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Silane USi-A103 – Methyltriacetoxysilane (MTAS)
Fast-Curing Acetoxysilane Crosslinker for RTV Silicone Sealants
CAS No.: 4253-34-3
EINECS No.: 224-221-9
Molecular Weight: 220.25 g/mol
Chemical Name:
Methyltriacetoxysilane
Synonyms:
Methylsilanetriyl triacetate, MTASSilane USi-A103 is a high-efficiency acetoxysilane crosslinker widely used in one-component RTV (room-temperature vulcanizing) silicone sealants and adhesives. It enables rapid moisture-cured crosslinking at just 3–5% loading, delivering excellent adhesion, cure speed, and storage stability. Upon curing, it becomes fully integrated into the silicone rubber matrix—minimizing residual monomer and reducing exposure risk.
🧪 Product Description
Chemical Structure:
CH₃–Si(OCOCH₃)₃USi-A103 is engineered for performance in consumer and industrial sealant systems:
- The three acetoxy (–OCOCH₃) groups hydrolyze rapidly in the presence of atmospheric moisture, releasing acetic acid and forming Si–O–Si networks with base polymers (e.g., hydroxyl-terminated PDMS)
- The methyl group provides compatibility with standard silicone backbones while maintaining flexibility
- Acts as the primary or co-crosslinker to fine-tune:
- Cure rate (surface and through-cure)
- Adhesion to non-porous substrates (glass, metals, plastics)
- Shore hardness and elastic recovery
✅ Key Advantage: The industry-preferred fast-cure acetoxysilane for cost-effective, high-performance RTV-1 silicone formulations—trusted by sealant manufacturers worldwide.
📊 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 transparent liquid Specific Gravity (20°C) 1.16 – 1.17 g/cm³ Refractive Index (nD25) 1.4045 – 1.4055 Purity (GC, %) ≥ 90.0%
🏭 Key Applications
🔹 RTV-1 Silicone Sealants & Adhesives
- Primary crosslinker in acetoxy-cure silicone sealants for:
- Construction (glazing, sanitary, general-purpose sealing)
- Automotive (gasketing, trim bonding)
- Consumer DIY products
- Enables tool-free application, fast skin formation, and deep-section cure
🔹 Formulation Flexibility
- Can be used alone or blended with other acetoxysilanes (e.g., vinyltriacetoxysilane) to balance:
- Cure speed vs. shelf life
- Adhesion vs. shrinkage
- Hardness vs. elasticity
🔹 Low Residual Monomer Profile
- After curing, USi-A103 is chemically bound into the elastomeric network—no free monomer remains, significantly reducing potential exposure for end-users and workers
🔹 Industrial & OEM Supply
- Supplied as a parent silane to formulators who compound it into finished sealant products under controlled conditions
⚠️ Safety & Storage
- Corrosive: Releases acetic acid during cure—ensure adequate ventilation
- Store in original unopened containers at or below 35°C
- Keep away from heat and open flame
- Shelf Life: 12 months from production date under recommended conditions
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📦 Packaging
Available in industrial-grade, moisture-barrier containers:
- 25 L pail
- 200 L drum
- 1000 L IBC tote
All packaging is designed to prevent moisture ingress and maintain reactivity.
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Your Global Supplier of 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 - Website: www.usi-chemical.com
- Email: inquiry@usichemical.com
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