Copper Powders - Dimensionally Controlled Grades

RXL-RXM-RXH family of copper powders to provide low, medium and high growth bronze mixes respectively.

This family of copper powders is primarily designed for use in the manufacture of oil-impregnated sintered bronze bearings. They allow the bearing manufacturer to control the dimensional change of bronze during sintering. These copper grades may also be used for copper-iron P/M parts, for carbon brushes, for brazing formulations and for other uses where the selection is based on particle size and purity.

Five main grades of high quality copper powder are produced by an oxidation-reduction process that yields an irregular sponge-like particle. They are Resistox treated to resist oxidation during storage or use, and are available in controlled particle sizes, which give stepped dimensional changes in 1/2% intervals when sintered with tin to produce 90/10 bronze.

SCM Grades/Characteristics

150 RXM
Is the standard grade in this family. All other grades offer specific growth values relative to this grade

100 RXH
A -100 mesh (-149 µm) copper powder for highest growth in bronze mixes, i.e. 1.5% more than 150 RXM at 1530°F (832°C).

100 RXM
A -100 mesh (-149 µm) copper powder for high growth in bronze mixes, i.e. 1.0% more than 150 RXM at 1530°F (832°C).

150 RXH
A -150 mesh (-105 µm) copper powder for medium growth in bronze mixes, i.e. 0.5% more than 150 RXM at 1530°F (832°C).

150 RXM
A -150 mesh (-105 µm) copper powder designed to give nominal growth during sintering of 90/10 bronze mixes at 1530°F (832°C) when processed under normal production conditions.

150 RXL
A -150 mesh (-105 µm) copper powder for lowest growth in bronze mixes, i.e. 0.5% less than 150 RXM at 1530°F (832°C).