Milled glass fibers have the least effect on chemical and electrical properties and add greatly to the mechanical properties of unfilled PTFE. Addition of glass improves compressive properties by as much as 40% and improves wear resistance greatly. These compounds resist acids and oxidation but can be attacked by alkali.
30% Graphite
5% Graphite
10% Graphite
15% Graphite
20% Graphite
25% Graphite
Graphite has good chemical resistance to corrosive environments and exhibits good initial wear and rubbing/sliding characteristics in dry and water applications. Commonly blended with carbon and PTFE.
25% Bronze
40% Bronze
60% Bronze
This filler has better wear, creep resistance, and higher thermal conductivity than glass fiber with PTFE. The compound is easily machined, but has poor chemical resistance in the presence of acids and alkali. Useful in applications which undergo high mechanical loads or high-speed rubbing contacts where the bronze filler supplies the strength and conductivity to carry away excess, unwanted heat.
5% Molybdenum Disulfide
This filler is used frequently in combination with others to increase surface hardness, stiffness, and to reduce the starting coefficient of friction and steady-state wear. Its effect on electrical and chemical properties is negligible.
5% Carbon
10% Carbon
15% Carbon
20% Carbon
25% Carbon
33% Carbon
Carbon has good chemical resistance to corrosive environments. It exhibits good initial wear and rubbing or sliding contact characteristics, both dry and water applications. It is frequently used in piston rings to reduce cylinder wall wear by entrapping abrasive foreign particles in their relatively soft surfaces.
10% Carbon-Graphite
20% Carbon-Graphite
25% Carbon Graphite
These fillers are used both separately and together in PTFE compounds.
5% Calcium Fluoride
10% Calcium Fluoride
15% Calcium Fluoride
ALTERNATIVE TO GLASS FILL.
15% Glass Fiber, 5% Moly
20% Glass Fiber, 5% Moly
5% Carbon-Graphite
23% Glass Fiber, 2% Moly
25% Glass Fiber, 5% Moly
SEE ABOVE FOR INDIVIDUAL DEFINITIONS.
10% Glass Fiber, 10% Graphite
5% Glass Fiber, 5% Graphite
20% Glass Fiber, 5% Graphite
SEE ABOVE FOR INDIVIDUAL DEFINITIONS.
10% Glass Fiber, 5% Carbon
5% Glass Fiber, 10% Carbon
SEE ABOVE FOR INDIVIDUAL DEFINITIONS.
40% Bronze, 5% Moly
40% Bronze, 10% Moly
55% Bronze, 5% Moly
65% Bronze, 5% Moly
SEE ABOVE FOR INDIVIDUAL DEFINITIONS.
TYPICAL PHYSICAL PROPERTIES OF VIRGIN PTFE PRODUCTS
PTFE Material
Virgin
Virgin
"Super"
PTFE
Reprocessed
Virgin PTFE blended with:
Filler
None
None
None
Glass Fiber
Bronze
Graphite
Carbon
Glass,
MoS2
Filler Content By Weight
0%
0%
0%
25%
40%
10%
10%
23%, 2%
PROPERTIES
Specific Gravity
2.16
2.16
2.16
2.22
3.30
2.13
2.13
2.25
Tensile Strength @ Break (PSI)
3,000
4,500
1,500
2,500
2,300
2,700
2,800
2,500
Elongation @ Break
200%
800%
75%
50%
60%
60%
50%
50%
Shore D Hardness
54
54
56
63
65
57
62
64
Dielectric (Volts/Mil)
1300
2100
600
-
-
-
-
-
COMMON SPECIFICATIONS FOR Teflon ® AND PTFE PRODUCTS
