What is the NOAEL for Thorium(IV) oxide?
Thorium(IV) oxide has 8 NOAEL studies in the database. The lowest reported value is cancer listing type. Source: California Proposition 65.
NOAEL Data
Prop 65
Cosmetic Ingredient
Thorium(IV) oxide
Also known as: EINECS 215-225-1, Thorianite, Thorium anhydride, Thortrast, Thorium-232 dioxide (+3 more)
CAS 1314-20-1
Thorium(IV) oxide (CAS 1314-20-1) is a chemical substance; key hazard signal: cancer. Key regulatory status: California Proposition 65, 2 regulatory/inventory lists, cosmetic ingredient cross-reference; source data from EPA ToxValDB, EPA CPDat, AICIS, CA Prop 65, EPA TRI.
Cross-Vertical Regulatory Divergence
Thorium(IV) oxide is prohibited in EU cosmetics but has active industrial GHS classifications (H301, H311, H331, H350, H373).
SOURCE
Cross-vertical comparison
Cosmetics: ingredients.eu_status; Chemicals: ghs_classifications.signal_word/hazard_statement_code
SOURCE
noael studies public
NOAEL studies
8
SOURCE
chemical inventory jurisdictions
Regulatory lists
2
SOURCE
eu clp annex vi
GHS signal
Not classified
Chemical Identity
CAS, identifiers, formula, and alternate names for the matched substance record.
SOURCE
DSSTox identifiers
14 fields
Name
Thorium(IV) oxide
CAS Number
1314-20-1
DTXSID
DTXSID0051657
Molecular Formula
2O.Th
InChI Key
ZCUFMDLYAMJYST-UHFFFAOYSA-N
Monoisotopic Mass
264.027885
Synonyms
EINECS 215-225-1ThorianiteThorium anhydrideThortrastThorium-232 dioxideUNII-9XA7X17UQCThO2thoria
California Proposition 65
California OEHHA listing status and toxicity category.
SOURCE
California OEHHA Proposition 65 List
1 records
| Chemical | Toxicity Type | Cancer | Developmental | Listed |
|---|---|---|---|---|
| - | cancer | Yes | No | - |
Functional Uses
Industrial and product-use categories associated with this substance.
SOURCE
EPA CPDat
2 records
Softener and conditionerBinder
Regulatory Lists
Inventory, screening, and regulatory list matches from public chemical databases.
SOURCE
EPA CPDat
2 records
| List | Keyword | Source |
|---|---|---|
| OEHHA Proposition 65 (3/2019) | STATE OF CALIFORNIA ENVIRONMENTAL PROTECTION AGENCY | OEHHA Proposition 65 List |
| OEHHA Proposition 65 (1/2023) | California Office of Environmental Health Hazard Assessment | OEHHA Proposition 65 List |
NOAEL Studies
Toxicology endpoints rendered from public NOAEL study rows.
SOURCE
NOAEL studies
Showing 8 of 8 studies
| Value | Unit | Endpoint | Route | Species | Source |
|---|---|---|---|---|---|
| LCcancer | listing type | California Proposition 65 listing | - | - | California Proposition 65 |
| LCcancer | listing type | California Proposition 65 listing | - | - | California Proposition 65 |
| LCcancer | listing type | California Proposition 65 listing | - | - | California Proposition 65 |
| LCcancer | listing type | California Proposition 65 listing | - | - | California Proposition 65 |
| 9XA7X17UQC | UNII | FDA UNII substance identifier | - | - | openFDA substances |
| 9XA7X17UQC | UNII | FDA UNII substance identifier | - | - | openFDA substances |
| 9XA7X17UQC | UNII | FDA UNII substance identifier | - | - | openFDA substances |
| 9XA7X17UQC | UNII | FDA UNII substance identifier | - | - | openFDA substances |
Showing 8 of 8 studies
EPA Toxic Release Inventory (TRI)
TRI hazard and reporting flags for the matched chemical.
SOURCE
EPA Toxics Release Inventory (TRI) chemical list
1 records
| Chemical | Category | Flags |
|---|---|---|
| Thorium dioxide | - | - |
Australian Status (AICIS)
Australian industrial chemicals inventory status and applicable conditions.
SOURCE
AICIS inventory
1 records
Inventory Status
listed
Cosmetic Safety Profile
Same-CAS cosmetic ingredient record for cross-vertical context.
SOURCE
CosIng / Ingredients DB
EU Status
prohibited
Max
-
Category
Cosmetic Ingredient
Frequently Asked Questions
What regulatory lists include Thorium(IV) oxide?
Thorium(IV) oxide appears on 2 regulatory/inventory lists including OEHHA Proposition 65 (3/2019), OEHHA Proposition 65 (1/2023). Source: EPA CPDat.
Is Thorium(IV) oxide on the California Proposition 65 list?
Yes, Thorium(IV) oxide is listed under California Proposition 65 for cancer. Source: California OEHHA Proposition 65.
Is Thorium(IV) oxide used in cosmetics?
Yes, Thorium(IV) oxide is also indexed as a cosmetic ingredient under the name Thorium Dioxide. View the full cosmetic safety profile on the ingredient page for detailed safety data, SCCS opinions, and regulatory status.
Where does the safety data for Thorium(IV) oxide come from?
Safety data is sourced from EPA ToxValDB, EPA CPDat, AICIS (Australian Industrial Chemicals Introduction Scheme), EPA DSSTox, California Proposition 65, EPA Toxics Release Inventory, CosIng / Ingredients DB. All data traces to primary regulatory sources and is updated from official government databases.
Does Thorium(IV) oxide have different safety status in cosmetics vs industrial chemicals?
Thorium(IV) oxide is prohibited in EU cosmetics but has active industrial GHS classifications (H301, H311, H331, H350, H373).
Is Thorium(IV) oxide used outside industrial chemicals?
Thorium(IV) oxide also appears in cosmetics databases.