The use of potassium beryllium fluoroborate
(KBBF) once stalled the project and Chen Chuangtian, a CAS member along with Xu Zuyuan, a member of the Chinese Academy of Engineering turned to the Hong Kong University of Science and Technology for help.
DBF contains fluoroborate
ion in its structure, which is known to be more resistant to water than the chlorine found in DDAC.
plating also was noted as a substance once used in circuit board fabrication, and possibly not yet completely eliminated.
Because the oxygen that reacts with magnesium is found in the cores themselves, the researchers were able to limit the oxidation effects by adding 1% potassium fluoroborate
to certain sand mixtures.
Stevens DP, McLaughlin M J, Alston AM (1998b) Phytotoxicity of hydrogen fluroide and fluoroborate
and their uptake from solution culture by Avena sativa and Lycopersicon esculentum.