Composites Typical Properties
Additional values are available on this table 
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| Mi-Tech | Nominal Composition % Weight | Rockwell Hardness | Electrical Conductivity % IACS | Ultimate Tensile Strength PSI | Cross Breaking Strength PSI | Density g/cc | Typical Resistance Welding Applications |
|---|---|---|---|---|---|---|---|
| CW55 | 55% Tungsten 45% Copper | 79 B | 55 | 63,000 | 110,000 | 12.50 | Flash and butt welding die inserts requiring high electrical and thermal conductivity. Electrode facings for the welding of stainless steel. |
| CW68 | 68% Tungsten 32% Copper | 88 B | 52 | 75,000 | 130,000 | 13.93 | Flash and butt welding die inserts requiring high electrical and thermal conductivity. Electrode facings for the welding of stainless steel. |
| CW70E | 68% Tungsten 32% Copper | 88 B | 52 | 75,000 | 130,000 | 13.93 | Flash and butt welding die inserts requiring high electrical and thermal conductivity. Electrode facings for the welding of stainless steel. |
| CW70 | 70% Tungsten 30% Copper | 90 B | 50 | 85,000 | 140,000 | 14.18 | Light duty projection welding dies where weld pressures are medium to light. |
| CW75 | 75% Tungsten 25% Copper | 94 B | 48 | 90,000 | 150,000 | 14.70 | Used for facing and inserts for flash and butt welding dies, projection welding electrodes, seam welding bearing inserts, facings for electro-forming and electro-forging dies. Often used for EDM electrodes for greater wear ratios. |
| CW78 | 78% Tungsten 22% Copper | 96 B | 46 | 94,000 | 160,000 | 15.12 | Used where a slightly harder material is required for the same applications as CW75. |
| CW80 | 80% Tungsten 20% Copper | 98 B | 44 | 96,000 | 170,000 | 15.56 | Heavy duty projection welding electrodes, die facing for electro-forming and electro-forging, also facings for upsetting of rivets & studs. |
| SW50 | 50% Tungsten 50% Silver | 70 B | 65 | 13.4 | Used for arcing contacts and plates, arc runners, and current carrying members | ||
| SW65 | 65% Tungsten 35% Silver | 87 B | 53 | 14.5 | Used for arcing contacts and plates, arc runners, and current carrying members | ||
| SW74 | 74% Tungsten 26% Silver | 90 B | 47 | 15.5 | Used for arcing contacts and plates, arc runners, and current carrying members | ||
| TC50 | 50% Tungsten-Carbide 50% Copper | 94 B | 47 | 70,000 | 140,000 | 11.27 | Light duty projection welding dies where pressures are not extreme but where abrasion may be encountered. |
| TC56 | 56% Tungsten-Carbide 44% Copper | 99 B | 42 | 75,000 | 160,000 | 11.67 | Where abrasion is encountered for heavy duty projection welding electrode and die facings for electro-forming and electro-forging. |
| TC70 | 70% Tungsten-Carbide 30% Copper | 37 C | 30 | 85,000 | 180,000 | 12.60 | An extremely hard material highly resistant to wear, for electro-forging and upsetting. Impractical to machine and should be ground. |
