Answer: mylar

AnswerCrossword Clue
MYLARBirthday-balloon material
mylarbrand of strong, thin polyester film used in photography, recording tapes, and insulation
mylarstrong polyester film
mylarused for a polyester film
MYLARShiny balloon polyester
MYLARSpace blanket material
MYLARReflective material
MYLARSolar sails material
MYLARInsulation material
MYLARFilm used for recording tapes
MYLARHelium balloon material
MYLARTrademark in the film business
MYLARBalloon material
MYLARLong-lasting balloon material
MYLARShiny balloon material
MYLARPolyester sheet
MYLARCollectible comic book protection
MYLARPolyester film brand
MYLARPolyester film trademark
MYLARStrong polyester film
MYLARHelium-balloon material
MYLARRecording-tape polyester brand
MYLARReflective material for helium balloons
MYLARFloppy disk material