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    Related: Polysaccharide Thickener Xanthan Gum CMC
    • Sodium Alginate CAS 9005-38-3
    • Sodium Alginate CAS 9005-38-3

    Sodium Alginate CAS 9005-38-3

    Sodium Alginate (algin, E401), CAS 9005-38-3, is a seaweed-derived anionic polysaccharide supplied for food, pharmaceutical, textile and industrial applications. Confirm the required viscosity grade, then request a quotation with COA/TDS/SDS for bulk supply.

    • CAS: 9005-38-3
    • Synonyms: Algin, Alginic acid sodium salt, Sodium polymannuronate, Sodium alginate polymer, Alginate
    • Einecs: 618-415-6
    • Molecular Formula: (C₆H₇O₆Na)ₙ
    • Grade: Food grade / Industrial grade
    • Package: 25 kg paper-plastic composite bag with PE inner liner; jumbo bags or OEM packing on request
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    Product Description

    Sodium Alginate, CAS 9005-38-3, also known as algin or the sodium salt of alginic acid, is a natural anionic polysaccharide extracted from brown seaweed; the EC/EINECS number is 618-415-6.

    Synonyms: algin; alginic acid sodium salt; sodium polymannuronate; sodium alginate polymer; alginate.

    CAS: 9005-38-3.

    Representative molecular formula: (C₆H₇O₆Na)ₙ.

    Molecular weight: polymer, grade-dependent (viscosity grade).

    EC number: 618-415-6.

    It is a white to off-white, free-flowing, odorless powder that is soluble in water and forms a viscous colloidal solution; it is insoluble in ethanol, ether and chloroform.

    A 1% aqueous solution at 20 °C typically has a pH of 6.0–8.0; typical 1% viscosity grades range from 20–50 to 800–900 mPa·s and are customizable.

    The tapped bulk density is about 0.5–0.9 g/cm³, moisture (loss on drying) is ≤15.0% and ash is about 30–37%; it is most stable at pH 4–10 and precipitates below pH 3.

    It is used as a thickener, stabilizer, gelling agent and film former in food, pharmaceutical and personal-care formulations.

    It is used in textile printing paste, paper treatment and industrial binding, coating and controlled-release systems.

    It gels when divalent cations such as calcium replace sodium and bridge carboxyl groups; food-grade sodium alginate is listed as E401/INS 401.

    Confirm viscosity grade, gel strength, particle size, pH, moisture, ash and heavy metals; select food or industrial grade and specify the desired application.

    Store in tightly closed, moisture-protected containers in a cool, dry place away from strong oxidizers; use dust-control measures and suitable PPE.

    Confirm the current product-specific specification.

    Confirm packaging with the requested quantity and destination requirements.

    Document requirements should be confirmed from the current specification, SDS, COA or other product-specific files.

    The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

    For an RFQ, state the intended use, required specification, quantity, packaging, destination and document needs.

    FAQ - Technical & Supply Chain

    • Q:

      What is Sodium Alginate CAS 9005-38-3?

      A: Sodium Alginate is the sodium salt of alginic acid, a natural anionic polysaccharide extracted from brown seaweed. It is supplied as a water-soluble white to off-white powder and is used as a thickener, stabilizer, gelling agent and film former.
    • Q:

      Does CAS 9005-38-3 identify one viscosity grade?

      A: No. The CAS number identifies the sodium alginate polymer class rather than a single molecular weight or grade. Viscosity, gel strength, particle size and the desired application should be specified separately when selecting a product.
    • Q:

      What are the main applications of Sodium Alginate?

      A: It is used in food thickening, stabilization, encapsulation and spherification; in textile printing paste; in paper treatment; in pharmaceutical and dental impression materials; and in industrial binding, coating and controlled-release systems.
    • Q:

      How does Sodium Alginate form a gel?

      A: Sodium Alginate gels when divalent cations such as calcium replace sodium and bridge carboxyl groups on adjacent polymer chains. This ionic crosslinking is widely used to form beads, capsules, structured gels and molded or extruded products.
    • Q:

      Is Sodium Alginate used as a food additive?

      A: Yes. Food-grade sodium alginate is listed as E401 in the EU and INS 401 in the Codex system. It is used at low dosages in sauces, desserts, dairy products, restructured foods, beverages and molecular gastronomy.
    • Q:

      How should Sodium Alginate powder be stored and handled?

      A: Keep it in tightly closed, moisture-protected containers in a cool, dry place away from strong oxidizers. Use dust-control measures and appropriate PPE when weighing and transferring the powder.

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