PTFE

Polytetrafluoroethylene, commonly referred to as PTFE Teflon,

PTFE material resists attack by heat, as well as from just about all chemicals. it's insoluble in all organics, with the exception of some exotics. Its electrical properties are excellent making it a popular option for machined parts. Though it's high impact strength, its resistance to wear, durability and creep resistance are low as compared to alternative engineering grade thermoplastics. Mechanical properties are often improved by adding fillers like glass fiber, bronze, Delrin, carbon, and/or graphite.

PTFE Rod, Sheet, and Tube exhibit the lowest electrical constant and lowest dissipation factors of all solid materials. Due in part to its sturdy chemical linkage, Teflon® PTFE Sheet, Rod, and Tube shows little or no attraction for dissimilar molecules. All combined, leading to a coefficient of friction as low as 0.05. Once again, as a result of this chemical bonding, PTFE Teflon® resins are nearly insoluble.

Teflon can be machined to close tolerances, we deliver the exact PTFE, FEP, PFA machined parts you need.

PROPERTY ASTM or UL TEST Teflon® unfilled Teflon® 25% glass filled Teflon® 25% carbon filled
PHYSICAL
Specific gravity (lb/in³) D-792 0.078 0.081 0.075
Water Absorption, immersion 24 hours (%) D-229 ‹0.01 0.02 0.05
MECHANICAL
Tensile strength (psi) D-638 3,900 2,100 1,900
Tensile elongation at break (%) D-638 300 270 75
Tensile modulus (psi) D-638 80,000 - -
Flexural strength (psi) D-790 no break 1,950 2,300
Izod impact, notched (ft-lbs/in of notch) D-256 3.5 - -
Flexural modulus (psi) D-790 72,000 190,000 160,000
THERMAL
Melting temperature (°F / °C) D-3418 635° / 335° 635° / 335° 635° / 335°
Flammability Rating UL-94 V-0 V-0 V-0
Coefficient of linear thermal expansion (x 10-5 in./in./°F) D-696 7.5 6.4 6.0
ELECTRICAL
Dielectric strength, short time .125" thick (V/mil) D-149 285 - -

BENEFITS OF PTFE, FEP, & PFA MACHINING:

  • Excellent dielectric properties
  • Inertness to most chemicals
  • High heat and chemical resistance
  • Very low coefficient of friction
  • Excellent radiation resistance
  • Zero moisture absorption
  • Relatively insensitive to power frequency
  • Machinability

ADVANTAGES

  • High pressure resistance and hardness
  • Good sliding and wear characteristics
  • Good thermal conductivity
  • Good chemical resistance
  • Low insulation and surface resistance
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