The tape is heat resistant up to very high temperatures.
In addition, kapton has fantastic surface tension properties that are desirable for print adhesion.
PLA will stick down very nicely to a perfectly flat piece of kapton tape.
Some PVA glue mixed with water will ensure supreme adhesion on kapton with PLA. Spread a little before each print for good results, easy to remove also when the print is done.
Note: One roll of kapton tape is included with purchase of a new Portabee GO or KIT 3D printer.
Fun fact: Kapton is used on the sub orbital spacecraft spaceshiptwo