Re: [TCML] Colour of G10

["Brian Foley" <ka1bbg@xxxxxxxxxxx>]

HI, perhaps it has to do with the light green is easy to see where light
yellow to light brown is difficult to see electronically
such as the eye of a camera for positioning the board during the photo-etch
process....Marantz for years used solid blue color, and the telephone used a
maroon color, and for electric insulation in switch gear the favorite color
is red.........some one may have a better description than this. cul brian
f.


      www.genapro.com
----- Original Message ----- 
From: "Marina Moudrak" <way_mmm@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, April 23, 2008 2:34 PM
Subject: Re: [TCML] Colour of G10


> Thank you all for your comments.
>
> The glass fiber reinforcement used for G10 is definitely colorless.
>
> The color of epoxy resin is yellow before curing, and after curing it
becomes yellowish. That is the reason of yellowish color of G10.
>
> I hope to find out the advise what kind of dye should be added to achieve
this light green colour. It is not difficult to obtain bright green color,
as for the PCB, but not this light grayish green color.
>
> In Europe the yellowish G10 and G11 is widely used, but not so in North
America. The color does not improve the properties of the material, yet
> there is some preferences to use pale green color.
>
> I am still hope to find the answer...
>
> Regards,
>
> Marina
>
> --- On Wed, 4/23/08, Helen Lo <quarkster@xxxxxxx> wrote:
>
> > From: Helen Lo <quarkster@xxxxxxx>
> > Subject: Re: [TCML] Colour of G10
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Received: Wednesday, April 23, 2008, 1:00 AM
> > The glass fiber reinforcement is essentially colorless. The
> > color of G10 composite comes from the epoxy resin. G10
> > color varies from manufacturer to manufacturer, and ranges
> > from a yellowish-tan to pale green. The color of the
> > uncured epoxy resin an be quite different from the final
> > cured state. G10 and the familiar FR4 printed circuit board
> > material are nearly identical, the FR4 having a
> > fire-retardant added to the epoxy. G11 and FR5 are another
> > grade of glass/epoxy composite that have a higher operating
> > temperature than G10/FR4, and range in color from a
> > yellow-green to pale amber. All these materials can be
> > obtained in other colors on special order. Some companies
> > fabricate prototype or experimental PCBAs using red FR-4 so
> > there is no chance that an experimental PCBA will
> > "accidentally" get shipped in a production
> > product.
> >   Regards,
> >   Scott Hanson
> >
> > DC Cox <resonance@xxxxxxxxxxxx> wrote:
> >   The laminated material is glass fibers, hence the green
> > color. The G in
> > G-10 stands for "glass" laminate.
> >
> > Dr. Resonance
> >
> >
> >
> >
> > On Tue, Apr 22, 2008 at 3:14 PM, Marina Moudrak wrote:
> >
> > > Hello all,
> > >
> > > I would like to ask you all a question regarding G-10
> > laminate.
> > >
> > > I wonder how G-10 becomes light green in colour? An
> > epoxy resin used for
> > > G-10 is yellow, the standard colour should be
> > yellowish, if I am right.
> > >
> > > What kind of technology gives this light green colour
> > and for what reason?
> > >
> > > Thank you,
> > >
> > > Marina
> > >
> > >
> > >
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