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Acetoxy-cured silicone elastomer offering rapid room-temperature vulcanization (RTV) with low odor and minimal by-product evolution.
Semi-flowable rheology enables easy dispensing, gap-filling, and conformal coverage without sagging or slumping.
Excellent adhesion to common substrates including glass, aluminum, painted metals, and many plastics—without primer.
Outstanding resistance to UV radiation, ozone, and weathering for long-term outdoor performance.
Compliant with EU REACH and RoHS directives; formulated without intentionally added SVHCs or restricted phthalates.
Sealing and bonding of architectural glazing systems in curtain walls and façade assemblies.
Edge sealing and potting of LED lighting modules requiring thermal stability and optical clarity retention.
Gasketing and vibration-damping in automotive interior trim and electronic control units.
Encapsulation of sensors and power electronics exposed to variable temperature and humidity cycles.
Assembly bonding of solar panel frame components and junction box interfaces.
| Chemical Type | Acetoxy-cured polydimethylsiloxane (PDMS) elastomer |
| Product Form | Semi-flowable paste, single-component |
| Appearance | Opaque off-white to light beige paste |
| Primary Applications | Structural sealing, bonding, gasketing, and encapsulation |
| Key Features | RTV cure, primerless adhesion, UV/ozone resistance, EU regulatory compliance |
| Shelf Life | 12 months unopened at ≤25 °C in original sealed packaging |
| Vulcanization Speed | Surface tack-free in ~15–30 minutes; full cure depth ~3 mm/day at 23 °C/50% RH |
| Storage Conditions | Store in cool, dry place; avoid freezing and direct sunlight |
Q1: What is the primary function of DOWSIL Q3-3559 Plus EU in silicone elastomer formulations?
A: It serves as a semiflowable acetoxy-functional silicone elastomer designed to enhance elasticity, improve green strength during processing, and support controlled crosslinking in room-temperature vulcanizing (RTV) systems—particularly where improved sag resistance and moderate flow are required.
Q2: Is DOWSIL Q3-3559 Plus EU suitable for food-contact or medical-grade applications?
A: This grade is formulated for compliance with relevant EU regulatory expectations for indirect food contact when used in accordance with intended conditions and final formulation requirements; however, end-use suitability must be verified by the formulator through full system testing and regulatory assessment.
Q3: How does the “semiflowable” nature of this product affect processing behavior?
A: Its semiflowable consistency enables easier incorporation into high-viscosity silicone bases compared to solid elastomers, while still providing structural integrity to uncured compounds—supporting applications such as extrusion, dispensing, and mold filling without excessive slump or phase separation.
Q4: Can DOWSIL Q3-3559 Plus EU be used in combination with other silicone polymers or fillers?
A: Yes—it is compatible with common silicone fluids, gums, and reinforcing fillers (e.g., fumed silica), and is typically used at low concentrations to modify rheology and mechanical performance without compromising cure kinetics in acetoxy-cure systems.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
