Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4]
Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4] is listed in Annex II as a prohibited substance for cosmetic products placed on the EU market.
Chemical identity and properties
Hydroxylamine, sulfate (1:1)
- IUPAC name
- hydroxylamine;sulfuric acid
- Molecular formula
- H5NO5S
- Molecular weight
- 131.11 g/mol
- Exact mass
- 130.98884343 Da
- Topological polar surface area
- 129.0 Ų
- Hydrogen-bond donors
- 4
- Hydrogen-bond acceptors
- 6
- Covalent units
- 2
- Defined stereocentres
- 0
Also known as
3 more reported names
External database identifiers
- EPA DTXSID:DTXSID9064928
Evidence from additional scientific databases
NIH PubChem PUG-View
Attributed physical-property, hazard, environmental and use annotations.
- Density: Relative density (water = 1): 1.9 Source: ILO-WHO International Chemical Safety Cards (ICSCs)
- Physical Description: WHITE-TO-BROWN HYGROSCOPIC CRYSTALS. Source: ILO-WHO International Chemical Safety Cards (ICSCs)
- Solubility: Solubility in water: good Source: ILO-WHO International Chemical Safety Cards (ICSCs)
- Exposure Routes: The substance can be absorbed into the body by inhalation of its aerosol. Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record
Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.
Additional source coverage and match status
| Source | Result | Checked |
|---|---|---|
| EMBL-EBI ChEBI | No exact record | 2026-08-31 |
| NIH PubChem PUG-View | Exact match | 2026-08-31 |
A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Hydroxylamine, phosphate (1:1)
- IUPAC name
- hydroxylamine;phosphoric acid
- Molecular formula
- H6NO5P
- Molecular weight
- 131.03 g/mol
- Exact mass
- 130.99835929 Da
- Topological polar surface area
- 124.0 Ų
- Hydrogen-bond donors
- 5
- Hydrogen-bond acceptors
- 6
- Covalent units
- 2
- Defined stereocentres
- 0
Also known as
3 more reported names
External database identifiers
- EPA DTXSID:DTXSID10885082
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Hydroxylamine, phosphate (3:1) (salt) (8CI,9CI)
- IUPAC name
- hydroxylamine;phosphoric acid
- Molecular formula
- H12N3O7P
- Molecular weight
- 197.09 g/mol
- Exact mass
- 197.04128673 Da
- Topological polar surface area
- 217.0 Ų
- Hydrogen-bond donors
- 9
- Hydrogen-bond acceptors
- 10
- Covalent units
- 4
- Defined stereocentres
- 0
Also known as
External database identifiers
- EPA DTXSID:DTXSID101367428
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Hydroxylammonium 4-methylbenzenesulphonate
- IUPAC name
- hydroxyazanium;4-methylbenzenesulfonate
- Molecular formula
- C7H11NO4S
- Molecular weight
- 205.23 g/mol
- Exact mass
- 205.04087901 Da
- Topological polar surface area
- 113.0 Ų
- Hydrogen-bond donors
- 2
- Hydrogen-bond acceptors
- 4
- Covalent units
- 2
- Defined stereocentres
- 0
Also known as
External database identifiers
- EPA DTXSID:DTXSID00202224
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Record details
Chemical name
Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4]
Chemical / IUPAC name
Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4]
Regulatory information
CMR
| Category | Carcinogenic | Mutagenic | Reprotoxic |
|---|---|---|---|
| Cat. 2 | ✓ | — | — |
Key data
Related records for Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4]
Direct matches are limited for this record, so nearby entries from Annex II are shown as well.
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What Annex II means for Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4]
Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4] is listed as a prohibited substance under Annex II of EU Cosmetics Regulation 1223/2009 and must not be intentionally added. Article 17 separately addresses unintended small quantities that are technically unavoidable under good manufacturing practice and compatible with the Article 3 safety requirement.
Formulators must screen their ingredients and raw materials to ensure none contain this substance. Suppliers should provide documentation confirming absence when requested.
The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.
Compliance checklist
- Verify this substance is absent from all raw materials and finished formulations.
- Request absence confirmation or CoA from raw material suppliers.
- Document the screening result in the Product Information File (PIF).
- This substance has CMR classification. Review the CMR table above and verify current Annex II/III status before use.
Frequently asked questions
Source note for Annex II record Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4]
This page summarizes one Annex II record for Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4] from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.
Use this record page to review Annex II conditions for Hydroxylammonium hydrogensulfate; hydroxylamine sulfate(1:1) [1]; Hydroxylamine phosphate [2]; Hydroxylamine dihydrogenphosphate [3]; Hydroxylamine 4-methylbenzenesulfonate [4], but confirm any final regulatory decision against the current official annex wording and source files.
Tools & next steps
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