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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 >