Plastic Bearings

Plastic Bearings

The inner ring and outer ring of plastic bearings are made of POM, PTFE, PVDF or PEEK through a precision machining technology. The rolling body and the retainer can be made of Si3N4, ZrO2, glass, stainless steel or other materials. Plastic bearings can be applied in the environment which require a precision, corrosion-resistance and oil-free lubrication.

Basic properties of staple engineer plastic

material HDPE PP POM PA6 PA66 PBT GF30 PVDF PPS PTFE PEEK PI
Long time working temp(℃) 90 100 110 100 100 120 150 230 260 260 300
Density  0.96 0.91 1.42 1.13 1.14 1.53 1.77 1.35 2.18 1.32 1.35
Tensile strength at yield (Mpo)s 25 30 70 85 80   50 75 25 95  
Tensile strength at break (Mpo)​R 35         13.5 4.6       116
Ball indentation hardness (Mpa)Hk 50 80 170 160 170 190 80 190 30    
Impact strength

(KJ/m2)an

 None None None None None 60 None 50 None None 75
Sliding friction coefficient 0.29 0.3 0.34 0.38-0.45 0.35-0.42 0.24 0.3   0.08-0.1 0.3-0.38 0.3-0.38
Side wear(/Km)   11 4.6 0.23 0.9       21 0.3-0.38  
vicat softening temp(℃) 130 165 175 220 260 225 172 280 327 343  
Glass Transition Temperature(℃)DSC/Tg -95 -18 -60 60 72 60 -18 90 -20 143  
Heat Deflection Temperature, HDT/B(℃) 42-49 65 124 75 100 210 95 110 55 140 368
Heat Deflection Temperature, HDT/A(℃) 70-85 105 170 190 >200 225 140   121 182  
Max working temp, short time(℃) 90 140 150 160 170 200 150 260 260 300 350
Coef of linear expansion(10-5//K) 13-15 17 10 8 8 3.5 13 5 12 5 4.9
Dielectric constant at 1Mhz(106Hz) 2.4 2.25 3.7 3.7-7 3.6-5 3.8 8   2.1 3.2-3.3 3.1
Volume resistivity -cm >1015 >1014 >1014 >1013 >1012 >1013 >1014 >1013 >1016 >1016 >1017
Anti-hot water and aikali for washing + + - (+) (+) - + + + + (+)
Flammability UL94 HB HB HB HB HB HB VO VO VO VO VO
Anti-weathering - - - - - - + - + - (+)

+ = resitant     (+) =partly resistant     - =none-resistant     none =none break

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