Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Characteristics
ThermoBond 3821 is a high thermally conductive adhesive. It is a non-slump, addition-curing, ready-to-use, two-component silicone that cures at room temperature or elevated temperature to a rubber with excellent thermal conductivity. With heat cure, the adhesive provides strong bonding strength to various substrates. The cured material provides stress compliance for thermal cycles. ThermoBond 3821 is both dispensable and printable.
- Special Features & Benefits
- High thermal conductivity
- Almost constant properties from –50 to 180 °C
- Low modulus for stress compliance
- Low bleeding, low volatile
- Strong adhesion to many substrates without using primer if cures at elevated temperature
Applications & Uses
- Applications
- Cure Method
- Typical Applications
- Bonding of electronic parts to dissipate heat
- Automotive electronics
- Semiconductor and Telecommunications
- Between high heat power device and heat sink
- Thermally conductive vibration dampening
- Couple thermal stress while dissipating heat
- Processing Instruction
- Important! ThermoBond 3821 is platinum cure system. Please keep applied surface clean and avoid using this material on any surface that contains sulfur, amine, phosphorous, organo-metals, acid, etc. because these containments could inhibit the cure of the material.
- For the package in a container (not in a cartridge), to ensure homogeneity of the material, it is suggested that the component be stirred thoroughly before it is removed or processed in order to uniformly disperse any fillers that might have settled during storage.
- We recommend running preliminary tests to optimize conditions for the particular application. Comprehensive processing instructions can be obtained by contacting directly to United Adhesives Inc.
Properties
- Color
- Typical Properties
- Typical Cured Properties
| Value | Units | Test Method / Conditions | |
| Density (As Mixed) | 2.8 | Gram /cc | ASTM D792 |
| Mixing Ratio | 1:1 | By vol. or wt. | ITM |
| Viscosity (As Mixed At 25°) | 160000.0 | cps | ASTM D2196 |
| Value | Units | Test Method / Conditions | |
| Adhesion (Al/Al Lap Shear) | min. 550 | psi | ASTM D3163 |
| CTE | 98.0 | ppm/°C | IPC-TM-650 |
| Cure Time (125°C) | 15.0 | Min | DSC |
| Cure Time (25°C) | 2 - 4 | Hours | DSC |
| Dielectric Constant (100 Hz) | 3.0 | - | ASTM D150 |
| Dielectric Strength | min. 450 | Voltmil AC | ASTM D149 |
| Dissipation Factor (100 Hz) | max. 0.01 | - | ASTM D150 |
| Elongation | 45.0 | % | ASTM D638 |
| Hardness | 90.0 | Shore A | ASTM D2240 |
| Pot Life (25°C) | 30.0 | Min | Viscosity double |
| Tensile Strength | 1:1 | MPa | ASTM D638 |
| Glass Transmission | -120.0 | °C | TGA |
| Thermal Conductivity | 2.0 | W/mK | ASTM D5470 |
| Useful Temperature Range | -55 to 200 | °C | TGA |
| Volume Resistivity | min. 10E+14 | Ohm-cm | ASTM D257 |
| Weight Loss In Cure. | max. 0.3% | Weight % | TGA |
Safety & Health
- Safety
Addition curing ThermoBond 3821 silicone adhesive contains neither toxic nor corrosive substances that might require special handling precautions. General hygiene regulations should be observed.
Storage & Handling
- Storage
ThermoBond 3821 has a shelf life of at least 6 months when stored below 21°C in the originally sealed container. The 'Best use before end' date of each batch appears on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.