Dowsil 744 Circuit Board Component Bonding RTV Adhesive Sealant
Basic Properties
Dowsil™ 744 is a one-part, white, non-flowing RTV adhesive sealant designed for general-purpose bonding. With high elongation (590%) for stress relief, it cures at room temperature without mixing or ovens, and supports heat acceleration for faster production.
Product Description
Curing via ambient moisture (30–80% RH), it achieves >90% physical properties in 24–72 hours. With a 10-minute skin-over time (25°C/50% RH) and workable time of 10–120 minutes, it cures inward at 0.25 inch/7 days. Silicone chemistry ensures stability across -45°C to 200°C with dielectric strength (15 kV/mm), ideal for electronics requiring long-term reliability.
Characteristics
Beyond elongation, its tensile strength (2.7 MPa), tear resistance (20 N/cm), and low modulus (0.5 MPa) enable flexible bonding with minimal substrate stress. Shore A hardness 37 balances flexibility/support, while volume resistivity (5×10¹³ Ω·cm) ensures insulation. Adhesion to aluminum reaches 430 psi (substrate testing required), with 12-month shelf life (25°C).
| Property |
Unit |
Result |
| Physical Properties |
|
|
| Extrusion Rate |
g/min |
184 |
| Viscosity (1/s) |
Pa·s |
753 |
| Viscosity (10/s) |
Pa·s |
135 |
| Slump |
cm |
0.6 |
| Tensile Strength |
MPa |
2.7 |
| Elongation |
% |
590 |
| Tensile Modulus |
MPa |
0.5 |
| Tear Strength (Die B) |
N/cm |
20 |
| Adhesion |
|
|
| Lap Shear to Aluminum |
MPa |
3 |
| Electrical |
|
|
| Dielectric Strength |
kV/mm |
15 |
| Volume Resistivity |
Ω·cm |
5E+13 |
| Curing |
|
|
| Skin-Over Time (25°C/50% RH) |
minutes |
10 |
| Tack-Free Time (25°C) |
minutes |
55 |
| Others |
|
|
| Specific Gravity (Cured) |
- |
1.42 |
| Shore A Hardness |
- |
37 |
| Shelf Life (25°C) |
months |
12 |
| UL Flammability |
- |
94-HB |
Scenario application
Designed for automated/manual dispensing, it bonds large components (e.g., batteries, capacitors) to PCBs. Industry cases include capacitor fixation in EV battery modules, heatsink bonding in industrial power supplies, and shock-resistant encapsulation of HV capacitors in telecom equipment.
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Dowsil 744 RTV Adhesive Sealant for Circuit Board Component Bonding Images
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