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Re: Pointseries gaps 'vs' oth



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