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Date:
June 14, 1999 11:19 AM
Author:
Frank
Subject: Fr4 Properties
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?
(http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=11053)
Date:
June 16, 1999 02:14 PM
Author:
davef
Subject: Re: Fr4 Properties
| 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
(http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=11054)
Date:
June 18, 1999 03:31 AM
Author:
Frank
Subject: Re: Fr4 Properties
| | 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.
(http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=11055)
