Lanmar #645-5 is a 4 mil heavy-duty PTFE coated fiberglass tape with a silicone adhesive. The reinforced fiberglass weave and heavier PTFE coating deliver increased break strength and longer service life compared to standard PTFE fiberglass tapes — making this the right choice for high-cycle heat sealing, heavy conveyor applications, and demanding release surfaces where standard tapes wear prematurely.

The silicone adhesive maintains strong, stable tack across the full operating range. Rated from -100 to +500°F. Dielectric strength: 6000V.

Specifications: 4 mil PTFE backing / 6 mil total thickness. Break strength: 180/160 lb/in. Elongation: <5. Adhesion: 48 oz/in.

Common applications include continuous heat sealer bars, heavy packaging lines, roll covering on industrial machinery, and high-cycle non-stick conveyor surfaces. Supplied in roll form. Available custom slit to width.