Strontium is so far as known a semi-per-manent modifier for aluminium-silicon alloy

however the fading of Sr-modified Al-Si alloy was studied in laberatory and under industrial conditions.It has been found that the strontium fades considerably more quickly than expected in general. The lifetime of Sr-modified Al-Si alloy is about 60￣90 min

depending on the initial content of strontium in melt and the melt circumstances. The turbulence of melt and bubbling during degassing will make the strontium easily to faed

It appears that the strontium loss from the melt are primarily by oxidation that makes the Sr-content lowering dowm to a critical value 0.003%￣0.004%.The reason of such a qiuck fading would remain to be solved.