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Re: Pointseries gaps 'vs' oth
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To: tesla-at-grendel.objinc-dot-com
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Subject: Re: Pointseries gaps 'vs' oth
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From: jim.fosse-at-genie-dot-com
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Date: Sat, 17 Feb 96 04:21:00 UTC 0000
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Chuck,
I have the specs on General Electric FR-4, it's a fiberglass epoxy circuit
board material. For 0.059" material:
Thermal
glass transition temp: 135 +-5
Z-axis expansion (%) 4.5
Electrical
dielectric constant -at-1Mhz 4.7
Dissipation Factor -at-1Mhz 0.02
Dielectric Breakdown 75Kv
Arc Restance (seconds) 120
Volume Resistivity (megohm cm) >10^5 or 10^6 cant read the fax
Surface Resistivity (megohm) >10^4
Physical
Water Absorption (%) 0.09
Flexural Strength (psi) length 85,000
cross 60,000
Flexural Modulus (psi) length 3.0x10^6
cross 2.5x10^6
Izod impact, Edgewise length 10.0
(ft-lbs/in) cross 5.7
Rockwell Hardness (Mscale) 110
hope this helps
jim