3M's 3659/14SF is a 100 foot roll of Gray UltraSoft Friction Tape. It is used for sealing, protecting and insulating a range of electrical, mechanical and industrial applications. It is a conformable, self-fusing ethylene propylene rubber (EPR) tape combined with a proprietary silicone adhesive. The tape bonds to itself quickly and firmly when wrapped and is also resistant to water, oil, salt, acids, and alkalis. Additionally, it can handle extreme temperatures (–85°F to +400°F).