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I have always folded the tape until I had 10 layers, then divided my 
total by ten to get the single layer thickness.  I find this helps 
reduce measurement variability due to things like changing caliber grip, etc.

Jeff


At 01:37 PM 8/19/2016, you wrote:
>On 8/19/16 12:47 PM, Melissa Widzinski wrote:
>
>>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.
>Dimensions and technical data for 3M tapes:
>http://www.aes.org/aeshc/3mtapedoc.html
>
>for Agfa, BASF and IG Farben tapes:
>http://www.aes.org/aeshc/basftapedoc.html
>
>-- John Chester
>
>
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