MG Chemicals 834B - Black Flame Retardant Epoxy
- Chemical Family
- Epoxy & Epoxy Derivatives
834B potting and encapsulating compound is a black, flame retardant, thermally conductive two-part epoxy that offers extreme environmental, mechanical and physical protection for printed circuit boards and electronic assemblies. This product is designed for applications where thermal management and self-extinguishing are critical. It also provides excellent electrical insulation and protects components from static discharges, vibration, abrasion, thermal shock, environmental humidity, salt water, fungus, and many harsh chemicals. This epoxy has a convenient 2:1 volume mix ratio, making it compatible with most dispensing equipment. 834B can be cured at room temperature or higher.
Product families
- Encapsulants
Other characteristics
- Cure Method
- Air Dry
- Product Type
2K (2 component) Sealant, Epoxy Sealant, Potting Compound; 2K (2 component) Sealant; Epoxy Sealant; Potting Compound
- Compatible Substrates & Surfaces
- Ceramic, Composites, Glass, Metal, Plastics
- Markets
- Electrical & Electronics
- Shelf LIfe
- 5 Years
- Cure
- Air Dry
- Flame Rating
- UL 94 V0
- Technology
- Ready-to-Use Products
- Labeling Claims
- Solvent-free
- Cured Properties
Note: Specifications are for epoxy samples cured at 80 °C for 1 h and conditioned at ambient temperature and humidity. a) To allow comparison between products, the dielectric strength was recalculated with the Tautscher equation fitted to 5 experimental values and extrapolated to a standard thickness of 1/8" (3.175 mm). b) Coefficient of Thermal Expansion (CTE) units are in ppm/°C = in/in/°C × 10-6 = unit/unit/°C × 10-6.
- Uncured Properties
a) Brookfield viscometer at 30 rpm with spindle LV S64
- Benefits and Features
Meets UL 94V-0 standard—flame retardant; Convenient 2A:1B volume mix ratio; Thermal conductivity of ~0.8 W/(m·K); Low exotherm; Very high compressive and tensile strength; Excellent adhesion to a wide variety of substrates including metals, composites, glass, ceramics, and; many plastics; Excellent electrical insulating characteristics; Broad service temperature range of -40 to 175 °C (-40 to 347 °F); Contains non-halogenated flame-retardant fillers; Solvent-free
- Chemical Inventories
- AICS (Australia)
- DSL (Canada)
- EINECS (EU)
- IECSC (China)
- KECI (Korea)
- NCI (Vietnam)
- NZIoC (New Zealand)
- PICCS (Phillipines)
- Certifications and Compliance
- RoHS Compliant
- UL 94
Technical data
Table 1 of 6
11 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| Compressive Strength ⁽ᵃ⁾ | 74 (11,000) | mPa (psi) | ASTM D 695 |
| Density (at 25°C, 77°F) | 1.59 | g/mL | ASTM D 1475 |
| Flammability | Meets 94 V-0 | — | UL 94 |
| Hardness D | 85 | — | Shore D Durometer |
| Lap Shear Strength (ABS) ⁽ᵃ⁾ | 1.8 (260) | mPa (psi) | ASTM D 1002 |
| Lap Shear Strength (Aluminum) ⁽ᵃ⁾ | 11 (1600) | mPa (psi) | ASTM D 1002 |
| Lap Shear Strength (Brass) ⁽ᵃ⁾ | 17 (2500) | mPa (psi) | ASTM D 1002 |
| Lap Shear Strength (Copper) ⁽ᵃ⁾ | 11 (1600) | mPa (psi) | ASTM D 1002 |
| Lap Shear Strength (Polycarbonate) ⁽ᵃ⁾ | 2.2 (320) | mPa (psi) | ASTM D 1002 |
| Lap Shear Strength (Stainless steel) ⁽ᵃ⁾ | 8.2 (1200) | mPa (psi) | ASTM D 1002 |
| Tensile Strength | 17 (2400) | mPa (psi) | ASTM D 638 |
Table 2 of 6
8 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| CTE (After Tg) ⁽ᵇ⁾ | 107 (225) | ppm/˚C (ppm/°F) | ASTM E 831 |
| CTE (Prior Tg) ⁽ᵇ⁾ | 74 (165) | ppm/˚C (ppm/°F) | ASTM E 831 |
| Glass Transition Temperature (Tg) | 56 (133) | °C(°F) | ASTM D 3418 |
| Specific Heat Capacity (at 25°C, 77°F) | 1.5 | J/(g·K) | ASTM E 1269 01 |
| Thermal Conductivity (at 100°C, 212°F) | 0.72 | W/(m·K) | ASTM E 1461 92 |
| Thermal Conductivity (at 25°C, 77°F) | 0.79 | W/(m·K) | ASTM E 1461 92 |
| Thermal Conductivity (at 50°C, 122°F) | 0.59 | W/(m·K) | ASTM E 1461 92 |
| Thermal Diffusivity (at 25°C, 77°F) | 0.33 | mm2/s | ASTM E 1461 92 |
Table 3 of 6
5 rows| Characteristic | Value | Unit |
|---|---|---|
| Working Life (at 22°C, 72°F) | 1 | h |
| Full Cure (at 100°C, 212°F) | 20 | minute |
| Full Cure (at 22°C, 72°F) | 72 | h |
| Full Cure (at 65°C, 149°F) | 2.5 | h |
| Full Cure (at 80°C, 176°F) | 1 | h |
Table 4 of 6
8 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| Breakdown Voltage (at 2.4 mm) | 40,700 (40.7) | V (kV) | ASTM D 149 |
| Breakdown Voltage (at 3.175 mm) [1/8"] | 47,000 (47) | V (kV) | Reference fit ⁽ᵃ⁾ |
| Conductivity | 4.8 x 10⁻¹³ | S/cm | ASTM D 257 |
| Dielectric Constant, k´ (at 1 MHz) | 3.1 | — | ASTM D 150-11 |
| Dielectric Dissipation, D (at 1 MHz) | 0.01 | — | ASTM D 150-11 |
| Dielectric Strength (at 2.4 mm) | 431 (17) | V/mil (kV/mm) | ASTM D 149 |
| Dielectric Strength (at 3.175 mm) [1/8"] | 376 (14.8) | V/mil (kV/mm) | Reference fit ⁽ᵃ⁾ |
| Resistivity | 2.1 x 10¹² | Ω·cm | ASTM D 257 |
Table 5 of 6
3 rows| Characteristic | Value | Unit |
|---|---|---|
| Constant Service Temperature | -40 to 175 (-40 to 347) | °C(°F) |
| Intermittent Temperature Limit ⁽ᵃ⁾ | -50 to 200 [-58 to 392] | °C(°F) |
| Storage Temperature of Unmixed Parts | 16-27 (61-81) | ˚C(˚F) |
Table 6 of 6
4 rows| Characteristic | Value | Unit |
|---|---|---|
| Density | 1.57 | g/mL |
| Mix Ratio | 2:1 | Volume |
| Mix Ratio | 2.4:1 | Weight |
| Viscosity (at 25 ˚C, 77°F) | 16200 (16.2) | cP (Pa·s) |
