| Item | Spec. |
| Lead Bis(tetrafluoroborate)(as Pb), %≥ | 28 |
| Free fluoboric acid(HBF4),%≤ | 2 |
| Freee boric acid(H3BO3),% | 0.6-3 |
| Iron(Fe),%≤ | 0.1 |
| Silicon dioxide(SiO2),% ≤ | 1.0 |
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