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USi Waterproofing Agent No. 3
Poly(methyltriethoxysilane) – High-Performance Solvent-Based Silicone Water Repellent
Also known as: Silicone Waterproofing Agent #3, 3# Waterproofing Agent
📄 Product Description
- Chemical Name: Poly(methyltriethoxysilane)
- Type: Oligomeric organosilane (average degree of polymerization: 2–3)
- Form: Colorless transparent to light yellow liquid
- Odor: Characteristic mild fragrance
- Nature: Neutral, solvent-based, flammable
✅ Belongs to the premium series of organic silicone waterproofing agents with excellent film-forming and water-repellent properties.
(Molecular structure available upon request – representative of oligomeric methylsiloxane network)
📊 Typical Technical Data
⚠️ The following values are typical and provided for reference only. Not to be used for specification or quality acceptance without prior written confirmation from our technical team.
Parameter Specification Appearance Colorless transparent or light yellow liquid Viscosity (25°C) 1.0–5.0 mm²/s
(Grade A: 1.0–3.0; Grade B: 3.0–5.0)Ethanol Content ≤ 10% Specific Gravity (25°C) 0.920 – 1.050 g/cm³ pH (10% in ethanol/water) 5.0 – 6.0 Acid Value < 0.5 mg KOH/g
🌐 Key Properties
- Excellent water repellency with retained substrate breathability
- High thermal & UV resistance – ideal for long-term outdoor exposure
- Neutral pH – non-corrosive to stone, concrete, wood, and historic materials
- Forms durable siloxane network via hydrolysis & condensation under moisture, acid, or alkali conditions
- Enhances mechanical performance when used in RTV silicone formulations (vs. TEOS)
🏗️ Applications
USi Waterproofing Agent No. 3 is widely used in construction, conservation, and specialty coatings:
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Building Protection:
- Waterproofing of facades, roofs, basements, and insulation materials
- Anti-fouling and weathering protection for high-end architecture
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Cultural Heritage Conservation:
- Penetrating treatment for historical stone, brick, and mortar – preserves appearance while repelling water
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Specialty Formulations:
- Base for transparent resin coatings after controlled hydrolysis
- Additive in 107 silicone glue to improve flexibility and adhesion
- Fire-retardant treatment for gypsum decorative elements
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Industrial Uses:
- Intermediate for defoamers, release agents, and pressure-sensitive silicone isolators
- Crosslinker in methyl RTV silicone rubber – delivers superior tensile strength and elongation vs. tetraethyl orthosilicate (TEOS)
💡 Unique Advantage: Unlike film-forming sealers, it penetrates deeply and reacts within the substrate—preserving natural texture and vapor permeability.
📦 Packaging
- 50 kg drum
- 200 kg drum
(All containers are sealed, labeled, and suitable for safe transport of flammable liquids)
🛡️ Safety & Storage
- Flammable liquid – keep away from heat, sparks, and open flame
- Store in original, tightly closed containers at ≤ 25°C
- Shelf Life: 6 months from production date (for 200L drums under recommended conditions)
- Always consult the latest Safety Data Sheet (SDS) before handling
→ Available at: www.usi-chemical.com or upon request - Use appropriate PPE (gloves, goggles, ventilation) as indicated in SDS
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
- 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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