{
  "$schema": "https://foodadditiveindex.com/api/v1/schema.json",
  "id": "https://foodadditiveindex.com/additives/aluminum-sodium-sulfate",
  "slug": "aluminum-sodium-sulfate",
  "name": "Aluminum sodium sulfate",
  "identifiers": {
    "e_number": "E521",
    "ins_number": null,
    "cas_number": "10102-71-3",
    "inchikey": "GJPYYNMJTJNYTO-UHFFFAOYSA-J",
    "pubchem_cid": 24939
  },
  "functional_class": null,
  "summary": "Aluminium sodium sulfate is a firming agent and a raising-agent component in some baking powders.",
  "derivation_summary": "Crystallised from aluminium sulfate and sodium sulfate together.",
  "regulatory_status": [
    {
      "jurisdiction": "US",
      "jurisdiction_name": "United States",
      "authority": "Food and Drug Administration",
      "status": "permitted",
      "status_label": "Permitted",
      "provision_count": 1,
      "provisions": [
        {
          "status": "permitted",
          "food_category": null,
          "max_level": null,
          "max_level_unit": null,
          "conditions": null,
          "effective_from": null,
          "citation": {
            "ref": "21 CFR 182.1131",
            "url": "https://www.ecfr.gov/current/title-21/section-182.1131"
          },
          "source": "ecfr",
          "retrieved_at": "2026-09-07T18:25:51.549Z"
        }
      ]
    },
    {
      "jurisdiction": "CODEX",
      "jurisdiction_name": "Codex Alimentarius",
      "authority": "Codex Alimentarius Commission / JECFA",
      "status": "not_listed",
      "status_label": "Not listed",
      "note": "Does not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.",
      "provision_count": 0,
      "provisions": []
    }
  ],
  "names": [
    {
      "name": "10102-71-3",
      "type": "cas",
      "source": "openfoodtox"
    },
    {
      "name": "ALUMINIUM SODIUM BIS(SULFATE)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Aluminium sodium bis(sulphate)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "ALUMINIUM SODIUM SULFATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "ALUMINIUM SODIUM SULFATE ANHYDROUS",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Aluminium sodium sulphate",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "aluminium(3+) ion sodium disulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Aluminum sodium disulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "ALUMINUM SODIUM SULFATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Aluminum sodium sulfate (AlNa(SO4)2)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "ALUMINUM SODIUM SULFATE ANHYDROUS",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Aluminum sodium sulfate, NaAl(SO4)2",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Aluminum sodium sulfic acid",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Aluminum sodium sulphate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "ALUMINUM SODIUM SULPHATE ANHYDROUS",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Aluminum sodium sulphic acid",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "E 521",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "EXSICCATED SODIUM SULFATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "HSDB 571",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "INS NO.521",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "INS-521",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "NATRII SULFAS EXSICCATUS",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Soda alum",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sodium alum",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "SODIUM ALUM ANHYDROUS",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sodium aluminium sulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sodium aluminum sulfate",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sodium aluminum sulfate (NaAl(SO4)2)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "SODIUM ALUMINUM SULPHATE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "SULFURIC ACID, ALUMINIUM SODIUM SALT (2:1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Sulfuric acid, aluminum sodium salt (2:1:1)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "XUANMINGFEN",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "E521",
      "type": "e_number",
      "source": "openfoodtox"
    },
    {
      "name": "aluminum sodium disulfate",
      "type": "iupac",
      "source": "openfoodtox"
    },
    {
      "name": "Aluminum sodium sulfate",
      "type": "label",
      "source": "ecfr"
    }
  ],
  "hazard_reference_values": [],
  "sources": [
    {
      "key": "ecfr",
      "name": "Electronic Code of Federal Regulations, Title 21",
      "publisher": "U.S. Government Publishing Office / National Archives",
      "licence": "Public domain",
      "url": "https://www.ecfr.gov/api/versioner/v1/full/2026-08-31/title-21.xml",
      "retrieved_at": "2026-09-07T18:25:51.549Z"
    }
  ],
  "citation_policy": "Cite as: Food Additive Index, \"Aluminum sodium sulfate\", https://foodadditiveindex.com/additives/aluminum-sodium-sulfate. This site reports regulatory status and does not rate additives.",
  "generated_at": "2026-09-08T00:09:38.405Z"
}