DUB Material Specifications    DUB cylindrical bushings				DUB bush, PTFE lined, BRONZE backing, self lubricating dry bearings   Sintered PTFE and Bronze on Bronze Backing (Maintenance-free Material) PTFE / Fibre + 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 surface, suitable for rotary and oscillating movement. Very high chemical resistance, low absorption of water and swelling, also performs very good lubrication feature, the bronze backing provides the improved corrosion resistance comparing with SBU bearings. Structures 1. PTFE/fibre mixture thickness 0.01~0.03mm, 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/Fibre mixture. 3. Bronze backing, provides exceptionally high load carrying capacity, excellent heat dissipation and very good corrosion resistance. Typical Applications This material meets the demanding criteria for long life and trouble-free performance with or without lubricant, of high safety factor even.  The bronze backing provides a high corrosion resistance, anti magnetic properties and a good thermal conductivity, The bearings are particularly appropriate for high temperature environment where no oil is efficient and the machine must be under successive long period working condition. The typical applications covered Steel metallurgy industry such as bushes for roller grooves of successive casting machines, cement grouting pumps and screw conveyers for cement and so on. Technical Data Physical and Mechanical Properties Usage Thermal Conductivity λ 60 W/mK dry very good Maximum Operating Temperature Tmax 280 °C oil lubricated good Minimum Operating Temperature Tmin -200 °C grease lubricated fair Compressive Yield Strength σc 300 N/mm2 water lubricated good Maximum Static Load Psta,max 140 N/mm2 process fluid lubricated fair Maximum Dynamic Load Pdyn,max 140 N/mm2 　 Maximum Sliding Speed V-dry 2.5 m/s Maximum PV Factor-dry, continuous operation 1.8 N/mm2 * m/s Maximum PV Factor-dry, intermittent operation 3.5 N/mm2 * m/s Coefficient of friction f-dry 0.02-0.25 　 　 Coefficient of friction f-oil lubricated 0.02-0.12 　 　   DUB standard cylindrical bushings     Other Standard DU-B Shapes
DU-B bearing & DUB bushing (SF-1B series)         BB3540DUB   4025DUB   4530DUB   5030DUB                     Gear Pump Bush   BB5540DUB | 55x60x40 mm   BB6570145.5DUB | 65x70x14.5 mm   DU-B bearing | 25x28x30 mm                     DU-B bush | 19.5x22.35x16 mm   1212DUB | 12 x 14 x 12 mm   DUB bearing | 22.35x25.55x31.75 mm   1820DUB | 18x20x20 mm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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