The electrical conductivity of aluminium can be dramatically improved by the addtion of tightly controled amounts of boron to eliminate the undesirable effects of chromium,titanium,vanadium,and zirconium.Boron has also been ackowledges as an effective grain refiner for aluminium silicon alloys. Hebei Kingbol New Metals Co.,Ltd-professional manufacturer of aluminium master alloys. www.kblmetals.com kbl@kblmetals.com