(trying to keep up with the backlog of email...)
Where can one find quarter ounce copper clad FR4 cores and foil that
don't jack up the board price phenomenally? If we lower the copper
weight (with designer/customer's permission) to acheive the proper
etching and target feature spacings (and impedance), it helps to
manufacture. However, materials with these copper weights appear to be
so expensive that it boosts the board price too much to make it.
Steve U.
On Sun, 12 Sep 1999 22:51:00 -0700 "Wang, William (Suzhou Laminate)"
<[log in to unmask]> writes:
> Roland:
> Thanks for your input.
> Most popular copper foil thickness is 0.5 OZ, 1 OZ, 2 OZ;
> Thicker foil like 3 OZ and 4 OZ is available too;
> Thinner foil may range from 0.6 um to 12 um, such as 0.6, 3, 9,
> 12
> um (some of them with carrier which is typically 18 um; Someone say
> 3 um
> is microthin, 0.6 um is ultrathin.
>
> Thanks and best regards
> William
> ----------
> From: Roland
> To: TechNet E-Mail Forum.; Wang, William (Suzhou Laminate)
> Subject: Re: [TN] PCB use 1 OZ & H OZ copper
> Date: Monday, September 13, 1999 1:10PM
>
> IMO,
>
> Incoming material should be checked, there is small devices to check
> copper
> thickness
>
> If not detected with incoming.. then when etching the result will
> show
> either not completely etched.. which leads to suspicion of incorrect
> copper
> thickness, or over etched leading to same. In both cases we are in
> trouble,
> both the manufacturer and the supplier..
>
> Then UN will send US militaries .... oups... no, Manufacturer's
> lawyer
> will
> contact supplier's lawyer... we will likely end up like grown ups
> settling
> the matter through our quality specialist that will ask for
> guarantees
> that
> it won't be possible to happen in the future ... and get substancial
> credit
> note over some more material... if this is a repeat, then you won't
> be
> the
> supplier of this PCB manufacturer...
>
> I have an other question to you...
>
> What are the copper thicknesses that are available on the market
> today ?
>
> 0.125 oz
> 0.250
> 0.5
> 1.0
> 2.0
> 3.0
> ???
>
>
> ----- Original Message -----
> From: Wang, William (Suzhou Laminate) <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, September 13, 1999 3:39 AM
> Subject: [TN] PCB use 1 OZ & H OZ copper
>
>
> > I work for a copper clad laminate company. What will happen if
> I
> > send wrong copper foil thickness laminate to PCB fabricator?
> > 1. Customer require 1 OZ on both sides, but I send o.5 OZ on
> both
> > sides
> > 2. Customer require 0.5 OZ on both sides, but I send 1 OZ on
> both
> > sides
> > It's just a scenario analysis.
> >
> > Thanks and best regards
> > William
> > QA Manager
> > ISOLA Laminate Systems Suzhou
> >
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