Ouch! That tape is expensive.
In the industry normal PVC electrical tape is used as that has good Emissivity. Sadly the temperatures you are looking to create will fry most common tapes that I would use. There are high temperature Mylar and Kapton tapes but you would need to test their Emissivity using a simple boiling water test. Set your cameras Emissivity to 0.96. Place the tape on a baked bean (or similar) tin of boiling water, measure the waters temperature using a thermocouple, or you could just view the water with the camera (water Emissivity is good), then view the tape on the outside of the tin with an Emissivity setting of 0.96. If the readings are reasonably close, it is a decent Emissivity tape and you can test it further to determine its actual Emissivity in order to enter its value into the camera.
More on that from me if needed.
Fraser