Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Archives > September 2016 > 2016.09.14 > 01Prev  Next

Testing Pouch Sealants
By John A. Tuttle

Hi All,  Okay, here's my dilemma.  While all of the pouch sealants
that I've tested work better at just 5" of vacuum than what would
ever be required under normal operating circumstances, there are

The main problem I've encountered revolves around creating a "fair
test".  I've concluded that for the testing to be fair, I must keep
applying each sealant until each pouch achieves the same leakage rate
as the pouch with the lowest leakage rate after just one application
of the sealant.

Without going into great detail, I think you'll get the point.  If
pouch 'A' has a leakage rate of 2.4 bubbles per second after one
application of sealant, can further testing be 'fair' if pouch 'B'
has a leakage rate of 9 bubbles per second after one application of

While it might seem obvious that sealant 'A' did a better job of
sealing the leather than sealant 'B', your thinking might change if
you also discovered that sealant 'A' caused the pouch to become two
times stiffer than sealant 'B'.  So, if I'm comparing apples to apples,
wouldn't it be more fair to seal all of the pouches to the point where
their leakage rates are identical?  What's your opinion?


John A Tuttle
Brick, New Jersey, USA

(Message sent Wed 14 Sep 2016, 11:46:11 GMT, from time zone GMT-0700.)

Key Words in Subject:  Pouch, Sealants, Testing

Home    Archives    Calendar    Gallery    Store    Links    Info   

Enter text below to search the MMD Website with Google

CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2024 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Please Support Publication of the MMD with your Generous Donation

Pay via PayPal

No PayPal account required

Translate This Page