / MSDS for handling, storage, and safety reference
    • Packing information for sample, trial, and bulk orders
    • Technical communication based on application and specification requirements
    Quotation

    Information to Confirm Before Quotation

    Clear sourcing information helps reduce specification mismatch and allows a more accurate quotation before sample or bulk order discussion.

    • Product name and CAS number
    • Application or intended end use
    • Required purity, grade, or specification
    • Sample quantity, trial order, or bulk demand
    • Preferred packing form or net weight
    • Destination country or port
    • Required documents or compliance expectations
    Storage & Handling

    Packaging, Storage, and Handling Notes

    Packaging form, storage conditions, shelf life, and shipment arrangements should be confirmed according to the product characteristics, package size, and destination requirements.

    Before order confirmation, buyers are advised to review the corresponding product documents and confirm whether any special storage, labeling, or handling requirements apply.

    Supply Support

    Sample, Bulk Order and Repeat Supply Support

    Support can be arranged for sample discussion, bulk supply planning, packaging confirmation, and routine sourcing communication based on the actual product and order requirements.

    For repeat-use formulations or long-term procurement plans, buyers may discuss specification consistency, packaging preferences, delivery expectations, and document coordination in advance.

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    Tags:

    Buffering Agent Chelating Agent Food Ingredient Tartrate Salt

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