[sdiy] Need a TO220 thermo pad that can withstand 130vdc without arcing..

[grant musictechnologiesgroup.com]

I don't know your exact application, but I've used Sil Pads before and 
they were very pleasant to use. I would not attempt Kapton tape for this 
(or much of anything really) because the actual mounting matters. Use a 
shouldered washer if needed.

Some common options

Silicone:
https://mou.sr/40ReI24
https://www.mouser.com/datasheet/2/2/Aavid_04242019_53_x_2-1578895.pdf

Ceramic:
https://mou.sr/3CySTqL
https://4donline.ihs.com/images/VipMasterIC/IC/AAVT/AAVT-S-A0001001659/AAVT-S-A0001001659-1.pdf?hkey=CECEF36DEECDED6468708AAF2E19C0C6


GB