Bob
You didn't say if you have to do it - do you?
If you do, then a conformal coating will resolve the issue. Ask the
supplier to provide the CTI for their coating. Its an old test that
is really not applicable to circuit boards - IPC-CC-830 tests would
be better.
Kindest regards,
Graham
[log in to unmask]
On 26 Jul 2007, at 23:39, Bob Wilson wrote:
> Hi,
> Can anyone shed some light on this term? (Comparative Tracking
> Index).
>
> Googling it tells me "...CTI is used to measure the electrical
> breakdown
> (tracking) properties of an insulating material. To measure the
> tracking, 50
> drops of 0.1% ammonium chloride solution are dropped on the
> material, and
> the voltage measured for a 3mm thickness is considered
> representative of the
> material performance."
>
> 20+ years of doing board layout and I just heard of it. How does
> it apply
> to printed circuits?
>
> As my old man used to say: Every day is school...if you pay attention.
>
> Regards,
>
> Bob Wilson
> E/M Designer, CID
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
> Sent: Tuesday, July 24, 2007 12:26 PM
> To: [log in to unmask]
> Subject: Re: [TN] [RoHSUSAPushback] Round 7 EU exemptions
>
> Hi John
>
>
>
> If you go to the http://www.RoHSUSA.com <http://www.rohsusa.com/>
> web site
> and click the button on the left marked exemptions latest it will
> link you
> to the latest information.
>
>
>
> Kind regards.
>
>
>
> John
>
>
>
>
>
>
>
> John Burke
>
>
>
> (408) 515 4992
>
> _____
>
> From: [log in to unmask]
> [mailto:[log in to unmask]] On Behalf Of John Lau Hon-
> Shing
> Sent: Tuesday, July 24, 2007 11:00 AM
> To: [log in to unmask]; (Leadfree Electronics Assembly
> Forum);
> TechNet
> Subject: RE: [RoHSUSAPushback] Round 7 EU exemptions
>
>
>
> Dear John:
>
>
>
> (1) Thanks, you are so helpful.
>
> (2) I have one more question, please direct me to the right link
> for the
> exemptions granted by the EU Commissioner so far.
>
>
>
> As always, thank you very much for your help!
>
>
>
> Best Wishes!
>
>
>
> John H. Lau
>
> Microsystems, Modules & Components Laboratory
>
> Institute of Microelectronics
>
> 11 Science Park Road
>
> Singapore Science Park II
>
> Singapore 117685
>
> TEL:(65)6770-5424; [log in to unmask] <mailto:[log in to unmask]>
> star.edu.sg
>
>
>
>
>
> _____
>
> From: [log in to unmask]
> [mailto:[log in to unmask]] On Behalf Of John Burke
> Sent: Tuesday, July 24, 2007 11:22 PM
> To: [log in to unmask]; '(Leadfree Electronics Assembly
> Forum)'; 'TechNet'
> Subject: [RoHSUSAPushback] Round 7 EU exemptions
>
> The link to the new exemption requests for round 7 of the new
> exemption
> requests is here:
>
> http://ec.europa. <http://ec.europa.eu/environment/waste/
> rohs_7_consult.htm>
> eu/environment/waste/rohs_7_consult.htm
>
> It is also reached by clicking the 4th button from the home page of
> http://www.rohsusa. <http://www.rohsusa.com/> com
>
> Kind regards,
>
> John Burke
>
> John Burke
>
> (408) 515 4992
>
> _____
>
> From: [log in to unmask]
> [mailto:[log in to unmask]] On Behalf Of John Lau Hon-
> Shing
> Sent: Monday, July 23, 2007 10:31 PM
> To: [log in to unmask]; (Leadfree Electronics Assembly
> Forum);
> TechNet
> Subject: RE: [RoHSUSAPushback] Xbox 360 1 billion dollar
> reliability problem
>
> Dear John:
>
> Thank you very much for your speedy response. I agree with you that
> so far
> no one got caught!
>
> Now I have the other question which is about exemption. The 7th set of
> exemptions is in the making (due August 10, 2007) and so far there
> are only
> 7 exemption proposals:
>
>
> <http://circa.europa.eu/Public/irc/env/rohs_7/library?l=/induction-
> type_fluo
> resce&vm=detailed&sb=Title> 1. Lead in silver rings on the exterior
> lamp
> surface of induction-type fluorescent lamps.
>
>
> <http://circa.europa.eu/Public/irc/env/rohs_7/library?l=/
> mercury_displays&vm
> =detailed&sb=Title> 2. Mercury in plasma displays.
>
>
> <http://circa.europa.eu/Public/irc/env/rohs_7/library?l=/
> photocells_equipmen
> t&vm=detailed&sb=Title> 3. Cadmium in Photocells for accurate
> control of
> lighting equipment.
>
>
> <http://circa.europa.eu/Public/irc/env/rohs_7/library?l=/photo-
> resistors&vm=
> detailed&sb=Title> 4. Cadmium-based photo-resistors used in
> professional
> audio equipment.
>
>
> <http://circa.europa.eu/Public/irc/env/rohs_7/library?l=/
> relock_fuse_x-09&vm
> =detailed&sb=Title> 5. RELOCK FUSE, Model X-09.
>
>
> <http://circa.europa.eu/Public/irc/env/rohs_7/library?l=/
> voltage_housings&vm
> =detailed&sb=Title> 6. High voltage diodes in glass housings.
>
>
> <http://circa.europa.eu/Public/irc/env/rohs_7/library?l=/
> beryllium_substrate
> s&vm=detailed&sb=Title> 7. Cadmium and cadmium oxide in thick film
> pastes
> used on beryllium oxide substrates.
>
> Is this correct?
>
> As always, thank you very much for your contributions and help!
>
> John H. Lau
>
> Microsystems, Modules & Components Laboratory
>
> Institute of Microelectronics
>
> 11 Science Park Road
>
> Singapore Science Park II
>
> Singapore 117685
>
> TEL:(65)6770-5424; [log in to unmask] <mailto:[log in to unmask]>
> star.edu.sg
>
> _____
>
> From: [log in to unmask]
> [mailto:[log in to unmask]] On Behalf Of John Burke
> Sent: Tuesday, July 24, 2007 1:25 PM
> To: [log in to unmask]; '(Leadfree Electronics Assembly
> Forum)'; 'TechNet'
> Subject: RE: [RoHSUSAPushback] Xbox 360 1 billion dollar
> reliability problem
>
> Hi John,
>
> I believe all "findings" are dealt with by warning the companies
> concerned
> so that they "adjust" their product design.
>
> I do not know of any general product that has been "caught" in the
> EU and
> been made public as to the name of the company product type etc.
>
> Kind regards,
>
> John
>
> John Burke
>
> (408) 515 4992
>
> _____
>
> From: [log in to unmask]
> [mailto:[log in to unmask]] On Behalf Of John Lau Hon-
> Shing
> Sent: Monday, July 23, 2007 9:02 PM
> To: [log in to unmask]; (Leadfree Electronics Assembly
> Forum);
> TechNet
> Subject: RE: [RoHSUSAPushback] Xbox 360 1 billion dollar
> reliability problem
>
> Dear John:
>
> Would you please tell me, as of today, is there any product get
> caught by
> any of the EU countries?
>
> Thanks & Best Wishes!
>
> John H. Lau
>
> Microsystems, Modules & Components Laboratory
>
> Institute of Microelectronics
>
> 11 Science Park Road
>
> Singapore Science Park II
>
> Singapore 117685
>
> TEL:(65)6770-5424; [log in to unmask] <mailto:[log in to unmask]>
> star.edu.sg
>
> _____
>
>
> NOTE: If you are not the intended recipient of this communication,
> please
> notify the sender and delete it. As it may contain confidential or
> official
> information, do not retain it or disclose the contents to any
> person as it
> may be an offence under the Official Secrets Act. Thank You.
>
> __._,_.___
>
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