Fragrance avoidance
Nothing to weigh for this context yet.
We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.
- beauty
- industrial
3-Mercaptopropyltrimethoxysilane
CAS 29295-80-5
Also registered as 7 other CAS numbers
53241-23-9 · 56938-96-6 · 89468-78-0 · 161756-15-6 · 383189-28-4 · 1818863-79-4 · 4420-74-0
Concern score
Not assessed — no hazard data yet.
3-Mercaptopropyltrimethoxysilane in plain language
On cosmetic ingredient lists it appears as “Mercaptopropyltrimethoxysilane”.
Also known as Mercaptopropyltrimethoxysilane · (3-MERCAPTOPROPYL)TRIMETHOXYSILANE · 3-(Trimethoxysilyl)propane-1-thiol · 3-MPTMS · 3-trimethoxysilylpropane-1-thiol · (3-MERCAPTOPROPYL)-TRIMETHOXY-SILAN
Show all 28 names
(3-Thiopropyl)trimethoxysilane · (gamma-mercaptopropyl)trimethoxysilane · (γ-Mercaptopropyl)trimethoxysilane · 1-Propanethiol, 3-(trimethoxysilyl)- · 3-(Sulfanylpropyl)trimethoxysilane · 3-(TRIMETHOXYSILYL)PROPYL mercaptan · 3-(Trimethoxysilyl)-1-propanethiol · 3-(trimethoxysilyl)propanethiol · 3-MERCAPTOPROPYL trimethoxylsilane · A 189 (silicone) · Az 6129 · Gf 70 · Kbe 803 · Kbm 803 · M 8500 (coupling agent) · Nuca 189 · Prosil 196 · Silane A 189 · Silquest A 189 · Tsl 8380 · TSL8380E · organosilane
Used in cosmetics as a nail conditioning agent.
- Nail conditioning
- Antioxidant
- Conditioner
- We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.
Regulation
No restrictions found. 3-Mercaptopropyltrimethoxysilane appears in these published regulatory listings.
- Found in consumer products
- Industrial
EUCosIngActiveMercaptopropyltrimethoxysilane is the organic compound
- Mercaptopropyltrimethoxysilane is the organic compoundSource →
USEPAcommercial use observedEPA CPDat observed this chemical in 18 composition records across product categories including Raw materials, Home maintenance, Industrial products. EPA CPDat classifies this chemical for functional uses including Softener and conditioner, Antioxidant, Filler.
- EPA CPDat observed this chemical in 18 composition records across product categories including Raw materials, Home maintenance, Industrial products. EPA CPDat classifies this chemical for functional uses including Softener and conditioner, Antioxidant, Filler.Source →
USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
- openFDA substance registry classifies this ingredient as chemical.Source →
Expert safety opinions
No expert opinion on file for 3-Mercaptopropyltrimethoxysilane. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.
SCCS
EU Scientific Committee on Consumer Safety
No SCCS opinion on file.
CIR
Cosmetic Ingredient Review (US expert panel)
No CIR safety assessment on file.
Evidence & sources
No graded research studies for 3-Mercaptopropyltrimethoxysilane yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.
Where this comes from
- Open →
CosIng
regulatory · updated 2026-09-23
- Open →
EPA Chemical and Products Database
exposure · updated 2021-06-08
- Open →
EPA DSSTox Identifiers
chemistry · updated 2025-12-29
- Open →
FDA GSRS UNII
registry · updated 2026-02-26
- Open →
openFDA Substance
registry · updated 2026-05-24
- Open →
PubChem Live Enrichment
chemistry · updated 2026-05-17
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
No signal in this context
Where it has been recorded
How often EPA CPDat has listed 3-Mercaptopropyltrimethoxysilane in a product composition. These are source records, not Greenveil catalog products.
Source records
18
Named organisations
6
Raw materialsHome maintenanceIndustrial products
Typical roles
Nail conditioningAntioxidantConditioner