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white metal constituents: Difference in constituents in both main and cross head bearings

general constituents of white metal are tin, antimony and copper. The tin content forms the matrix which is sufficiently soft to accommodate small change in alignment between journals and the bearing surfaces. Antimony forms cuboids which takes the load and transmit it into supporting matrix. They also have high resistance to wear. Copper holds the antimony in a evenly dispersed pattern.  Constituents of main and bottom end bearings- Tin 85-88%, Antimony 8-10%, copper
4-5%. constituents of cross-head bearings-Tin 88%, Antimony 8%, copper 4% and cadmium trace, as cross head bearing load is high.
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