90% White Metal Bearings
Performance Benefits: . Lowers Lub. Oil Consumption . Maintains specified fuel Consumption for longer service . Can be used against hardened as well as unhardened shaft . Protects shaft from extensive damage
Special Features: . Reduces operating cost Considerably. . Lined with Genuine Tin Base 90% While Metal . Retains Lubricants . Embeds dust and debris carried by the Lubricant and prevents scoring at high loads . Highly compatible to avoid seizure . Conforms to misperfection in Shaft geometry . High Strength to resist deformation by both steady & fluctuating loads . Resists corrosion by lubricants . Good thermal conductor, dissipates heat faster from the mating surface and runs cool . Excellent resistance to wear under conditions imposed in journal

Copper-Lead Bimetal Bearings & Bushes (CUPB)

  Copper Powder Metallurgy for Bearings:

. Copper readily forms a protective oxide film when heated in air.

. Copper readily forms a protective sulphide film with oils containing only traces
  of sulphur compounds.

. Copper has a high thermal conductivity for the dissipation of the frictional heat,
  thus reducing the surface temperature.

. Tin strengthens copper and hardens it sufficiently to be compatible
  with unhardened steel.

. The protective Organo-tin films formed with oils have a high
  desorption temperature

. Hence the copper-tin bronzes result in better bearings than the
  copper-zinc brasses.

. Copper alloys usually have a face-centered-cubic structure while the
  mating surface is usually a ferrous alloy with a body-centered-cubic structure.
  This difference contributes to the anti-seizure characteristics of copper
  alloys against iron alloys.


  Overlay Plated Copper-Lead Bearings for Heavy Duty Service:

. The Copper-Lead Bearings when plated have higher load carrying capacity
  than straight copper-lead alloys.

. These overlays are very soft and have excellent embeddability,
  conformability and corrosion resistance without impairing higher fatigue
  strength of inner copper-lead-tin alloy.

	Different Layers in typical overlay plated bearing are as under: . The steel backing to give the bearing   strength and regidity. . The copper-lead-tin intermediate, alloy lining   is permanently bonded to the steel back by   intering process. It is the lining alloy that will   stand up under extreme bearing loads. . A nickel plate or nickel barrier - just 2-3   microns thick - preventing the tin
from overplate alloy from being drawn into copper-lead alloy lining. . The lead-tin-copper plate that easily confirms to slight irregularities   in the crankshaft journals during engine run-in. . The pure tin flash plate which provides corrosion and rust resistance all over.