ALGIN- ▸ Textile print thickening: Thickens reactive-dye print pastes.
- ▸ Gelling agent: Forms gels in the presence of calcium ions.
- ▸ Food stabilizer: Thickens and stabilizes food formulations.
- ▸ Film forming: Produces water-based films and coatings.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Sodium alginate (CAS 9005-38-3) is the sodium salt of alginic acid, a polysaccharide extracted from brown seaweed. It functions as a thickening, gelling, and film-forming agent, and is widely used as a print-paste thickener in textile reactive dyeing and as a stabilizer in food systems.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU): Not determined from public registry
- EC number: 618-415-6
TSCA Inventory flag XU: a substance exempt from reporting under the Chemical Data Reporting Rule (40 CFR 711) (EPA flag legend).
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
Frequently Asked Questions
What is sodium alginate used for?
Sodium alginate (CAS 9005-38-3) is used as a thickening, gelling, and film-forming agent. Common uses include print-paste thickener in textile reactive dyeing, a calcium-set gelling agent, a food thickener and stabilizer, and the production of water-based films and coatings.
What is sodium alginate made from?
It is the sodium salt of alginic acid, a polysaccharide extracted from brown seaweed. RawSource supplies it as a refined raw material for textile, food, and industrial use.
Is sodium alginate water soluble?
Yes. Sodium alginate is water soluble and hydrates to form viscous solutions, which is the basis of its thickening and print-paste function. In the presence of calcium ions it crosslinks to form gels.
How does sodium alginate gel?
It forms gels by ionic crosslinking when calcium (or other multivalent) ions bridge the polymer chains, converting a viscous solution into a gel network. This calcium-set behavior is exploited in gelling, encapsulation, and film applications.
How is sodium alginate graded and quoted in bulk?
Grades differ chiefly in viscosity, which drives thickening and gel performance, and identity is confirmed at CAS 9005-38-3 under HS 3913.10. RawSource quotes by volume and grade; request a bulk quote specifying viscosity grade and quantity. A CoA and SDS are provided.
What is the REACH and TSCA regulatory status of Sodium Alginate (Algin)?
Sodium Alginate (Algin) (CAS 9005-38-3) is listed as Active on the U.S. EPA TSCA Inventory; its REACH registration status is not determined from the public ECHA registry.