It would be useful to know what cassette brands 
  and product numbers have developed sticky-shed. If there is a date of 
  recording as well, that could contribute to identifying those at risk. Of 
  course, this does not "date" that tape but gives some idea of when it was in 
  use.
   
  ****
   
  Have no numbers, 
  but from my experience:
   
  Intermagnetics brand from the mid-80s
  **All** types of Memorex 
  Anonymous, studio made cassettes - really any era
   
  These are the major squealers in my collection.
   
  
  David N. Lewis
Assistant Classical Editor
All Media 
  Guide
301 E. Liberty Suite 400
Ann Arbor, MI 
  48104
davlew@xxxxxxxxxxxx