Material FR-5 |
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The material FR-5 is applied in production of multilayer printed-circuit boards. It has several essential advantages: high temperature of vitrification provides the high level of stability of the linear sizes and the lowered water absorption. |
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Indicators |
Conditioning conditions |
Values |
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Temperature
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Vitrification temperature, Тg, o C |
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155 |
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Coefficient of temperature expansion (from 40 o to 120 o C), mm/ o C |
T |
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on an axis Х |
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7,7 x 10 -6 |
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on an axis Y |
|
8,0 x 10 -6 |
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on an axis Z |
|
8,9 x 10 -5 |
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Electrical
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Dielectric permeability with a frequency 1 MHz |
С - 40/23/50 |
4,75 |
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Tangent of angle of dielectric losses with a frequency 1 MHz |
С - 40/23/50 |
0,02 |
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Dielectric breakdown, kV |
|
45 |
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Specific volume electric resistance, Ohm x cm, not less |
E - 24/125 |
1,0 x 10 11 |
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Physical
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Durability on flaking of a foil, N/mm, not less |
normal conditions |
1,8 |
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after a heatstroke (260 o С/30 sec) |
1,8 |
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E - 1/125 |
1,44 |
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Time of resistance to influence of the melted solder, sec, not less |
288 o С |
120 |
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Water absorption, not more |
D - 24/23 |
0,1 |
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Combustibility |
normal conditions |
V0 |
