Re: Flammability Requirement for Gaskets and Seals - UL 61010-1
It depends on where the gasket is.
Easiest route to compliance is generally containment option in Figure 11, so if you meet clause 9.3.2 (b) then I don't think there should be much on an issue.
What flammability rating does the gasket have?
Is it fitted in any kind of recess, or just sat between two flat surfaces?