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Silane USi-A203 – Triacetoxyethylsilane (Ethyltriacetoxysilane, ETAS)
High-Reactivity Acetoxysilane Crosslinker for Acid-Cure Silicone Sealants
CAS No.: 17689-77-9
EINECS No.: 241-677-4
Molecular Weight: 234.3 g/mol
Chemical Name:
Triacetoxyethylsilane
Synonyms:
Ethyltriacetoxysilane, ETAS, ETASilane USi-A203 is a fast-reacting acetoxysilane crosslinker specifically engineered for one-component RTV silicone rubber and acidic-cure construction sealants. With ≥96% purity, it enables rapid moisture-driven vulcanization, excellent adhesion to glass and metals, and reliable performance in high-humidity environments—making it ideal for glazing, sanitary, and industrial sealing applications.
🧪 Product Description
Chemical Structure:
C₂H₅–Si(OCOCH₃)₃USi-A203 leverages the reactivity of three acetoxy groups combined with an ethyl backbone:
- Upon exposure to atmospheric moisture, it hydrolyzes rapidly, releasing acetic acid and forming reactive silanol intermediates
- These silanols condense with hydroxyl-terminated silicone polymers (e.g., PDMS) to build a 3D siloxane network
- The ethyl group offers slightly higher hydrophobicity and flexibility compared to methyl analogs, fine-tuning elastomer properties
- Particularly effective in acidic silicone glass sealants, where it ensures strong, durable bonds to non-porous substrates
✅ Key Advantage: A high-purity, fast-cure acetoxysilane that delivers superior adhesion and processing reliability in demanding RTV-1 silicone formulations.
📊 Typical Technical Data
The following values are typical and not intended for specification. Please confirm with our technical team before finalizing product requirements.
Parameter Specification Appearance Colorless to yellowish clear liquid Melting Point 7 – 9 °C Boiling Point (4 mmHg) 97 – 99 °C Flash Point 106 °C pH Value 5 – 6 Density (25°C) 1.16 – 1.17 g/mL Refractive Index (25°C) 1.4026 ± 0.0020 Purity (GC, %) ≥ 96.0%
🏭 Key Applications
🔹 RTV Silicone Rubber & Sealants
- Primary or co-crosslinker in acetoxy-cure RTV-1 silicones
- Enables fast surface cure and deep-section vulcanization even under high humidity
- Widely used in construction sealants for windows, bathrooms, and kitchens
🔹 Acidic Silicone Glass Sealants
- Preferred crosslinker for glass bonding applications due to its excellent adhesion profile and compatibility with standard silicone base polymers
- Forms durable, flexible seals resistant to weathering and thermal cycling
🔹 Industrial & OEM Formulations
- Supplied as a key intermediate to sealant manufacturers who compound it into finished products under controlled conditions
- After curing, fully integrated into the silicone matrix—no free monomer remains, minimizing exposure risk
⚠️ Safety & Storage
- Corrosive: Releases acetic acid during cure—use in well-ventilated areas
- Store in tightly sealed containers in a cool, dry place, away from light
- Keep away from heat and open flame
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📦 Packaging
Available in moisture-resistant industrial containers:
- 25 L drum (net weight: 25 kg)
- 200 L IBC (net weight: 200 kg)
All packaging is designed to prevent moisture ingress and preserve crosslinking efficiency.
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Your Trusted Source for High-Purity Acetoxysilane Crosslinkers- Headquarters:
Room 2002, Overseas Chinese Plaza, No.1 Daqiao North Road, Nanjing 210031, Jiangsu, P.R. China - Factory Address:
Dongcheng Guanli District, Gaizhou 115200, Liaoning, P.R. China - Tel: +86-25-5889 5266 / 5889 5699
- Fax: +86-25-5830 5349
- Website: www.usi-chemical.com
- Email: inquiry@usichemical.com
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