Teflon Bar

Product Description

Teflon bars—chemically known as Polytetrafluoroethylene (PTFE) bar stock—are high-performance engineering thermoplastic profiles (rounds, squares, sheet/flats, and hollow tubes). They are widely specified for extreme environments requiring near-zero friction, exceptional chemical inertness, wide thermal stability, and high dielectric strength.

Common PTFE Grades & Compound Fillers

While Virgin PTFE offers the highest purity and electrical insulation, unfilled PTFE is prone to mechanical deformation under continuous load ("cold flow" or creep). Commercial bars are frequently alloyed with performance fillers:

Technical Performance Characteristics

• Temperature Range: Continuous operating limits from -200°C to +260°C (-328°F to +500°F).

• Coefficient of Friction: Extremely low static/dynamic friction ($\mu \approx 0.05 \text{ to } 0.10$), preventing stick-slip behavior.

• Chemical Inertness: Impervious to virtually all industrial chemicals, solvents, and acids (attacked only by molten alkali metals and elemental fluorine at high pressures).

• Water Absorption: Non-hygroscopic ($< 0.01\%$), ensuring dimensional stability in humid or submerged applications.

• Machinability: Easily turned, milled, and drilled using standard metalworking tooling, though sharp tools and high speeds are required to prevent stock deflection.