Methoxy Terminated Polydimethylsiloxane
Methoxy Terminated Polydimethylsiloxane is formally named α,ω-dimethoxy terminated polydimethylsiloxane, also known as alkoxy-terminated 107 siloxane fluid. It features linear polydimethylsiloxane backbone with reactive dimethoxysilyl alkoxy functional groups bonded at both terminals。
Methoxy Terminated Polydimethylsiloxane
Methoxy Terminated Polydimethylsiloxane
Cas：68951-97-3
Chemical Structure: \(\mathrm{(CH_3O)_2Si(CH_3)-O-[Si(CH_3)_2O]_n-Si(CH_3)(OCH_3)_2}\)
Appearance: Colorless to pale yellow transparent viscous liquid with slight methanol odor
Methoxy Content: Adjustable from 0.02 to 0.2 mmol/g, varies with molecular weight
Density (25℃): 0.97–0.99 g/cm³
Refractive Index (20℃): 1.408–1.412
Flash Point: Above 130℃, low volatility
Volatile Content (150℃, 2h): ≤2.5%
Freezing Point: ＜-60℃, excellent low-temperature fluidity
Storage Requirements
Store in tightly sealed nitrogen-purged light-shielded containers at 2–25℃, fully isolated from moisture, rain and humid air.
Do not co-store with water, alcohols, organic acids, strong alkalis, organotin/titanate catalysts to prevent premature condensation gelation.
Keep packaging fully airtight against moisture and dust; standard shelf life is 12 months.
Separate from high-temperature heat sources and open flames, maintain dry and ventilated warehouse environment.
Viscosity (25℃)：5-12cSt
Custom specifications are available upon customer request
Base polymer for high-grade dealcoholized room-temperature vulcanized (RTV) silicone rubber: Raw material for transparent electronic sealant, lamp potting adhesive, kitchen & bathroom mildew-proof sealant, neutral weather-resistant anti-yellowing silicone sealant.
Synthetic intermediate for silicone-modified epoxy & polyurethane resins: Condensation graft with hydroxyl/carboxyl resins to improve coating smoothness, weather resistance and low internal stress.
Insulating sealing material for electronic components: Transparent potting compound for power supplies, PCBs and sensors with low precipitation and no substrate corrosion.
Raw material for optical transparent silicone gel: Encapsulation & bonding for LEDs and optical lenses, long-term high light transmittance without yellowing.
Compatibility modifying additive for coatings & inks: Enhance coating hydrophobicity and abrasion resistance without surface contamination from migrated small molecules.
Base polymer for architectural weather-resistant sealants and automotive accessory bonding adhesives.
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