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Thank.  This is what I needed.

Steve

-----Original Message-----
From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Melissa Widzinski
Sent: Friday, August 19, 2016 12:48 PM
To: [log in to unmask]
Subject: Re: [ARSCLIST] Tape thickness measurement

Hi Steve,
There is a good section on tape thickness in IU's FACET formats document, linked here, starting on PDF page 9:
http://www.dlib.indiana.edu/projects/sounddirections/facet/facet_formats.pdf

1.      Tape with a total thickness of approximately 1.77 to 2.13 mils has
a nominal base thickness of 1.5 mils.

2.      Total thickness of approximately 1.27 to 1.51 mils has a nominal
1.0 mil base thickness.

3.      Total thickness of approximately 0.67 to 1.03 mils has a 0.5 mil
base thickness-- lower numbers (around 0.7 mils) are triple play tapes while higher numbers (around 1 mil) are double play.

Hope this helps!

Melissa Widzinski

Audio Preservation Engineer

Media Digitization and Preservation Initiative

Indiana University

https://mdpi.iu.edu/

On Fri, Aug 19, 2016 at 12:00 PM, Lou Judson <[log in to unmask]> wrote:

> How do they not match? Too thick or too thin?
>
> The mil values are for the backing material only, not including the 
> oxide or backcoating, as I recall.
>
> <L>
> Lou Judson
> Intuitive Audio
> 415-883-2689
>
> On Aug 19, 2016, at 8:01 AM, Steven Smolian <[log in to unmask]> wrote:
>
> > What is the best method at reasonable cost of measuring tape 
> > thickness
> of a
> > large number of  tapes?  I'm using a digital micrometer and getting
> results
> > tat don't match the conventional .05, 1.0, 1.5 mil measurements.
> >
> > Am I squeezing the jaws too tightly?
> >
> >
> >
> > Steve Smolian
>