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Low-viscosity, flowable silicone formulation enabling excellent gap-filling and conformal coverage on complex geometries.
Room-temperature vulcanizing (RTV) chemistry with rapid tack-free time and full cure within 24–72 hours under ambient conditions.
Excellent adhesion to common substrates including metals, glass, ceramics, and many plastics—without primer.
Broad service temperature range from –55 °C to +200 °C, maintaining elastomeric integrity and sealing performance.
UL 94 HB rated for flame resistance and compliant with RoHS and REACH directives for industrial safety and sustainability.
Sealing and potting of electronic components such as sensors, connectors, and power modules.
Encapsulation of automotive lighting assemblies and under-hood electronics requiring thermal and vibration resistance.
Gap-filling and moisture protection in HVAC and appliance control units.
Conformal coating and edge-sealing of printed circuit boards (PCBs) in industrial automation systems.
Non-structural bonding and sealing in medical device housings where biocompatibility and low outgassing are critical.
| Chemical Type | Room-Temperature Vulcanizing (RTV) Silicone Elastomer |
| Product Form | Flowable liquid sealant, one-component |
| Appearance | Opaque white paste |
| Primary Applications | Sealing, potting, encapsulation, and conformal protection |
| Key Features | Low viscosity, primerless adhesion, fast surface cure, high elongation |
| Benefits | Reduced processing time, improved reliability, enhanced environmental resistance |
| Cure Mechanism | Moisture-curing (condensation type) |
| Storage Stability | 12 months unopened at 25 °C in original sealed container |
Q1: What is the primary function of DOWSIL 734 in sealing applications?
A: DOWSIL 734 is a flowable, addition-cure silicone elastomer designed to provide excellent conformal sealing and gap-filling capabilities for complex or irregular surfaces, particularly in electronic encapsulation, automotive sensor protection, and precision industrial assemblies.
Q2: How does DOWSIL 734 differ from conventional high-viscosity silicone sealants?
A: Unlike traditional paste-like or caulking-grade silicones, DOWSIL 734 exhibits low viscosity and controlled thixotropy, enabling smooth dispensing, self-leveling behavior, and minimal air entrapment—making it especially suitable for automated processes and fine-feature sealing where uniform coverage is critical.
Q3: Is DOWSIL 734 compatible with common substrates such as plastics, metals, and printed circuit boards?
A: Yes, DOWSIL 734 demonstrates good adhesion to a broad range of substrates—including aluminum, stainless steel, glass, epoxy-based PCBs, and many engineering thermoplastics—without requiring primers, though surface cleanliness and compatibility testing under end-use conditions are recommended.
Q4: What curing mechanism does DOWSIL 734 use, and how does it affect processing?
A: DOWSIL 734 cures via platinum-catalyzed addition reaction, offering predictable, inhibitor-controlled cure profiles with no by-products. This enables precise control over pot life and cure speed through temperature adjustment, supporting both room-temperature handling and accelerated thermal cure in production environments.
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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
