DP4B thrust washer, fibres and PTFE lined, BRONZE backing and self-lubricated, metric size 
Sintered PTFE and Polymer Fibres mixture and Bronze Powder  on Bronze Backing
PTFE / Polymer Fibres + Bronze + Bronze Backing

Features
Suitable for dry running, low coefficient of friction, lower wear, good sliding characteristics, the transfer film created can protect the mating metal surfaces, suitable for rotating and oscillating movement, high chemical resistance, low absorption of water and swelling. DP4B materieal improved the friction and much good wear resistance over the common DU bearing range under lubricated operation.

Structures

1. PTFE/Polymer fibres mixture thickness 0.01~0.03mm. Lead-free bearing layer provides an excellent initial transfer film, which effectively coats the mating surfaces of the bearing assembly, forming an oxide type solid lubricant film.
2. Sintered bronze powder thickness 0.20-0.35mm, provides max. thermal conductivity away from the bearing surface, also serves as a reservoir for the PTFE mixture.
3. Bronze backing, provides exceptional high load carrying capacity, excellent heat dissipation and very good corrosion resistance.

Physical and Mechanical Properties

Usage

Maximum Operating Temperature Tmax

280

°C

dry

good

Minimum Operating Temperature Tmin

-200

°C

oil lubricated

very good

Maximum Static Load Psta,max

250

N/mm2

grease lubricated

good

Maximum Dynamic Load Pdyn,max

140

N/mm2

water lubricated

fair

Maximum Sliding Speed V-dry

2.5

m/s

process fluid lubricated

good

Maximum Sliding Speed V-oil lubricated

5

m/s

Maximum PV Factor-dry

1

N/mm2 * m/s

Maximum PV Factor-oil lubricated

10

N/mm2 * m/s

Coefficient of friction f-dry

0.04-0.25

-

Coefficient of friction f-oil lubricated

0.02-0.08

-