Wear factor (K) is an indication of a materials resistance to wear as a function of the volume of material lost, force (load) and velocity at the wear interface and time. It is often determined using a “thrust washer” wear testing apparatus per ASTM D3702 in which a molded plastic specimen is rotated against a substrate thrust washer under set pressure and velocity conditions.
A wear factor is calculated with the equation W=K*F*V*T. In this equation W is wear volume (mm3), K is wear factor (mm3/N m)10-8, F is force (N), V is velocity (m/sec), and T is elapsed time (sec).
A material with a lower wear factor (K) has greater resistance to wear and these values are useful for material comparison purposes.
[ View wear data in english units | Return to wear data resin system list ]
Plastic vs Steel
RTP Product | Tested vs. Steel (1018 C) | |||||
---|---|---|---|---|---|---|
PV 70
Load 1.80 Speed 0.25 |
PV 175
Load 2.25 Speed 0.50 |
PV 350
Load 9.00 Speed 0.25 |
||||
Wear Factor |
µ Dynamic |
Wear Factor |
µ Dynamic |
Wear Factor |
µ Dynamic |
|
30% Glass Fiber 15% PTFE UL94 V-0 |
103 | 0.44 | 189 | 0.41 | 358 | 0.34 |
30% Carbon Fiber 15% PTFE |
84 | 0.33 | 34 | 0.50 | 48 | 0.59 |
15% Aramid Fiber 15% PTFE |
24 | 0.25 | 38 | 0.22 | 22 | 0.18 |
- Thrust washer testing conducted per ASTM D 3702
- Wear Factor: (mm3/N m)10-8
- PV: KPa m/sec
- Load: N
- Speed: m/sec
Comparing competitive data note
RTP Company reports Wear Factors per unit Force (KF) with units of (mm3/N m)10-8. This is the industry standard way to calculate and report Wear Factor. Some suppliers report Wear Factors per unit Pressure (KP) with units of (mm3/Pa m)10-11. This value is arrived at by dividing the KF by the contact surface of the test specimen 0.00023 or 2.3-4 m2. As result of this reporting discrepency, RTP Company’s Wear Factor values appear to be significantly higher. For example a KP of 3 (mm3/Pa m)10-11 would be equal to KF of 3/0.00023 = 13 (mm3/N m)10-8.
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