Greenwood wood gasifcastion boiler

[Ricktp1]

Hi newbie here,
I have been using a Greenwood Frontier boiler for 5yrs now. I was hoping that someone here might know what kind of heat resistant fabric is used under & around the heat exchanger. I've been trying to reach someone at Greenwood for 3 weeks now with no luck. Never had a problem reaching them before. The fabric is white, flexible & 1/8" thick.
Thanks
Rick

 

[SuperSpy]

If it looks like white fiberglass, it's probably a form of ceramic fiber insulation. There are quite a few options but it's fairly cheap and can be found online.

Here's an example: https://www.amazon.com/dp/B015GD0QCW/?tag=hearthamazon-20