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March 1999

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Subject:
From:
Thomas DeSmit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 18 Mar 1999 10:13:12 -0600
Content-Type:
text/plain
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text/plain (83 lines)
Anne,

I couldn't find any definitions for CTI, but I did find some people who were
spec'ing it for different materials used in electronics/electrical usage.
The CTI was specified in Volts, and the people who specified it said it was
tested using the following standards:

UL746
DIN 53480
IEC 60664-1
IEC 60664-3

I didn't have much luck finding these standards, but maybe that will help
you in your search.

Thomas DeSmit
EDA Librarian/Sr. Engineering Tech.
IFR Americas, INC.

The opinions expressed are my own, and do not necessarily reflect those of
my employer.

> -----Original Message-----
> From: TechNet E-Mail Forum. Anne Ledger <[log in to unmask]>
> [mailto:[log in to unmask]]
> Sent: Thursday, March 18, 1999 10:21 AM
> To: [log in to unmask]
> Subject: [TN] Comparative Tracking Index?
>
>
> Good Morning TechNet,
>
> I have a fabrication drawing with a note with the following note.
>
> Material:  .062 laminated glass (woven fabric) base, epoxy resin, Flame
> retardent, FR4.
>               copper clad 2 oz./sq ft.  Laminate must be certified to
> have a minimum comparative
>               tracking index of 175.  Microsection demonstrating
> compliance with copper weight,
>               dielectric spacing, line width and use of CTI 175 or
> better material shall be shipped
>               with each lot.
>
> I am at a loss on the CTI 175 stuff.  I have reviewed IPC 4101 and don't
> find a reference.  I have
> placed a call to our material supplier but no response yet.  The TechNet
> seems much faster.
> Can anyone provide me with a clue?  Thanks in advance for the help.
>
> Anne Ledger
> EMDS, Inc.
> [log in to unmask]
>
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