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 Plastic
| Test Conditions
PV 35 Load 0.90 Speed 0.25 |
|||||
|---|---|---|---|---|---|
| Rotating Sample | vs | Stationary Sample | µ Dynamic |
||
| RTP Product | Wear
Factor |
RTP Product | Wear
Factor |
||
|
PC Unfilled |
2525 | vs |
PA 6/6 Unfilled |
1237 | 0.64 |
|
PC Unfilled |
13661 | vs |
PA 6/6 30% Glass Fiber |
574 | 0.39 |
|
PC 30% Glass Fiber |
6326 | vs |
PC 30% Glass Fiber |
1739 | 0.31 |
|
PC 30% Glass Fiber |
258 | vs |
PA 6/6 30% Glass Fiber 15% PTFE |
716 | 0.29 |
|
PC 30% Glass Fiber 15% PTFE |
455 | vs |
PA 6/6 30% Glass Fiber 15% PTFE |
393 | 0.19 |
|
PC 30% Glass Fiber 15% PTFE |
1626 | vs |
PC Unfilled |
639 | 0.28 |
|
PC 30% Glass Fiber 15% PTFE |
198 | vs |
PA 6/12 30% Glass Fiber 15% PTFE |
348 | 0.18 |
|
PC 30% Glass Fiber 15% PTFE |
8 | vs |
PC 30% Carbon Fiber 15% PTFE |
58 | 0.11 |
|
PC 30% Glass Fiber 15% PTFE |
831 | vs |
PBT 30% Glass Fiber 15% PTFE |
1070 | 0.11 |
|
PC 30% Glass Fiber 15% PTFE |
4 | vs |
PA 6/12 30% Carbon Fiber 15% PTFE |
106 | 0.17 |
|
PC 30% Glass Fiber 15% PTFE |
2350 | vs |
PPS 30% Glass Fiber 15% PTFE |
573 | 0.28 |
|
PC 30% Glass Fiber 15% PTFE |
661 | vs |
PA 6/6 30% Glass Fiber |
494 | 0.23 |
|
PC 15% PTFE |
167 | vs |
PC 15% PTFE |
684 | 0.14 |
|
PC 10% Carbon Fiber 15% PTFE |
5165 | vs |
PC 10% Glass Fiber 15% PTFE |
260 | 0.25 |
|
PC 10% Carbon Fiber 15% PTFE |
3145 | vs |
PC 10% Carbon Fiber 15% PTFE |
203 | 0.32 |
|
PC 10% Carbon Fiber 15% PTFE |
23 | vs |
PA 6/12 30% Carbon Fiber 15% PTFE |
5 | 0.13 |
|
PC 10% Carbon Fiber 15% PTFE |
28 | vs |
PA 6/6 30% Carbon Fiber 15% PTFE |
31 | 0.15 |
|
PC 10% Carbon Fiber 15% PTFE |
217 | vs |
PA 6/12 30% Glass Fiber 15% PTFE |
78 | 0.16 |
- Thrust washer testing conducted per ASTM D 3702
- Wear Factor: (mm3/N m)10-8
- PV: KPa m/sec
- Load: N
- Speed: m/sec
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 |
|
|
Unfilled PC |
1118 | 0.60 | ||||
|
10% PTFE |
655 | 0.24 | 830 | 0.22 | 253 | 0.13 |
|
15% PTFE |
263 | 0.33 | 191 | 0.27 | 68 | 0.21 |
|
20% PTFE |
354 | 0.31 | 253 | 0.24 | 117 | 0.18 |
|
10% PTFE 2% Silicone |
995 | 0.35 | 326 | 0.26 | 117 | 0.18 |
|
30% Glass Fiber 15% PTFE |
177 | 0.35 | 93 | 0.53 | 1007 | 0.27 |
|
30% Carbon Fiber 15% PTFE |
285 | 0.30 | 205 | 0.39 | 72 | 0.36 |
|
10% Aramid Fiber 10% PTFE |
985 | 0.38 | 12100 | 0.29 | 14733 | 0.31 |
- 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.
No information supplied by RTP Company constitutes a warranty regarding product performance or use. Any information regarding performance or use is only offered as suggestion for investigation for use, based upon RTP Company or other customer experience. RTP Company makes no warranties, expressed or implied, concerning the suitability or fitness of any of its products for any particular purpose. It is the responsibility of the customer to determine that the product is safe, lawful and technically suitable for the intended use. The disclosure of information herein is not a license to operate under, or a recommendation to infringe any patents.
