G-2839A/B is a filled, two-part epoxy casting system. It is designed for applications requiring heat and thermal shock resistance. It is particularly useful for encapsulation where rigid or flexible wire leads are involved such as vinyls. G-2839A/B是一种双组分环氧浇铸胶。该产品被设计用于需要抵抗高的机械冲击和热冲击场合。特别是用于灌封刚性或柔性的乙烯基电线引线。
PROPERTIES OF UNCURED MATERIAL固化前材料性能
Properties 性能 | Test Method 测试方法 | Resin-A 环氧树脂-A | Hardener-B 固化剂-B | Mixed-A/B 混合物-A/B |
Color/Appearance 颜色/外观 | Visual 目测法 | Paste like liquid, Black or natural 糊状黑色或自然色液体 | Light colored liquid浅色液态 | Black or natural 黑色或自然色 |
Specific Gravity 比重 | ASTM D-792 | 1.6 | 1.05 | 1.5 |
Viscosity @ 25°C, cps粘度（25°C） | ASTM D-2393 | 60,000-90,000 | 14 - 20 | 1800 - 2500 |
Shelf life, 25°C, month保质期，月 |
| 12 | 12 |
|
TYPICAL CURED PROPERTIES固化后属性
Property性能 | Test Method测试方法 | value数值 |
Hardness (Shore D)硬度 | ASTM D-2240 | 82 |
Elongation at break断裂延伸率，% |
| 3 |
Tensile strength拉伸强度,psi |
| 8600 |
Compressive strength抗压强度, psi |
| 22,000 |
Flexural strength,弯曲强度psi | ASTM D790 | 15,000 |
Impact strength,冲击强度ft-lb/in |
| 0.5 |
Heat deflection temperature, 热变形温度ºC at 264 psi |
| 90 |
Thermal Conductivity导热率, W/M-K |
| 0.46 |
Coefficient of thermal expansion 热膨胀系数, CTE | ASTM D3386 | 47 E-06 |
Water absorption吸水率,% weight,24 hours |
| 0.2 |
Volume resistivity体积电阻率, ohms-cm |
| 4.0E14 |
Dielectric constant介电常数 | ASTM D150 | 4.5(100Hz), 4.4(10 Hz) |
Dissipation factor耗散因子 |
| 0.009(100Hz), 0.016(10kHz) |
Arc resistance, seconds弧抗，秒 |
| 140 |
Dielectrics strength,介电强度, V/mil | 10mil thick | 1525 |
CURING SCHEDULE固化步骤
Resin/Hardener Ratio (by weight) 树脂与固化剂重量比 | 100 / 15 |
Resin/Hardener Ratio (by volume)树脂与固化剂体积比 | 100 / 24 |
Pot Life (200 gram mass), 25°C, minutes保质期（200g）25°C，分钟 | 70-90 |
CURING TIME TABLE固化进度表
Temperature温度 | Minimum Cure Time最少固化时间 |
25 ºC (77ºF) | 24 hours 24小时 |
60 ºC (158ºF) | 3 hours 3小时 |
SHELF METHOD保存方法
Store at 15 - 30 ºC in a dry place. After each use, tightly reseal.每次用完后，应密封保存于15 - 30 ºC的干燥地方。
