Hi Hem,

for GLS filaments and FL electrodes the K content typically amounts to 65 - 75 µg/g, for halogen lamp filaments 70 - 90 µg/g. The recrystallization temperature depends on the amount of deformation, the TMT (deformtion temperatures, heat treatment temperatures) and the potassium bubble distribution. Typically, the onset temperature (annealing time= 15 min., heating rate= 3 °C/s) amounts to 1700°C up  to 2100°C (the higher the degree of deformation (the thinner the wire), the higher is the recrystallization temperature).

All the best for your work, Gerhard

Thank you Mr. Gerhard.

Can you please elaborate by which technique I can find the exact composition of the Tu Wire  of dia. 50µm and in which the K content is in few ppm ? I mean the accuracy level of the instrument should be high, so that we can see a significant difference in the cmposition of different Tu grades in term sof K content. Is that possible.