APT, Glass Cloth Tape with a High-Temp Thermo-Setting Silicone Adhesive. High Temperature Masking for Plasma, Thermal and Metallization Applications (25.5mm x 33M) : Amazon.co.uk: DIY & Tools
MyBoxSupply 1" x 18 yds. 3 Mil - PTFE Glass Cloth Tape, 1 Per Case | eBay