Is 2-Methylbutane-2-Thiol safe in cosmetics?
2-Methylbutane-2-Thiol has a safety rating of "MODERATE" in our database. EU status: prohibited. US status: permitted.
MODERATE
Cosmetic Ingredient
2-Methylbutane-2-Thiol
Also known as: tert-Amyl mercaptan, EINECS 216-843-4, 2-Methybutane-2-thiol, 2-Methyl-2-butanethiol, NSC 60251 (+2 more)
INCI: 2-METHYLBUTANE-2-THIOL
2-Methylbutane-2-Thiol (CAS 1679-09-0) is a cosmetic cosmetic ingredient functioning as Fragrance ingredient. EU Regulation 1223/2009 status: prohibited. Industrial safety data is also available in the chemical safety database. Same-CAS public records also appear in industrial chemical safety data.
Cross-Vertical Regulatory Divergence
2-Methylbutane-2-Thiol is prohibited in EU cosmetics but has active industrial GHS classifications (H225, H302, H315, H317, H319, H335).
Source: Cosmetics: ingredients.eu status; Chemicals: ghs classifications.signal word/hazard statement code
Function
Fragrance ingredient
Editorial assessment
MODERATE
Preliminary editorial note — not a computed safety verdict.
Chemistry & Identifiers
IUPAC Name
2-methylbutane-2-thiol
InChIKey
IQIBYAHJXQVQGB-UHFFFAOYSA-N
Regulatory Status
EU EU Status
prohibited
US US Status
permitted
US Notes
Permitted — no specific FDA prohibition
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for 2-Methylbutane-2-Thiol.
Calculate MoS for your specific formulation with the MoS Calculator.
Function Categories & List Membership
Cosmetic/Chemical Function Categories
Flavouring and nutrient
Fragrance
Editorial summary
Preliminary editorial summary for 2-Methylbutane-2-Thiol — not a computed safety verdict. See the sourced toxicological data above.
Regulatory Flags
fragrance-component
Known Synonyms
tert-Amyl mercaptan
EINECS 216-843-4
2-Methybutane-2-thiol
2-Methyl-2-butanethiol
NSC 60251
tert-Pentyl mercaptan
2-tert-Pentyl mercaptan
Chemical Function
Fragrance
Flavouring and nutrient
Regulatory Lists
Europe
Australian Status
AICIS status: listed
Frequently Asked Questions
Is 2-Methylbutane-2-Thiol allowed in the EU?
2-Methylbutane-2-Thiol EU regulatory status: prohibited. This is based on EU Regulation 1223/2009 and its amendments.
What does 2-Methylbutane-2-Thiol do in cosmetics?
2-Methylbutane-2-Thiol functions as: Fragrance ingredient. It is classified as a cosmetic ingredient in our database. CAS number: 1679-09-0.
Is 2-Methylbutane-2-Thiol used outside cosmetics?
2-Methylbutane-2-Thiol also appears in industrial chemical safety data. The cross-vertical cards on this page render same-CAS public rows from the matched databases.
Does 2-Methylbutane-2-Thiol have different safety status in cosmetics vs industrial chemicals?
2-Methylbutane-2-Thiol is prohibited in EU cosmetics but has active industrial GHS classifications (H225, H302, H315, H317, H319, H335).
Compliance Tools
Check 2-Methylbutane-2-Thiol compliance across multiple jurisdictions:
Ingredient Decoder
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82 Allergen Checker
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Substance Compliance
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MoS Calculator
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Heavy Metal Limits
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