That depends on the type of chimney and temperature of the flue gas. For example if you have an appliance that burns home heating oil and you are installing the vent pipe into the chimney you would not use this product. You would use cement to fill in big holes. However if you were installing a gas appliance that uses stainless steel venting material you might use this on the joints connection the stainless steel fittings. Thus I would need to know more about the specific application.
-75 to +650F service temp
Yes, this will adhere to metal. It cures in 1 hour. Allow 24 hours for full cure and strength.
it has for me so far on a wood heater in the hangar.
First I would never put it on the heating element in a dishwasher. But barring that I can’t think of any other area inside that would get to hot for this material. So I don’t see a problem with it.
I am sorry but I am not sure what the abbreviation exst stands for. If you mean exterior, yes you can use it in exterior applications.
Provided the temperature in an around this product does not exceed 650 F. To put this in perspective wood fires can reach 1100 F and coal fires can reach 3590 F. If the silicone is going to come in contact with the hottest point the answer is no. This silicone is meant to be used at enough of a distance from the actual combustion that much of the intensity of the heat has dissipated.
I am sorry but these questions are routed to the supplier of the product you are looking at when you ask the question. So in this case I am the supplier of the silicone. Thus I don;t know if they sell pellets in your area. I am in Massachusetts and they do here.