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High-performance, one-component, room-temperature vulcanizing (RTV) silicone adhesive sealant with excellent adhesion to glass, metals, and many plastics.
Low modulus formulation provides superior flexibility and stress relief in dynamic or thermally cycling joints.
Excellent resistance to UV radiation, ozone, moisture, and extreme temperatures (–55 °C to +180 °C continuous).
Non-corrosive, acetoxy-cure chemistry with rapid surface cure and consistent deep-section cure under ambient humidity.
Meets UL 94 HB flammability rating and supports compliance with RoHS and REACH requirements.
Sealing and bonding of architectural glazing systems, including insulating glass (IG) units and curtain wall assemblies.
Electronics encapsulation and potting for power supplies, LED lighting modules, and control panels requiring thermal stability.
Automotive sensor housing assembly and under-hood gasketing where vibration damping and long-term durability are critical.
Industrial equipment sealing for HVAC housings, solar panel frame bonding, and medical device enclosures.
General-purpose industrial maintenance and repair (MRO) applications demanding high reliability and low outgassing.
| Chemical Type | Acetoxy-cure, condensation-curing silicone polymer |
| Product Form | Thixotropic paste, single-component, ready-to-use |
| Appearance | Opaque white or translucent gray (color may vary by batch) |
| Shore A Hardness (7 days, 23 °C/50% RH) | 25–35 |
| Tensile Strength (ASTM D412) | ≥1.2 MPa |
| Elongation at Break (ASTM D412) | ≥250% |
| Primary Applications | Structural glazing, electronics encapsulation, industrial sealing |
| Regulatory Compliance | RoHS 2015/863 compliant; REACH SVHC-free; UL 94 HB rated |
| Common Compatible Systems | Suitability |
| Glass substrates (float, tempered, laminated) | Highly Recommended – Forms strong, durable bonds without primers |
| Anodized aluminum and stainless steel | Highly Recommended – Excellent adhesion with no corrosion risk |
| Poly(methyl methacrylate) (PMMA) and polycarbonate | Recommended – Requires surface cleaning; optional primer for critical loads |
| EPDM and silicone rubbers | Suitable – Good compatibility; verify for long-term immersion applications |
Q1: What is the CAS Registry Number for DOWSIL 744?
A: The CAS Number for DOWSIL 744 RTV Adhesive Sealant is 68953-58-2 (for the base polymer system); full formulation details are proprietary and available upon request via Dow’s regulatory documentation portal.
Q2: What is the recommended bead size and application temperature range?
A: Optimal application occurs between 10 °C and 35 °C with relative humidity ≥40%. Bead width should be ≥6 mm for structural glazing; minimum joint depth is 6 mm. Cure speed decreases significantly below 10 °C or 30% RH.
Q3: How does DOWSIL 744 compare to DOWSIL 995 or SE 9187 in terms of performance?
A: Unlike neutral-cure products (e.g., DOWSIL 995), DOWSIL 744 uses acetoxy cure—offering faster tack-free time and stronger initial adhesion to glass/metal, but not recommended for copper, brass, or alkaline surfaces. It has lower modulus than SE 9187, making it better suited for high-flexibility, low-stress applications.
Q4: Is DOWSIL 744 suitable for food-contact or pharmaceutical environments?
A: No—DOWSIL 744 is not FDA-compliant or certified to EU 10/2011 for food contact. It is not intended for direct or indirect food, beverage, or injectable pharmaceutical use. For such applications, consult Dow’s medical-grade silicone portfolio (e.g., DOWSIL™ Q2-7437).
Q5: Are there known extractables or leachables data for DOWSIL 744 in humid or elevated-temperature conditions?
A: Yes—Dow provides extractables profiles per USP <788> and ISO 10993-12 testing protocols. Acetic acid evolution is transient (<24 h post-application under standard conditions) and well below thresholds of concern. Full analytical reports are available under NDA to qualified customers.
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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
