OH Terminated PDMS 80000 cst CAS 70131-67-8 for Architectural Structural Sealan
OH Terminated PDMS 80000 cst is hydroxyl‑terminated polydimethylsiloxane, CAS 70131‑67‑8. This high‑viscosity 107 silicone polymer is specially developed for architectural structural sealant. It shows great miscibility with high‑performance reinforcing fillers and neutral alkoxy cross‑linkers. After condensation curing, finished sealant obtains high tensile strength, reliable substrate adhesion and outstanding anti‑ageing performance, widely used for curtain wall structural glazing and heavy‑dut
Product Overview
OH Terminated PDMS 80000 cst is hydroxyl‑terminated polydimethylsiloxane base polymer, CAS 70131‑67‑8. Designed for high‑performance architectural structural sealant, this 80000 cst high viscosity condensation‑cure PDMS owns precisely controlled hydroxyl content and stable viscosity index. When compounded with reinforcing mineral fillers and neutral silane cross‑linkers, it endows cured sealant with high cohesive strength and high‑modulus mechanical property. Strict batch inspection guarantees consistent quality for large‑scale construction sealant manufacturing.
Key Features
- 80000 cst high viscosity customized for architectural structural sealant
- Precisely controlled hydroxyl terminal groups for stable condensation cross‑linking
- Superior wetting and dispersing performance for reinforcing fillers
- Cured sealant achieves high modulus, high tensile and cohesive strength
- Reliable adhesion on glass, aluminium and other building substrates
- Excellent UV stability and long‑term outdoor weathering resistance
- Low volatile impurities, good batch‑to‑batch repeatability
- Compatible with neutral alkoxy and oxime cross‑linking systems
Main Applications
- Curtain wall architectural structural glazing sealant
- High‑modulus neutral structural bonding silicone sealant
- Heavy‑load building joint sealing compound
- Construction‑grade high‑strength condensation‑cure silicone compound
- Glass‑metal assembly structural sealing products
- Custom high‑performance structural silicone formulations
Processing Suggestions
Carry out feeding, kneading and dispersion under strictly moisture‑isolated workshop environment. Formulate with reinforcing fillers, neutral cross‑linking agent and organometallic catalyst. Adjust filler loading and additive ratio according to target modulus, tensile strength and adhesion requirements. Prevent moisture ingress throughout the whole production workflow to avoid premature curing defects.
Storage & Packing
Packed in sealed 200kg iron drum. Store in cool, dry and ventilated warehouse. Keep drum tightly sealed. Protect product from moisture, high temperature and direct sunlight. Reseal drum immediately after partial material discharge. Follow recommended storage conditions to preserve polymer reactivity and valid shelf‑life.
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