 |
|
|
|
| |
Plastic materials intended for bearing applicationsm with or without lubrication must be designed with
consideration of the individual physical characteristics
and operating conditions of each actual requirement.
The design data below is provided as an introduction
to plastic bearing design. It is suggested that actual
field testing be conducted under the expected environmental
conditions.
|
PV Value
The frictional build-up of heat is a major consideration in the design of plastic bearings. The two significant factors that affect heat generation are unit pressure (P) and surface velocity (V). Pressure Velocity (PV) therefore, is the product of unit pressure and surface velocity.
Surface velocity for sleeve-type bearings can be computed using the following:
V = .262 x rpm x D
Rpm represents shaft revolutions per minute and D isthe shaft diameter in inches. Pressure can be computed for flat bearing units by dividing the total load in pounds by the contact area expressed in square inches:
P = Total Load / Contact Area
For sleeve bearings, the total load is divided by theprojected area of the bearing surface (bearing I.D. in inches x bearing length in inches). Once pressure and surface velocity are known, PV can be determined by using the following:
PV = P x V
To determine the Maximum Limiting PV of different plastic materials, see the chart below. There you will find PV values for over 50 different materials. |
Advanced Industrial Guide to Plane Bearings |
|
Max. P |
Max V |
Max PV |
Service |
|
Bearing Material |
Static |
No Load |
P x V |
Temp. |
Characteristics / Attributes |
|
psi |
SFM dry |
Dry |
Cont. F |
|
SINTIMID T-BG / FILLED POLYIMIDE |
6,000 |
1,000 |
300,000 |
550 |
Highest PV / Very High Temp / Lowest Friction |
SINTIMID T -BGF / FILLED POLYIMIDE |
6,600 |
500 |
250,000 |
550 |
High PV / High Temp / Chemical Resistant |
15% GRAPHITE FILLED POLYIMIDE |
5,000 |
1,000 |
250,000 |
550 |
High PV / High Temp / Low Friction / Chemical Resistant |
BEARING GRADE PEEK 5025 |
6,000 |
600 |
100,000 |
480 |
High PV / High Temp / Chemical Resistant / Thermally Stable |
SINTAMID T POLYIMIDE |
3,000 |
750 |
100,000 |
550 |
High PV / High Temp / Low Friction / Chemical Resistant |
15% GRAPHITE 10% TFE POLYIMIDE |
4,500 |
750 |
100,000 |
550 |
High PV / High Temp / Low Friction / Chemical Resistant |
TORLON 4301 |
1,000 |
900 |
50,000 |
500 |
High Temp / High Strength / Low Friction / Graphite Filled |
CELAZOLE / PBI |
1,000 |
150 |
50,000 |
650 |
Highest Temp / Chemical Resistant / Polybenzimidizole |
CARBON FIBER FILLED PEEK |
6,000 |
600 |
50,000 |
480 |
High PV / High Temp / Thermally Stable / Conductive |
ULTRALINER J |
10,000 |
400 |
20,000 |
500 |
Filled PTFE w/ Screen Reinforcement / Bondable |
PACIFIC - LINEAR MOTION BEARINGS |
5,000 |
400 |
20,000 |
500 |
Standard Sizes U.S. & Metric / Self Lubricating / High Load |
FCJ BEARING |
5,000 |
400 |
20,000 |
320 |
Rulon Lined Glass / Epoxy Shell / High P |
HYDEX 4101L |
1,000 |
200 |
15,000 |
245 |
PTFE Filled PBT / FDA / USDA / Low Friction |
HYDLAR FGA |
1,000 |
100 |
12,400 |
180 |
PTFE Filled Acetal / Low Friction / FDA / USDA |
RULON W2 |
1,000 |
400 |
10,000 |
500 |
Filled PTFE / Water Applications / High V / Chemical Resistant |
RULON LR |
1,000 |
400 |
10,000 |
500 |
Filled PTFE / Good Strength / High V / Chemical Resistant |
RULON K / FLUOROLOY K |
1,000 |
400 |
10,000 |
500 |
Filled PTFE / Stability / Seals / High V / Chemical Resistant |
RULON J |
750 |
400 |
10,000 |
500 |
Filled PTFE / Low Friction / Non Abrasive / Chemical Resistant |
RULON DC7035 |
1,000 |
400 |
10,000 |
500 |
Filled PTFE / Conductive / High V / Chemical Resistant |
|
RULON 641 |
1,000 |
400 |
10,000 |
500 |
Filled PTFE / FDA / USDA / High V / Chemical Resistant |
RULON 488 |
1,000 |
400 |
10,000 |
500 |
Filled PTFE / Economical / High V / Chemical Resistant |
RULON 142 |
1,000 |
400 |
10,000 |
500 |
Filled PTFE / Bondable / Machine Tool Ways / High Load |
VEKTON 6PALM |
400 |
100 |
10,000 |
200 |
High Impact / Oil Lubricant Filled Nylon Type 6 / Low Friction |
FLUOROGOLD |
1,000 |
400 |
10,000 |
500 |
Filled PTFE / Lowest Friction / High V / Chemical Resistant |
DELRIN AF |
1,000 |
100 |
10,000 |
180 |
PTFE Filled Acetal / Low Friction / Brown / Good Machinability |
CJ BEARING |
15,000 |
150 |
10,000 |
320 |
PTFE Nomex-Lined Glass / Epoxy Shell / High Load |
ENSIFIDE BG / PPS |
1,500 |
400 |
10,000 |
425 |
High Strength / Rigidity / Excellent Chemical Resistance |
ENSITAL HPV13 |
1,000 |
100 |
8,750 |
180 |
Filled Acetal / Low Moisture Absorption / Wear Resistant |
HYDLAR ZF |
1,500 |
100 |
8,000 |
230 |
Kevlar - Aramid Fiber Filled Nylon / Good Wear / FDA |
RULON 988 / FLUOROLOY A |
1,000 |
400 |
7,500 |
500 |
Filled PTFE / Stability / Strength / High V / Low Friction |
FLUOROSINT 207 |
750 |
400 |
7,500 |
500 |
Filled PTFE / Low Friction / High Temp. / FDA / Thermal Stability |
HYDEX 4101 |
1,000 |
100 |
6,000 |
245 |
PBT / Chemical Resistant / Economical / Good Wear |
VEKTON 6PAL, 6PAG, |
350 |
100 |
5,500 |
200 |
Oil & MoS2 Filled Nylon Type 6 / Low Friction / Good Wear |
VEKTON 6XAU |
300 |
100 |
5,500 |
260 |
Oil & MoS2 Filled Nylon Type 6 / High Temp / Good Wear |
MICARTA |
27,500 |
15 |
5,000 |
250 |
Thermo-set / Rigid / High Strength / Electrical Insulator |
FLUOROSINT 500 |
750 |
400 |
5,000 |
500 |
Syn. Mica Filled PTFE / Most Thermally Stable in PTFE Family |
PET Ertalyte |
1,000 |
100 |
5,000 |
210 |
PET / Economical / Good Wear / FDA / USDA / Machinable |
25% GLASS FILLED PTFE |
1,000 |
350 |
5,000 |
550 |
Filled PTFE / High V / High Temp / Chemical Resistant |
25% CARBON FILLED PTFE |
1,000 |
400 |
4,500 |
500 |
Filled PTFE / Low Friction / Conductive / Chemical Resistant |
DELRIN / HOMOPOLYMER |
1,000 |
50 |
3,500 |
180 |
Acetal / Economical / Good Wear / FDA / USDA / Machinable |
NYLON ST801 |
300 |
40 |
3,000 |
200 |
Super Tough Nylon / High Strength / High Impact Strength |
VEKTON 6PAM, 6PA |
300 |
60 |
3,000 |
200 |
MoS2 Filled Nylon Type 6 / Economical / High Strength |
GLASS FILLED NYLON |
350 |
40 |
3,000 |
225 |
Economical / Good Wear / High Impact Strength / High Strength |
|
DELRIN CL500 |
1,000 |
50 |
3,000 |
122 |
Excellent Machinability / Lubricated Acetal / Low Friction |
NYLON 66 |
300 |
60 |
2,700 |
210 |
Economical / Good Wear Characteristics/ High Impact Strength |
OIL FILLED UHMW |
800 |
75 |
1,500 |
180 |
Low Friction / High Abrasion Resistance / FDA / Chemical Res. |
GLASS FILLED UHMW |
1,000 |
50 |
1,500 |
180 |
Low Friction / Highest Abrasion Resistance / Economical |
15% GRAPHITE FILLED PTFE |
400 |
100 |
1,500 |
500 |
Filled PTFE / Low Friction / Economical / Chemical Resistance |
UHMW |
800 |
50 |
1,000 |
180 |
Economical / High Abrasion Resistance / Low Friction / FDA |
PTFE |
50 |
400 |
1,000 |
550 |
High Chemical Resistance / High Temp / Low Heat Transfer |
|
| |
|
|
|
