Shanghai Semitech New Material Co., Ltd.
1628 Lijing Road, Lingang New Area, 200000, Shanghai, China.
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Email:
info@semitechnm.com
MESIL® 107 Series: Silanol Terminated Polydimethylsiloxane (OH Polymer)
Bottom Line Up Front: The MESIL® 107 Series consists of high-purity silanol functional fluids (CAS 70131-67-8). Engineered primarily as the base polymer for condensation cure one-part and two-part RTV systems, these polymers are available in viscosities ranging from 750 to 550,000 mm²/s. Low viscosity grades function as reactive diluents and filler treatments, while high viscosity grades form the structural matrix for industrial adhesives and insulating glass sealants.
Technical Parameter Matrix
Physical properties of MESIL® OH Polymer. All grades share a standard Refractive Index (25°C) of 1.401-1.403 and a Colorless clear liquid appearance.
| Kinematic Viscosity (mm²/s) | Density (25℃, g/cm³) | Volatile (3h/150℃, %) | Primary Application Focus |
|---|---|---|---|
| 750 | 0.98 | < 1.5 | Reactive diluent / Filler treatment |
| 1,000 | 0.98 | < 1.5 | Structure control / Textile softener |
| 2,000 | 0.98 | < 1.5 | Textile durable fabric softener |
| 5,000 | 0.98 | < 1.5 | Textile durable fabric softener |
| 10,000 | 0.98 | < 1.5 | Textile softener / Base polymer |
| 20,000 | 0.98 | < 1.5 | RTV sealant base polymer |
| 50,000 | 0.98 | < 1.5 | RTV sealant base polymer |
| 80,000 | 0.98 | < 1.5 | High-performance RTV systems |
| 300,000 | 0.98 | < 2.0 | Tackifiers / Insulating glass sealants |
| 500,000 | 0.98 | < 2.0 | Pressure sensitive adhesives (PSA) |
| 550,000 | 0.98 | < 2.0 | Pressure sensitive adhesives (PSA) matrix |
Industrial Application Scenarios
Targeted solutions based on molecular weight and silanol functionality:
- RTV Adhesives & Sealants
- Formulates condensation cure one-part and two-part RTV systems. Polymers with molecular weights ranging from 15,000 to 150,000 are compounded with fillers to produce high-strength silicone sealants for insulating glass, construction, and household industries.
- Rubber Compounding & Filler Treatment
- Low viscosity silanol fluids (750 - 1000 cSt) act as critical anti-structuring additives and reactive diluents. They effectively treat filler surfaces, preventing the crepe hardening of silicone rubber during storage.
- Textile Finishing
- Intermediate viscosity grades (1,000 - 10,000 cSt) are emulsified and applied to textiles. The terminal silanol groups react to form a highly durable, wash-resistant fabric softening network.
Global Packaging & Logistics Constraints
- Standard Packaging Formats
- Delivered in 190 KG Drums, 200 KG Drums, and high-capacity 950 KG IBC Drums.
- Container Loading Capacity (20' GP)
- Maximum efficiency configurations: 80 standard drums (15.2 to 16 MT) OR 20 IBC drums (19 MT) per 20-foot General Purpose container.
Engineering FAQs (System Loop)
- Q: What is the crosslinking mechanism for one-part RTV systems using MESIL 107?
- A: One-part systems crosslink via a two-stage condensation reaction. Initially, the silanol terminated polymer is compounded with fillers and reacted with an excess of moisture-sensitive multi-functional silanes. The silane displaces the silanol, creating a moisture-curable matrix.
- Q: Is the MESIL® 107 series a direct equivalent to industry standards?
- A: Yes. Specific viscosity grades within the MESIL® 107 series serve as direct drop-in equivalents for Xiameter OHX-4081 and other standard hydroxy terminated polydimethylsiloxanes in sealant formulations.
- Q: How do I select between low and high viscosity grades?
- A: Use low viscosities (750-1000 mm²/s) strictly as reactive diluents to adjust overall formulation viscosity or to treat fillers. Use intermediate viscosities (1,000-10,000) for textiles. Mandate high viscosities (20,000-550,000) as the primary base matrix for sealants, tackifiers, and pressure-sensitive adhesives.