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    HomeProductsBasic & Fine ChemicalsInorganic ChemicalsSodium Tetraborate Decahydrate CAS 1303-96-4
    • Sodium Tetraborate Decahydrate CAS 1303-96-4

    Sodium Tetraborate Decahydrate CAS 1303-96-4

    Sodium Tetraborate Decahydrate (CAS 1303-96-4), commonly known as borax decahydrate, is a highly versatile granular crystalline compound widely utilized across heavy industrial and agricultural sectors. As an excellent alkaline buffer and mild flux, this stable borate mineral is essential for reducing the melting point in glass manufacturing, ceramic glazes, and metallurgical casting. Additionally, it serves as a critical boron micronutrient source in agricultural fertilizer blends. Unlike lower-grade alternatives that suffer from rapid efflorescence (loss of hydration), our sodium borate decahydrate is carefully processed and packed in moisture-controlled barriers to ensure absolute compound stability and precise boron content. We are fully equipped to manage reliable bulk supply for global manufacturers. By partnering with us, clients unlock competitive factory pricing, flexible customized specifications for various mesh sizes, and full shipment transparency supported by comprehensive MSDS, TDS, COA documentation.

    • CAS: 1303-96-4
    • Synonyms: Borax decahydrate, Sodium borate decahydrate, Disodium tetraborate decahydrate, Borax 10H2O, Sodium biborate.
    • Einecs: 215-540-4
    • Grade: Industrial Grade
    • Package: 25kg/bag, 50kg/bag, or 1000kg jumbo bag.
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    Product Description

    1 Technical Data (Physicochemical Properties)
    2 Applications
    3 Storage & Safety
    4 Quality Assurance

    Technical Data (Physicochemical Properties)

    PropertyIndustrial Standard Specification
    AppearanceWhite crystalline powder or granules
    Assay ≥ 99.5%
    Boron Trioxide 36.5% – 38.0%
    Sodium Oxide 16.0% – 16.5%
    pH Value (0.1% solution)9.2 – 9.5
    Insoluble Matter≤ 0.04%
    Sulfate ≤ 0.1%
    Chloride ≤ 0.05%
    Iron ≤ 0.002%

    Applications

    • Glass & Ceramics: Essential in the production of borosilicate glass, fiberglass, and ceramic glazes to improve mechanical strength and chemical resistance.
    • Metallurgy: Used as a flux in gold recovery, brazing, and soldering to dissolve surface oxides and lower melting temperatures.
    • Industrial Detergents: Functions as a pH buffer, water softener, and enzymatic stabilizer in heavy-duty cleaning formulations.
    • Agriculture: Applied as a micronutrient fertilizer in boron-deficient soils to support cell wall synthesis in high-yield crops.

    Storage & Safety

    Sodium Tetraborate Decahydrate should be stored in a cool, dry, well-ventilated area. It is slightly efflorescent (loses water of hydration) in very dry air, so airtight packaging is necessary to prevent clumping and maintain the 10H2O stoichiometry. PPE Recommendations: Operators should use dust-proof masks (N95 or equivalent), safety glasses with side shields, and nitrile gloves to prevent respiratory irritation and skin dryness during bulk handling.+1

    Quality Assurance

    Our facility utilizes automated crystallization and drying technologies to ensure precise control over the hydration state of the decahydrate crystal. Purity is verified through acid-base titration and ICP-OES for trace metal analysis, ensuring compliance with international industrial standards. We implement a rigorous batch-tracking system that aligns with ISO 9001 quality management frameworks, guaranteeing that the chemical performance remains consistent from the reactor to the end-user’s formulation.

    FAQ - Technical & Supply Chain

    • Q:

      How can the identity of Sodium Tetraborate Decahydrate be distinguished from the Pentahydrate version?

      A: The identity of CAS 1303-96-4 is verified by its specific B2O3 content (approx. 37%) and its theoretical water of crystallization weight loss; the Decahydrate contains ten moles of water, resulting in a lower boron concentration by weight compared to the more concentrated Pentahydrate (5H2O) form.
    • Q:

      Is this Borax decahydrate typically applied as a standalone flux or as part of a multi-component formulation in metallurgy?

      A: While it is commonly used as a standalone flux in basic gold smelting, it is intended for use as a primary component in complex brazing pastes or welding fluxes where it serves the functional role of preventing oxidation and promoting fluid flow of the filler metal.
    • Q:

      Is your product suitable for use in cosmetic or food applications?

      A: No. Our product is strictly manufactured and labeled as Industrial and Agricultural Grade. In compliance with international chemical regulations (such as EU REACH), borates are restricted from being used in consumer cosmetics and food additives. It is intended for technical use, metallurgy, ceramics, and agricultural soil amendment only.
    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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