THF (tetrahydrofuran) is the most typical solvent for Mylar.
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Mylar is a type of strong thin polyester that is used most notably in Mylar ballons, but is also used at certain tapes, fabric, and insulating sheeting.
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Mylar balloons can be bought in various retail stores or
completely online. Mylar balloons can be bought at 1-800 flowers,
Gift Tree or Bargain Balloons the website.