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Material FR-5

 

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.


Indicators

Conditioning conditions

Values

 

Temperature 

 

 

 

Vitrification temperature, Тg, o C

 

155

Coefficient of temperature expansion (from 40 o to 120 o C), mm/ o C

T

 

on an axis Х

 

7,7 x 10 -6

on an axis Y

 

8,0 x 10 -6

on an axis Z

 

8,9 x 10 -5

 

Electrical 

 

 

 

Dielectric permeability with a frequency 1 MHz

С - 40/23/50

4,75

Tangent of angle of dielectric losses with a frequency 1 MHz

С - 40/23/50

0,02

Dielectric breakdown, kV

 

45

Specific volume electric resistance, Ohm x cm, not less

E - 24/125

1,0 x 10 11

 

Physical 

 

 

 

Durability on flaking of a foil, N/mm,  not less

normal conditions

1,8

 

after a heatstroke (260 o С/30 sec)

1,8

 

E - 1/125

1,44

Time of resistance to influence of the melted solder, sec, not less

288 o С

120

Water absorption, not more

D - 24/23

0,1

Combustibility

normal conditions

V0