This Non-Foil-Face FlexWrap is not UL Listed for use with chimney liners, but it is great when you need only small pieces for stuffing into nooks and crannies. Non-Foil-Face FlexWrap can also seal the space between an insert shroud and the fireplace facing, or between frames of glass doors and the fireplace facing.
WARNING: Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.