Polytetrafluoroethylene is, 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 its high impact strength, its resistance to wear, durability and creep resistance are low 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 show little or no attraction for dissimilar molecules. All combine to give a 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 and 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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