Interam gasket is used to wrap around the outside edge of a catalytic combustor. It will need to be replaced each time the combustor is removed from the wood stove.
Check with your woodstove manufacturer to see if it is required.
Warning: This product can expose you to chemicals including aluminosilicate, which is known to the State of California to cause Cancer.
For more information, go to www.P65Warnings.ca.gov.