I think that the i-watermark is Isola.

This board sounds similar to a high voltage supply I worked on when I was
working on monitors at (the long dead) Monitronix. We used FR-4 material for
the supply PCB applied an acrylic conformal coat and then potted the entire
assembly in a gray-black two-part potting compound leaving only the I/O pins
exposed.  This generally worked well-eliminates the need for extra wide
spacing by insulating the conductors, but the supply engineer kept a "leaky"
one on his desk claimed it was a better wake-up then coffee ;-)!

Jeffrey A. McGlaughlin
PCB Designer
Battelle Memorial Institute
Columbus Ohio
[log in to unmask]


        -----Original Message-----
        From:   Greg Kaskey [SMTP:[log in to unmask]]
        Sent:   Wednesday, 15 December, 1999 11:12
        To:     [log in to unmask]
        Subject:        Re: [DC] [Re: [DC] PWB High Voltage Material
Choices?]

        Mark (All),

        Thank you the information.

        More details on exsisting board:
        This is a board that has been in production and it is being made
again.  The
        board material has an "i" Watermark on it (means ?).  It looks like
regular
        FR-4.

        Greg Kaskey

        ------------------------------------------
        Mark Ross <[log in to unmask]> wrote:
        Is this something that is already being produced?  FR-4 can be made
in that
        thickness as well as many other materials.  If this board is not in
        production yet and the board has no solder mask it seems to me that
you
        would need at least 1 inch or greater between the 30kv traces and
anything
        else due to its ability to jump (ESD, I have seen an ESD gun that at
25KV
        could jump a 2 inch gap once the air was sufficiently charged)across
        conductors.  Also there may be UL requirements if this product has
to go
        through their processes (For example at 120 VAC minimum spacing is
~0.063"
        between AC hot and other conductors). The clear coating could be
some form
        of conformal coating.  If you need more info let me know.

        Mark Ross


        -----Original Message-----
        From: Greg Kaskey [mailto:[log in to unmask]]
        Sent: Wednesday, December 15, 1999 10:07 AM
        To: [log in to unmask]
        Subject: [DC] PWB High Voltage Material Choices?


        All,

        I hope you are doing well.

        What PWB Material do I call out for one that is 0.074 inch thick and
it does
        High Voltage Multiplying with 30K Volt Output?

        The board has no solder mask and is encapsulated in a "Black, Rubber
Like
        Material".  Also, the Board looks like it has some kind of clear
coating
        that
        does not remind me of a "normal" protective coating which is applied
to the
        entire finished assembly; it is soft vs. hard and can be easily
scraped off.

        What questions would I need to ask to determine some of the material
        choices?

        Thanks for Helping,

        Greg Kaskey
        Sector Electronics, Inc.
        V: 770-955-8044
        E: [log in to unmask]

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