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 550,00
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.
Frequently Asked Questions
+What is the crosslinking mechanism for one-part RTV systems using MESIL 107?
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.
+Is the MESIL® 107 series a direct equivalent to industry standards?
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.
+How do I select between low and high viscosity grades?
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.