Material FR-4 |
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The materials covered by the specification FR-4 classification NEMA, is most often used for the production of double-sided and multilayer printed circuit boards. |
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Properties |
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The test conditions |
Units of measure |
Values |
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The surface resistance |
high humidity |
F |
Megohm |
> 1000000 |
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high temperature |
E-24/125 |
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Volume resistance |
high humidity |
F |
Megohm * cm |
> 10000 |
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high temperature |
E-24/125 |
|
> 1000 |
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Dielectric breakdown |
D-48/50 + D-0.5/23 |
KV |
> 40 |
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The dielectric constant at 1 MHz |
C-40/23/50 |
|
< 5.4 |
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The dielectric loss tangent at 1 MHz |
C-40/23/50 |
|
< 0.035 |
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Дугостойкость |
D-48/50 + D-0.5/23 |
sec |
> 60 |
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Прочность на разрыв при слое меди 35 мкм |
усредненный |
A |
N/mm |
> 1.4 |
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после термического воздействия |
A |
N/mm |
> 1.4 |
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The requirement for soldering |
288 С, 20 сек |
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not stratified |
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288 С, 20 сек |
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Flexural strength |
longitudinal |
A |
MPa |
> 410 |
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transverse |
A |
MPa |
> 340 |
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Water Absorption |
E-1/105 + des + D-24/23 |
% |
0.1-0.77 |
< 0.8 |
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0.78-3.2 |
< 0.35 |
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E-1/105 + des |
% |
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Flammability |
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A & E-1/105 + des |
94V-0 |
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Dimentions stability |
E-4/105 + des + E-2/150 |
mkm/cm |
+-4.92 |
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