Metal sheeted tubular heater

Buy offer Details

Dear Sir/Madam,
This is wimde graeve from BE.
Im looking for products with the following specifications :
I am looking for a tubular heater that is coated (or another kind of operation like for example etching) so the surface becomes high emissive.
I want to use the heater to generate as much possible infrared heat. For this you need high emissive surface.
The coating ( or other treatment) cannot have a smell or odor. It should be totally oder free.
The heater will work constant at 500°C surface temperature.
Thickness 18 mm (or 20 mm -> still to be decided).
There are various lengths i will need. Bur for now please quite for a