Need Gasket for Oil Furnace

Someone worked on my furnace and removed the "Burner motor/pump/transformer/igniter assembly" from the furnace. Three bolts were loosened, the oil line was disconnected and the assembly was rotated slightly to gain access to the combustion chamber. While doing so, the gasket between the combustion chamber and the assembly was destroyed. The original gasket looked like a normal type of gasket. He replaced it with "Combustion Chamber Lining." It's called "Kaowool" and manufactured by a company called "Lynn." This material is wet and the instructions state that it's supposed to be used to line a fire chamber.
Are there any oil furnace technicians out there that would actually use "Combustion Chamber Lining" instead of a gasket that is designed and or specified for the job?
I am very concerned whenever someone modifies a machine that can kill if it malfunctions.
(don't want to get) toasted
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Should he have used a real burner gasket? Yes. Will the munged fix he used work? Yes. Will you die with this substitution? No. Just make sure he brings a new gasket for service next year and all will be well.

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Kaowool is a ceramic fiber that is designed to contain heat in the combustion chamber. It is non-combustible and is similar in performance and appearance to asbestos. It is used to insulate and protect the lower portion of the metal heat exchanger from the very intense heat created at the point of ignition.

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