This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.
From: 70233.255@CompuServe.COM (Michael Platt )
Thermalite is a brand name for igniter cord. Purchase and storage of
igniter cord is regulated by BATF. Purchase and/or storage of igniter
cord, IN ANY QUANTITY, requires an explosive license and an approved
storage facility, i.e. an explosive magazine. This includes thermalite
in any length, including the one inch lengths commonly included with
motors produced by various manufacturers. The only exception to this
would be the purchase by a user for immediate use in the state where
he/she resides.
 
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