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1. Tungsten Alloys
       a. The most used specification is the old MIL-T-21014D. It is now under SAE but is essentially unchanged. It sets up four classes of materials based on tungsten content. Each class can be either the magnetic or non-magnetic version. Non-magnetic is defined as magnetic permeability being less than 1.05 mu. Class 1 is 90% tungsten; Class 2 is 92.5% tungsten; Class 3 is 95% tungsten and Class 4 has 97% tungsten. There are mechanical properties listed for each Class. The properties are derived from MPA bars
       b. Also used is AMS 7725C. It is similar to the 21014D specification but with lower density and mechanical properties
       c. Also, ASTM B787 is used and it is essentially identical to 21014D
2. Sintered tungsten
       a. Sintered tungsten has no active specifications. Almost all sintered tungsten is made from powder. It can be hot forged to shape for larger parts
       b. Thoriated and lanthanated version are available as well as standard doped versions.
3. Powders
       a. No common specification exists. Specify particle size,(distribution), particle size range and chemisrty. Also, add any other specifics necessary
4. Copper and Silver Tungsten Composites
       a. Most are specified by chemisrty or trade names
       b. ASTM B387 is a standard specification used
       c. Several company ones exist such as Hughes

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