By adding rhenium to tungsten it is possible to further enhance the caracteristics of pure tungsten. Tungsten-rhenium shows even higher strength, lower brittle-ductile transition temperature and increased ductility. 

Advantages compared to pure tungsten
 - lower transition temperature from brittle to ductile condition
 - no brittleness in recrystallized condition
 - higher recrystallization temperature
 - higher thermal stability  

LUMA Wire qualities, tungsten-rhenium
860
Is an alloy wire of tungsten and 3% rhenium (Re). In comparison with the pure tungsten wire it has superior hot strength, and vibration strength, a higher recrystallization temperature, greater specific resistance and greater tensile strength.
861
Is a wire of 860 standard quality which has passed the requisite tests to meet the demands for wire of a higher standard. 

Product datasheet