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Refractory Materials - Composites and Pure Metals

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Material Description Industry Specifications Composition Density Minimum Hardness Electrical Conductivity
    Nominal lb/cu.in up to 1” Dia %IACS
Cu-Tungsten (55%) RWMA Class 10 Cu, 55% W 0.455 RB 72 45 Min

Specified for electrode and electrode inserts for many flash and butt welding applications. This grade is specified when higher electrical and thermal conductivity are required.
Cu-Tungsten (75%) RWMA Class 11
ASTM B702		 Cu, 75% W 0.534 RB 94 40 Min

For projection welding electrodes where pressures are moderately high. This grade is the standard for many copper tungsten resistance welding applications.
Cu-Tungsten (80 %) RWMA Class 12
ASTM B702		 Cu,80% W 0.563 RB 98 35 Min

Slightly higher tungsten content results in higher hardness and strength when forces are relatively high. Strength is gained with a slight decrease in electrical and thermal properties.
Tungsten RWMA Class 13
ASTM B777		 99.9% min
(varies by grade)		 0.696 RA 69 30 Min

High density, very high melting point(3410 deg C,), and excellent rigidity are combined in this material. Coupled with a very low coefficient of thermal expansion, tungsten is utilized in a variety of applications including incandescent lighting filaments, welding electrodes, balancing weights, and armor piecing projectiles.
Molybdenum RWMA Class 14
ASTM B387		 99.9% min 0.368 RB 85 30 Min

Molybdenum is suited for high temperature applications with good corrosion resistance, workability, and a low coefficient of thermal expansion.

                    


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