Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

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Frank

#11053

Fr4 Properties | 14 June, 1999

Hello, I am looking for the surface resistivity and volume resistivity of standard fr4 as a function of temperature and /or humidity . can any one help?

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#11054

Re: Fr4 Properties | 16 June, 1999

| Hello, | I am looking for the surface resistivity and volume resistivity of standard fr4 as a function of temperature and /or humidity . can any one help? |

Frank: Sorry I'm so late getting back to you.

1 Use either ASTM D5109-94 or IPC-TM-650, Method 2.5.17 to measure insulation resistance 2 I'll take "C." This is multiple choice isn't it? ;-) Surface resistivity decreases logaritheically with an increase in humidity at approximately the rate of one decade per 20 percent humidity change.

Ta

Dave F

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Frank

#11055

Re: Fr4 Properties | 18 June, 1999

| | Hello, | | I am looking for the surface resistivity and volume resistivity of standard fr4 as a function of temperature and /or humidity . can any one help? | | | | Frank: Sorry I'm so late getting back to you. | | 1 Use either ASTM D5109-94 or IPC-TM-650, Method 2.5.17 to measure insulation resistance | 2 I'll take "C." This is multiple choice isn't it? ;-) | Surface resistivity decreases logaritheically with an increase in humidity at approximately the rate of one decade per 20 percent humidity change. | | Ta | | Dave F | Thanks Dave.

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